From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E7679155C87; Tue, 17 Sep 2024 08:50:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563045; cv=none; b=nCtyfCHElRmn3CT4GHmypmVkkZhhdyPqHpHFANo1oeLL5QNIVK0zNJq7St6hSayFH+CIzeW8Sn0p8bAU7NH2J0qu3BJXVOWDa4kj4+mL1cpjDiyuN5yIXgqpA5Lir32AU1X+3G0hxejeDt+UxecfnwiBw0mcj4llrZ869aA+WKc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563045; c=relaxed/simple; bh=Du2SNnKFgCVIlfZ2+m1F3OX3IIVtJLXzSWzXf6k0IkU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mXX2h1XyIKvWGI7UqvTx/n3gTD2lhwXRb0boK1DkttZtyGLx2b5mDLUsWVUjB7LFEr6iAhUBpZvFw5sVqFegyN1zGeazAqRNSZrzUePk3k6ff+n0kwZ2FIh98TxHsVzzoIHisXDvmrTQ5l5AIiKqqCkYiVP9LNtkgnZmdhpaPRw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aYrpNOHq; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aYrpNOHq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D79BEC4CEC5; Tue, 17 Sep 2024 08:50:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563044; bh=Du2SNnKFgCVIlfZ2+m1F3OX3IIVtJLXzSWzXf6k0IkU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aYrpNOHqND8Ftwo5xVQr6eHLlwUeSmGS0iTNwcnKCz/isrsIJRnzJqVHn+EAQIb11 9w9WwRuPbIMoBaJpjNNmA4HF3hLhjhXS0vsvpxTkgg9EpeNaIKpCEPSkNp1ZCFVVL6 wdb/puXzljRcRi7G5fNi+XUpUr51NJXxkieKJA1+XFCamYdO351MAYVMqtLWnMeAta qiUOVQo5th2KaPpvkxMSQP+RoJt+GbNhtnTIBH+HN5KvpAP9TIFoTN8Q0NYOREqM57 QmwxQwXoLN0kDVsnEPN0WlF1yG0vhjgJ5706mNOmtwSwIf7F3lJA838mq3uspY9uU7 ofwNZPyQnZOHA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 01/14] uprobe: Add data pointer to consumer handlers Date: Tue, 17 Sep 2024 10:50:11 +0200 Message-ID: <20240917085024.765883-2-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding data pointer to both entry and exit consumer handlers and all its users. The functionality itself is coming in following change. Signed-off-by: Jiri Olsa --- include/linux/uprobes.h | 4 ++-- kernel/trace/bpf_trace.c | 6 ++++-- kernel/trace/trace_uprobe.c | 12 ++++++++---- .../testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 2 +- 4 files changed, 15 insertions(+), 9 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 2b294bf1881f..bb265a632b91 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -37,10 +37,10 @@ struct uprobe_consumer { * for the current process. If filter() is omitted or returns true, * UPROBE_HANDLER_REMOVE is effectively ignored. */ - int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); + int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs, __u64 = *data); int (*ret_handler)(struct uprobe_consumer *self, unsigned long func, - struct pt_regs *regs); + struct pt_regs *regs, __u64 *data); bool (*filter)(struct uprobe_consumer *self, struct mm_struct *mm); =20 struct list_head cons_node; diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index ac0a01cc8634..de241503c8fb 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3332,7 +3332,8 @@ uprobe_multi_link_filter(struct uprobe_consumer *con,= struct mm_struct *mm) } =20 static int -uprobe_multi_link_handler(struct uprobe_consumer *con, struct pt_regs *reg= s) +uprobe_multi_link_handler(struct uprobe_consumer *con, struct pt_regs *reg= s, + __u64 *data) { struct bpf_uprobe *uprobe; =20 @@ -3341,7 +3342,8 @@ uprobe_multi_link_handler(struct uprobe_consumer *con= , struct pt_regs *regs) } =20 static int -uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long f= unc, struct pt_regs *regs) +uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long f= unc, struct pt_regs *regs, + __u64 *data) { struct bpf_uprobe *uprobe; =20 diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index f7443e996b1b..11103dde897b 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -88,9 +88,11 @@ static struct trace_uprobe *to_trace_uprobe(struct dyn_e= vent *ev) static int register_uprobe_event(struct trace_uprobe *tu); static int unregister_uprobe_event(struct trace_uprobe *tu); =20 -static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *= regs); +static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *= regs, + __u64 *data); static int uretprobe_dispatcher(struct uprobe_consumer *con, - unsigned long func, struct pt_regs *regs); + unsigned long func, struct pt_regs *regs, + __u64 *data); =20 #ifdef CONFIG_STACK_GROWSUP static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) @@ -1500,7 +1502,8 @@ trace_uprobe_register(struct trace_event_call *event,= enum trace_reg type, } } =20 -static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *= regs) +static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *= regs, + __u64 *data) { struct trace_uprobe *tu; struct uprobe_dispatch_data udd; @@ -1530,7 +1533,8 @@ static int uprobe_dispatcher(struct uprobe_consumer *= con, struct pt_regs *regs) } =20 static int uretprobe_dispatcher(struct uprobe_consumer *con, - unsigned long func, struct pt_regs *regs) + unsigned long func, struct pt_regs *regs, + __u64 *data) { struct trace_uprobe *tu; struct uprobe_dispatch_data udd; diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/= testing/selftests/bpf/bpf_testmod/bpf_testmod.c index 1fc16657cf42..e91ff5b285f0 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c @@ -421,7 +421,7 @@ static struct bin_attribute bin_attr_bpf_testmod_file _= _ro_after_init =3D { =20 static int uprobe_ret_handler(struct uprobe_consumer *self, unsigned long func, - struct pt_regs *regs) + struct pt_regs *regs, __u64 *data) =20 { regs->ax =3D 0x12345678deadbeef; --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37943150990; 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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mFfiV1Km" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 842C7C4CEC6; Tue, 17 Sep 2024 08:50:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563057; bh=JR4+PChEiP5sPKx8Jrd1JZbjHK18Fun69oiYo6JlQAg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mFfiV1KmeuR9oE8aESJwmV6d8u765QDEM4WZbbGJF/Z34HjwwL+V7KNu54jEbBSSC nafZXsaIYONlnUEu44gfBSDyYXx6KA68I6QoV0t6S5baQffqQelCZodZqj5+u8O/TQ v2JGDgqr9HNEZLjwwvL9gT9KVBwD0OYM6lv1HJmsEbcqvN4nyCTYIDy8cp9/eIr9UP kKhQ2Ylig6t2dE9oqNdy0kBVfaYXxiog5O7397w1b+bvB/kyUaC0xjH/2/GTP5/p6V O55hASNuN3nt6xNetTBBhwUU7FxC8kzuM23NtUznXfHZtuqi8HwNMpTjN+k1B1Bm3E aCWWKtxUfHJHw== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 02/14] uprobe: Add support for session consumer Date: Tue, 17 Sep 2024 10:50:12 +0200 Message-ID: <20240917085024.765883-3-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This change allows the uprobe consumer to behave as session which means that 'handler' and 'ret_handler' callbacks are connected in a way that allows to: - control execution of 'ret_handler' from 'handler' callback - share data between 'handler' and 'ret_handler' callbacks The session concept fits to our common use case where we do filtering on entry uprobe and based on the result we decide to run the return uprobe (or not). It's also convenient to share the data between session callbacks. To achive this we are adding new return values the uprobe consumer can return from 'handler' callback: UPROBE_HANDLER_IGNORE - Ignore 'ret_handler' callback for this consumer. UPROBE_HANDLER_IWANTMYCOOKIE - Store cookie and pass it to 'ret_handler' (if defined). We store shared data in the return_consumer object array as part of the return_instance object. This way the handle_uretprobe_chain can find related return_consumer and its shared data. We also store entry handler return value, for cases when there are multiple consumers on single uprobe and some of them are ignored and some of them not, in which case the return probe gets installed and we need to have a way to find out which consumer needs to be ignored. The tricky part is when consumer is registered 'after' the uprobe entry handler is hit. In such case this consumer's 'ret_handler' gets executed as well, but it won't have the proper data pointer set, so we can filter it out. Suggested-by: Oleg Nesterov Signed-off-by: Jiri Olsa --- include/linux/uprobes.h | 25 ++++++- kernel/events/uprobes.c | 150 ++++++++++++++++++++++++++++++++-------- 2 files changed, 144 insertions(+), 31 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index bb265a632b91..751b1dd4abe9 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -23,8 +23,20 @@ struct inode; struct notifier_block; struct page; =20 +/* + * Allowed return values from uprobe consumer's handler callback + * with following meaning: + * + * UPROBE_HANDLER_REMOVE + * - Remove the uprobe breakpoint from current->mm. + * UPROBE_HANDLER_IGNORE + * - Ignore ret_handler callback for this consumer. + * UPROBE_HANDLER_IWANTMYCOOKIE + * - Store cookie and pass it to ret_handler (if defined). + */ #define UPROBE_HANDLER_REMOVE 1 -#define UPROBE_HANDLER_MASK 1 +#define UPROBE_HANDLER_IGNORE 2 +#define UPROBE_HANDLER_IWANTMYCOOKIE 3 =20 #define MAX_URETPROBE_DEPTH 64 =20 @@ -44,6 +56,8 @@ struct uprobe_consumer { bool (*filter)(struct uprobe_consumer *self, struct mm_struct *mm); =20 struct list_head cons_node; + + __u64 id; /* set when uprobe_consumer is registered */ }; =20 #ifdef CONFIG_UPROBES @@ -83,14 +97,23 @@ struct uprobe_task { unsigned int depth; }; =20 +struct return_consumer { + __u64 cookie; + __u64 id; + int rc; +}; + struct return_instance { struct uprobe *uprobe; unsigned long func; unsigned long stack; /* stack pointer */ unsigned long orig_ret_vaddr; /* original return address */ bool chained; /* true, if instance is nested */ + int consumers_cnt; =20 struct return_instance *next; /* keep as stack */ + + struct return_consumer consumers[] __counted_by(consumers_cnt); }; =20 enum rp_check { diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 4b7e590dc428..5d376cc9a983 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -65,7 +65,7 @@ struct uprobe { struct rcu_head rcu; loff_t offset; loff_t ref_ctr_offset; - unsigned long flags; + unsigned long flags; /* "unsigned long" so bitops work */ =20 /* * The generic code assumes that it has two members of unknown type @@ -826,8 +826,11 @@ static struct uprobe *alloc_uprobe(struct inode *inode= , loff_t offset, =20 static void consumer_add(struct uprobe *uprobe, struct uprobe_consumer *uc) { + static atomic64_t id; + down_write(&uprobe->consumer_rwsem); list_add_rcu(&uc->cons_node, &uprobe->consumers); + uc->id =3D (__u64) atomic64_inc_return(&id); up_write(&uprobe->consumer_rwsem); } =20 @@ -1786,6 +1789,34 @@ static struct uprobe_task *get_utask(void) return current->utask; } =20 +static size_t ri_size(int consumers_cnt) +{ + struct return_instance *ri; + + return sizeof(*ri) + sizeof(ri->consumers[0]) * consumers_cnt; +} + +#define DEF_CNT 4 + +static struct return_instance *alloc_return_instance(void) +{ + struct return_instance *ri; + + ri =3D kzalloc(ri_size(DEF_CNT), GFP_KERNEL); + if (!ri) + return ZERO_SIZE_PTR; + + ri->consumers_cnt =3D DEF_CNT; + return ri; +} + +static struct return_instance *dup_return_instance(struct return_instance = *old) +{ + size_t size =3D ri_size(old->consumers_cnt); + + return kmemdup(old, size, GFP_KERNEL); +} + static int dup_utask(struct task_struct *t, struct uprobe_task *o_utask) { struct uprobe_task *n_utask; @@ -1798,11 +1829,10 @@ static int dup_utask(struct task_struct *t, struct = uprobe_task *o_utask) =20 p =3D &n_utask->return_instances; for (o =3D o_utask->return_instances; o; o =3D o->next) { - n =3D kmalloc(sizeof(struct return_instance), GFP_KERNEL); + n =3D dup_return_instance(o); if (!n) return -ENOMEM; =20 - *n =3D *o; /* * uprobe's refcnt has to be positive at this point, kept by * utask->return_instances items; return_instances can't be @@ -1895,39 +1925,35 @@ static void cleanup_return_instances(struct uprobe_= task *utask, bool chained, utask->return_instances =3D ri; } =20 -static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs) +static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs, + struct return_instance *ri) { - struct return_instance *ri; struct uprobe_task *utask; unsigned long orig_ret_vaddr, trampoline_vaddr; bool chained; =20 if (!get_xol_area()) - return; + goto free; =20 utask =3D get_utask(); if (!utask) - return; + goto free; =20 if (utask->depth >=3D MAX_URETPROBE_DEPTH) { printk_ratelimited(KERN_INFO "uprobe: omit uretprobe due to" " nestedness limit pid/tgid=3D%d/%d\n", current->pid, current->tgid); - return; + goto free; } =20 /* we need to bump refcount to store uprobe in utask */ if (!try_get_uprobe(uprobe)) - return; - - ri =3D kmalloc(sizeof(struct return_instance), GFP_KERNEL); - if (!ri) - goto fail; + goto free; =20 trampoline_vaddr =3D uprobe_get_trampoline_vaddr(); orig_ret_vaddr =3D arch_uretprobe_hijack_return_addr(trampoline_vaddr, re= gs); if (orig_ret_vaddr =3D=3D -1) - goto fail; + goto put; =20 /* drop the entries invalidated by longjmp() */ chained =3D (orig_ret_vaddr =3D=3D trampoline_vaddr); @@ -1945,7 +1971,7 @@ static void prepare_uretprobe(struct uprobe *uprobe, = struct pt_regs *regs) * attack from user-space. */ uprobe_warn(current, "handle tail call"); - goto fail; + goto put; } orig_ret_vaddr =3D utask->return_instances->orig_ret_vaddr; } @@ -1960,9 +1986,10 @@ static void prepare_uretprobe(struct uprobe *uprobe,= struct pt_regs *regs) utask->return_instances =3D ri; =20 return; -fail: - kfree(ri); +put: put_uprobe(uprobe); +free: + kfree(ri); } =20 /* Prepare to single-step probed instruction out of line. */ @@ -2114,35 +2141,94 @@ static struct uprobe *find_active_uprobe_rcu(unsign= ed long bp_vaddr, int *is_swb return uprobe; } =20 +static struct return_instance* +push_consumer(struct return_instance *ri, int idx, __u64 id, __u64 cookie,= int rc) +{ + if (unlikely(ri =3D=3D ZERO_SIZE_PTR)) + return ri; + + if (unlikely(idx >=3D ri->consumers_cnt)) { + struct return_instance *old_ri =3D ri; + + ri->consumers_cnt +=3D DEF_CNT; + ri =3D krealloc(old_ri, ri_size(old_ri->consumers_cnt), GFP_KERNEL); + if (!ri) { + kfree(old_ri); + return ZERO_SIZE_PTR; + } + } + + ri->consumers[idx].id =3D id; + ri->consumers[idx].cookie =3D cookie; + ri->consumers[idx].rc =3D rc; + return ri; +} + +static struct return_consumer * +return_consumer_find(struct return_instance *ri, int *iter, int id) +{ + struct return_consumer *ric; + int idx =3D *iter; + + for (ric =3D &ri->consumers[idx]; idx < ri->consumers_cnt; idx++, ric++) { + if (ric->id =3D=3D id) { + *iter =3D idx + 1; + return ric; + } + } + return NULL; +} + static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs) { struct uprobe_consumer *uc; - int remove =3D UPROBE_HANDLER_REMOVE; - bool need_prep =3D false; /* prepare return uprobe, when needed */ - bool has_consumers =3D false; + bool has_consumers =3D false, remove =3D true, ignore =3D true; + struct return_instance *ri =3D NULL; + int push_idx =3D 0; =20 current->utask->auprobe =3D &uprobe->arch; =20 list_for_each_entry_srcu(uc, &uprobe->consumers, cons_node, srcu_read_lock_held(&uprobes_srcu)) { + __u64 cookie =3D 0; int rc =3D 0; =20 if (uc->handler) { - rc =3D uc->handler(uc, regs); - WARN(rc & ~UPROBE_HANDLER_MASK, + rc =3D uc->handler(uc, regs, &cookie); + WARN(rc < 0 || rc > 3, "bad rc=3D0x%x from %ps()\n", rc, uc->handler); } =20 - if (uc->ret_handler) - need_prep =3D true; - - remove &=3D rc; + remove &=3D rc =3D=3D UPROBE_HANDLER_REMOVE; + ignore &=3D rc =3D=3D UPROBE_HANDLER_IGNORE; has_consumers =3D true; + + if (!uc->ret_handler || rc =3D=3D UPROBE_HANDLER_REMOVE) + continue; + + /* + * If alloc_return_instance and push_consumer fail, the return probe + * won't be prepared, but we'll finish to execute all entry handlers. + * + * We need to store handler's return value in case the return uprobe + * gets installed and contains consumers that need to be ignored. + */ + if (!ri) + ri =3D alloc_return_instance(); + + if (rc =3D=3D UPROBE_HANDLER_IWANTMYCOOKIE || rc =3D=3D UPROBE_HANDLER_I= GNORE) + ri =3D push_consumer(ri, push_idx++, uc->id, cookie, rc); } current->utask->auprobe =3D NULL; =20 - if (need_prep && !remove) - prepare_uretprobe(uprobe, regs); /* put bp at return */ + if (!ignore && !ZERO_OR_NULL_PTR(ri)) { + /* + * The push_idx value has the final number of return consumers, + * and ri->consumers_cnt has number of allocated consumers. + */ + ri->consumers_cnt =3D push_idx; + prepare_uretprobe(uprobe, regs, ri); + } =20 if (remove && has_consumers) { down_read(&uprobe->register_rwsem); @@ -2161,14 +2247,18 @@ static void handle_uretprobe_chain(struct return_instance *ri, struct pt_regs *regs) { struct uprobe *uprobe =3D ri->uprobe; + struct return_consumer *ric; struct uprobe_consumer *uc; - int srcu_idx; + int srcu_idx, ric_idx =3D 0; =20 srcu_idx =3D srcu_read_lock(&uprobes_srcu); list_for_each_entry_srcu(uc, &uprobe->consumers, cons_node, srcu_read_lock_held(&uprobes_srcu)) { + ric =3D return_consumer_find(ri, &ric_idx, uc->id); + if (ric && ric->rc =3D=3D UPROBE_HANDLER_IGNORE) + continue; if (uc->ret_handler) - uc->ret_handler(uc, ri->func, regs); + uc->ret_handler(uc, ri->func, regs, ric ? &ric->cookie : NULL); } srcu_read_unlock(&uprobes_srcu, srcu_idx); } --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63C1D150990; Tue, 17 Sep 2024 08:51:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563070; cv=none; b=Emg3NMk1RTmjcZyE/x7Xv2jy+zsdXEjYJC1kmnyCGtGoWOj/Pc2u+GGwWDBspDTmTr4qkO2AgHekTfHAwQ5z+n9yMGxYSZhgoqhJFnddB4fk1lIvbzJAzjNqt11/UkIJ32okG89agGwmsh1mBg792PHhYLnORNOoqh2g4sTabPM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; 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charset="utf-8" Adding support to attach BPF program for entry and return probe of the same function. This is common use case which at the moment requires to create two uprobe multi links. Adding new BPF_TRACE_UPROBE_SESSION attach type that instructs kernel to attach single link program to both entry and exit probe. It's possible to control execution of the BPF program on return probe simply by returning zero or non zero from the entry BPF program execution to execute or not the BPF program on return probe respectively. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- include/uapi/linux/bpf.h | 1 + kernel/bpf/syscall.c | 9 ++++++-- kernel/trace/bpf_trace.c | 39 +++++++++++++++++++++++++++------- tools/include/uapi/linux/bpf.h | 1 + tools/lib/bpf/libbpf.c | 1 + 5 files changed, 41 insertions(+), 10 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 35bcf52dbc65..1d93cb014884 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1116,6 +1116,7 @@ enum bpf_attach_type { BPF_NETKIT_PRIMARY, BPF_NETKIT_PEER, BPF_TRACE_KPROBE_SESSION, + BPF_TRACE_UPROBE_SESSION, __MAX_BPF_ATTACH_TYPE }; =20 diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index bf6c5f685ea2..1347f3000bd0 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -4049,10 +4049,14 @@ static int bpf_prog_attach_check_attach_type(const = struct bpf_prog *prog, if (prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_MULTI && attach_type !=3D BPF_TRACE_UPROBE_MULTI) return -EINVAL; + if (prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_SESSION && + attach_type !=3D BPF_TRACE_UPROBE_SESSION) + return -EINVAL; if (attach_type !=3D BPF_PERF_EVENT && attach_type !=3D BPF_TRACE_KPROBE_MULTI && attach_type !=3D BPF_TRACE_KPROBE_SESSION && - attach_type !=3D BPF_TRACE_UPROBE_MULTI) + attach_type !=3D BPF_TRACE_UPROBE_MULTI && + attach_type !=3D BPF_TRACE_UPROBE_SESSION) return -EINVAL; return 0; case BPF_PROG_TYPE_SCHED_CLS: @@ -5315,7 +5319,8 @@ static int link_create(union bpf_attr *attr, bpfptr_t= uattr) else if (attr->link_create.attach_type =3D=3D BPF_TRACE_KPROBE_MULTI || attr->link_create.attach_type =3D=3D BPF_TRACE_KPROBE_SESSION) ret =3D bpf_kprobe_multi_link_attach(attr, prog); - else if (attr->link_create.attach_type =3D=3D BPF_TRACE_UPROBE_MULTI) + else if (attr->link_create.attach_type =3D=3D BPF_TRACE_UPROBE_MULTI || + attr->link_create.attach_type =3D=3D BPF_TRACE_UPROBE_SESSION) ret =3D bpf_uprobe_multi_link_attach(attr, prog); break; default: diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index de241503c8fb..63ea457af16a 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1645,6 +1645,17 @@ static inline bool is_kprobe_session(const struct bp= f_prog *prog) return prog->expected_attach_type =3D=3D BPF_TRACE_KPROBE_SESSION; } =20 +static inline bool is_uprobe_multi(const struct bpf_prog *prog) +{ + return prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_MULTI || + prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_SESSION; +} + +static inline bool is_uprobe_session(const struct bpf_prog *prog) +{ + return prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_SESSION; +} + static const struct bpf_func_proto * kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *pr= og) { @@ -1662,13 +1673,13 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, co= nst struct bpf_prog *prog) case BPF_FUNC_get_func_ip: if (is_kprobe_multi(prog)) return &bpf_get_func_ip_proto_kprobe_multi; - if (prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_MULTI) + if (is_uprobe_multi(prog)) return &bpf_get_func_ip_proto_uprobe_multi; return &bpf_get_func_ip_proto_kprobe; case BPF_FUNC_get_attach_cookie: if (is_kprobe_multi(prog)) return &bpf_get_attach_cookie_proto_kmulti; - if (prog->expected_attach_type =3D=3D BPF_TRACE_UPROBE_MULTI) + if (is_uprobe_multi(prog)) return &bpf_get_attach_cookie_proto_umulti; return &bpf_get_attach_cookie_proto_trace; default: @@ -3162,6 +3173,7 @@ struct bpf_uprobe { u64 cookie; struct uprobe *uprobe; struct uprobe_consumer consumer; + bool session; }; =20 struct bpf_uprobe_multi_link { @@ -3336,9 +3348,13 @@ uprobe_multi_link_handler(struct uprobe_consumer *co= n, struct pt_regs *regs, __u64 *data) { struct bpf_uprobe *uprobe; + int ret; =20 uprobe =3D container_of(con, struct bpf_uprobe, consumer); - return uprobe_prog_run(uprobe, instruction_pointer(regs), regs); + ret =3D uprobe_prog_run(uprobe, instruction_pointer(regs), regs); + if (uprobe->session) + return ret ? UPROBE_HANDLER_IGNORE : UPROBE_HANDLER_IWANTMYCOOKIE; + return ret; } =20 static int @@ -3348,6 +3364,12 @@ uprobe_multi_link_ret_handler(struct uprobe_consumer= *con, unsigned long func, s struct bpf_uprobe *uprobe; =20 uprobe =3D container_of(con, struct bpf_uprobe, consumer); + /* + * There's chance we could get called with NULL data if we registered upr= obe + * after it hit entry but before it hit return probe, just ignore it. + */ + if (uprobe->session && !data) + return 0; return uprobe_prog_run(uprobe, func, regs); } =20 @@ -3387,7 +3409,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr= *attr, struct bpf_prog *pr if (sizeof(u64) !=3D sizeof(void *)) return -EOPNOTSUPP; =20 - if (prog->expected_attach_type !=3D BPF_TRACE_UPROBE_MULTI) + if (!is_uprobe_multi(prog)) return -EINVAL; =20 flags =3D attr->link_create.uprobe_multi.flags; @@ -3463,11 +3485,12 @@ int bpf_uprobe_multi_link_attach(const union bpf_at= tr *attr, struct bpf_prog *pr =20 uprobes[i].link =3D link; =20 - if (flags & BPF_F_UPROBE_MULTI_RETURN) - uprobes[i].consumer.ret_handler =3D uprobe_multi_link_ret_handler; - else + if (!(flags & BPF_F_UPROBE_MULTI_RETURN)) uprobes[i].consumer.handler =3D uprobe_multi_link_handler; - + if (flags & BPF_F_UPROBE_MULTI_RETURN || is_uprobe_session(prog)) + uprobes[i].consumer.ret_handler =3D uprobe_multi_link_ret_handler; + if (is_uprobe_session(prog)) + uprobes[i].session =3D true; if (pid) uprobes[i].consumer.filter =3D uprobe_multi_link_filter; } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 35bcf52dbc65..1d93cb014884 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1116,6 +1116,7 @@ enum bpf_attach_type { BPF_NETKIT_PRIMARY, BPF_NETKIT_PEER, BPF_TRACE_KPROBE_SESSION, + BPF_TRACE_UPROBE_SESSION, __MAX_BPF_ATTACH_TYPE }; =20 diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a3be6f8fac09..274441674f92 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -133,6 +133,7 @@ static const char * const attach_type_name[] =3D { [BPF_NETKIT_PRIMARY] =3D "netkit_primary", [BPF_NETKIT_PEER] =3D "netkit_peer", [BPF_TRACE_KPROBE_SESSION] =3D "trace_kprobe_session", + [BPF_TRACE_UPROBE_SESSION] =3D "trace_uprobe_session", }; =20 static const char * const link_type_name[] =3D { --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD2D514BFBF; Tue, 17 Sep 2024 08:51:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563083; cv=none; b=W+WydSc0aF/aPoVB1tPQUqByUa7//NtVg2XBPohonIq8MwKUbeNlHt/tg0t7DQ0M9a0m9kMhwCo7q9X8oK7PcvjrQB55S8pMoFuYGfhK7Qeoisc1/mVZZsRxkmHl9kQmkTFgoqUovRcHG7VS6Sfkzlc0EWs+5SDWqyzY+hP3DDY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563083; c=relaxed/simple; bh=E5ksyVpxSxCr84wbzqQecnCcRAmkbzdRXeqaxZgzDAk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hjHKFudTedRDUOXuc7PRczjODkr+l7FyRk8IQUZWl3huRI7MAlMus1ADlDEztBwiHwgC+R8ekRDy1v9OQYdPDajMx6qMNS6Ukjna022Cv75FBTOapaYcUx9Q2EClVTZUXNorH6nWFGxKSW/zDNKCnRJr+LrV5cJ5Z7IisifyudU= ARC-Authentication-Results: i=1; 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charset="utf-8" Placing bpf_session_run_ctx layer in between bpf_run_ctx and bpf_uprobe_multi_run_ctx, so the session data can be retrieved from uprobe_multi link. Plus granting session kfuncs access to uprobe session programs. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 63ea457af16a..b6f377f1ce5f 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3186,7 +3186,7 @@ struct bpf_uprobe_multi_link { }; =20 struct bpf_uprobe_multi_run_ctx { - struct bpf_run_ctx run_ctx; + struct bpf_session_run_ctx session_ctx; unsigned long entry_ip; struct bpf_uprobe *uprobe; }; @@ -3299,10 +3299,15 @@ static const struct bpf_link_ops bpf_uprobe_multi_l= ink_lops =3D { =20 static int uprobe_prog_run(struct bpf_uprobe *uprobe, unsigned long entry_ip, - struct pt_regs *regs) + struct pt_regs *regs, + bool is_return, void *data) { struct bpf_uprobe_multi_link *link =3D uprobe->link; struct bpf_uprobe_multi_run_ctx run_ctx =3D { + .session_ctx =3D { + .is_return =3D is_return, + .data =3D data, + }, .entry_ip =3D entry_ip, .uprobe =3D uprobe, }; @@ -3321,7 +3326,7 @@ static int uprobe_prog_run(struct bpf_uprobe *uprobe, =20 migrate_disable(); =20 - old_run_ctx =3D bpf_set_run_ctx(&run_ctx.run_ctx); + old_run_ctx =3D bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); err =3D bpf_prog_run(link->link.prog, regs); bpf_reset_run_ctx(old_run_ctx); =20 @@ -3351,7 +3356,7 @@ uprobe_multi_link_handler(struct uprobe_consumer *con= , struct pt_regs *regs, int ret; =20 uprobe =3D container_of(con, struct bpf_uprobe, consumer); - ret =3D uprobe_prog_run(uprobe, instruction_pointer(regs), regs); + ret =3D uprobe_prog_run(uprobe, instruction_pointer(regs), regs, false, d= ata); if (uprobe->session) return ret ? UPROBE_HANDLER_IGNORE : UPROBE_HANDLER_IWANTMYCOOKIE; return ret; @@ -3370,14 +3375,15 @@ uprobe_multi_link_ret_handler(struct uprobe_consume= r *con, unsigned long func, s */ if (uprobe->session && !data) return 0; - return uprobe_prog_run(uprobe, func, regs); + return uprobe_prog_run(uprobe, func, regs, true, data); } =20 static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) { struct bpf_uprobe_multi_run_ctx *run_ctx; =20 - run_ctx =3D container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ct= x, run_ctx); + run_ctx =3D container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ct= x, + session_ctx.run_ctx); return run_ctx->entry_ip; } =20 @@ -3385,7 +3391,8 @@ static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx= *ctx) { struct bpf_uprobe_multi_run_ctx *run_ctx; =20 - run_ctx =3D container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ct= x, run_ctx); + run_ctx =3D container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ct= x, + session_ctx.run_ctx); return run_ctx->uprobe->cookie; } =20 @@ -3579,7 +3586,7 @@ static int bpf_kprobe_multi_filter(const struct bpf_p= rog *prog, u32 kfunc_id) if (!btf_id_set8_contains(&kprobe_multi_kfunc_set_ids, kfunc_id)) return 0; =20 - if (!is_kprobe_session(prog)) + if (!is_kprobe_session(prog) && !is_uprobe_session(prog)) return -EACCES; =20 return 0; --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10EAE1531DB; Tue, 17 Sep 2024 08:51:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563095; cv=none; b=dAMj2fJre8ywqJqpQkO/xV9R06vwudsftc6HtBFaCeLnDsWN/b8kK2RzN0P1Hn+NfCWG+T4/9poNdcknk6T4fMFmVV/bqGqW8XbkpqJIUac9w7Ecc+0HHm3lyqSXPyFZcsjrzXhZkljAKPGFVzqyBtouD5mW2dHxJ3bdgcSx3F4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563095; c=relaxed/simple; bh=CPerKjyUxXsQem1//02PfSk7GL1ToGqym/zky5T6kMw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JrM2CGHNsBU/Pi+Io3+AHxhsiZjL2AjJ0onf1kQETM1nDaoYm4fLwyHu71GX/Gb2R4yWSVZ0egBlivQIyv4FU6EL2VbzPIJ6ttx6PMcWit71GSSZeI/sgB/hWynAvVb7Yljxth0QMeT6VagLWQxupa+TTw/QgZCtB1hZHTW6LSE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Vyx8liOH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Vyx8liOH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42C0AC4CEC5; Tue, 17 Sep 2024 08:51:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563094; bh=CPerKjyUxXsQem1//02PfSk7GL1ToGqym/zky5T6kMw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vyx8liOHTixui+kIOZ8huwdmz0eYibNSQyKvdXsc7214UiUn7NyoC2oHdrFJUdnke z2nA49abu/A1XbvJEb+wO0ZWN+qk6NBnWa9hwIAPMNluSagAnwwISQI3VkaeosKCC0 N5JCKruLs/+vHo6Ap3zNgtMwHAQXZjbDK6lc5g/s61/BvQ3cRONRTItjQQ32amQjck bV7oJjFm4J7kGgWPfvyEUH9DhIotd3TybBnIWCMmHVEJNu6tKtwpzaaJ+DnrrOYdqk 8dk/53IiCtYqwJuVJjsjU0HNfdXwZtUBhb5groC2RubcXKDkU56FSgONPQ4nWY/ulL IDVC27xL5ZwiQ== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 05/14] bpf: Allow return values 0 and 1 for uprobe/kprobe session Date: Tue, 17 Sep 2024 10:50:15 +0200 Message-ID: <20240917085024.765883-6-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The uprobe and kprobe session program can return only 0 or 1, instruct verifier to check for that. Signed-off-by: Jiri Olsa --- kernel/bpf/verifier.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index d8520095ca03..988858fc37e5 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -15668,6 +15668,16 @@ static int check_return_code(struct bpf_verifier_e= nv *env, int regno, const char return -ENOTSUPP; } break; + case BPF_PROG_TYPE_KPROBE: + switch (env->prog->expected_attach_type) { + case BPF_TRACE_KPROBE_SESSION: + case BPF_TRACE_UPROBE_SESSION: + range =3D retval_range(0, 1); + break; + default: + return 0; + } + break; case BPF_PROG_TYPE_SK_LOOKUP: range =3D retval_range(SK_DROP, SK_PASS); break; --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D0DCB158875; Tue, 17 Sep 2024 08:51:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563107; cv=none; b=WjBOswwZ4+6pxwcolVPTWuHFOkye8LdsGLehOsdSYMe3zamFMmOSDzfSjb8qPnTqfR2FNny+XiteVAR9N5tLPnSSnyajs9uBZlA5PJ+i5GQyBWnh+3PdkjxbXOQhxbLWx8SveADaOnqoyomJMbvU/kkxQnYU91L70m01shnlSnI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563107; c=relaxed/simple; bh=qzy+FMkoW/u33RpdnvGiDT4W8kM5LMJuThnvREeYUfM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Bg8albLKYZbMLm86uaLXPglFw9MykEDl7liOCo/tMdXUEFilFDyhm5+tnzQgCkTeBqXkYZ67AZx6vI4qhcsDxQrGi6KwZV8rK2nHLK+gQTcQn77gYBcRfPmytqtqcMd2rZKj5QGV0oSnyIB5JxlY0hMTU3WQnwZdP5gKmjZotBg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CC+8OGXx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CC+8OGXx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 709F0C4CEC5; Tue, 17 Sep 2024 08:51:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563107; bh=qzy+FMkoW/u33RpdnvGiDT4W8kM5LMJuThnvREeYUfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CC+8OGXxxK1sD89z6KBWUx84gH20ODy20SLJUdrOPeYv7KKCQrFeq6UgvvvEDP/I9 u8Q1GWiGaiy/2ckhIVS5ChA3UGcXylJEa78u85RQZRBhaAEptMbBToBGQvFNNnxyBv A/SrAaW22dEcjzw4eJ7CUGhOwCye0dBuNlie7/Hmlk9t3h+aoSuho7lK4Swj8dyDVq QDfRYsDU62eBlaB4myP8CZIYJPP9tRbuKecgNGQ47Gp9QllSARJ8LDBdBvRlqpGr1k 9h0ncS6LoeSl49Qqd9/4bWZfZiSwJdzkqx6n1OM5TEEc5pXbuEl2bOue8jq7B6tbEk w82yCQ/MimBsw== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 06/14] libbpf: Fix uretprobe.multi.s programs auto attachment Date: Tue, 17 Sep 2024 10:50:16 +0200 Message-ID: <20240917085024.765883-7-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As reported by Andrii we don't currently recognize uretprobe.multi.s programs as return probes due to using (wrong) strcmp function. Using str_has_pfx() instead to match uretprobe.multi prefix. Tests are passing, because the return program was executed as entry program and all counts were incremented properly. Reported-by: Andrii Nakryiko Signed-off-by: Jiri Olsa Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20240910125336.3056271-1-jolsa@kernel.org --- tools/lib/bpf/libbpf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 274441674f92..6917d4a0bd4e 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -11684,7 +11684,7 @@ static int attach_uprobe_multi(const struct bpf_pro= gram *prog, long cookie, stru ret =3D 0; break; case 3: - opts.retprobe =3D strcmp(probe_type, "uretprobe.multi") =3D=3D 0; + opts.retprobe =3D str_has_pfx(probe_type, "uretprobe.multi"); *link =3D bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_n= ame, &opts); ret =3D libbpf_get_error(*link); break; --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B58C01531DB; Tue, 17 Sep 2024 08:51:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563119; cv=none; b=ISjnLojvzUmtFzJU9XExfkBZyjoVjgn9r/fGhRuEyuGvED30F+fsUXppSaIWBZDpMJD5anICb8f9DApFoHOvjjXWprD/RFB5/o/o612VOnSK5V4UW8wI83UAmZEORVVuE+Ymnm8pRGsdDoNkOZ9XgrbPNsHRqAkt7EKQXnQXjBQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563119; c=relaxed/simple; bh=3lpH1TcPLZZROLVAgrsQatm8wpUWuKts3MBt4vGURUI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HfGil3WW0MDllRJLiXj21pj+s2PQzdrWrqszjzvLEkLRqKu2cfgt70pd92I1Zp49sJB55IIRLy/EWmxmj6H0EsKg3hQG0hYJuuahHYj38TuHRPwlkf5ZeyfM9oDBmN/Th6EmFXt9Rt6iStuXyP41lkJ4uiadRKjxxcA1FxoNNh4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L4uS4nmN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="L4uS4nmN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9862C4CEC5; Tue, 17 Sep 2024 08:51:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563119; bh=3lpH1TcPLZZROLVAgrsQatm8wpUWuKts3MBt4vGURUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L4uS4nmNrX9yNY8rSKjBlncd45hMw2rnIl7ZfZcxP02kXJ12JTiOILIYGAnwZrZbz s3FBpuuCakwJHKN3oopgMvJQ14wmn7MpYaPc5BpoyY8TEIATdzkExyc0n5yN13ZIuJ rgLSu2oKwQi2duedPCh+1E7bKRT2l7TboCnynGUywWg87F6PiX95QmEimm5SaUnuAj HWomALSlbhBzzbsoMhQd2zPVUq1wAcbk5Gaxw1r35lvYzIJV4kgk99QueyqcUx2kjO 3bFwhpZeQd8TWUyTGvKZf12yoJ5Na1Icc8X9GOqMZ4xJ1ruUcC1snjjw8AFrb0Dk8p i4hb6zaCscz2g== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 07/14] libbpf: Add support for uprobe multi session attach Date: Tue, 17 Sep 2024 10:50:17 +0200 Message-ID: <20240917085024.765883-8-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding support to attach program in uprobe session mode with bpf_program__attach_uprobe_multi function. Adding session bool to bpf_uprobe_multi_opts struct that allows to load and attach the bpf program via uprobe session. the attachment to create uprobe multi session. Also adding new program loader section that allows: SEC("uprobe.session/bpf_fentry_test*") and loads/attaches uprobe program as uprobe session. Adding sleepable hook (uprobe.session.s) as well. Signed-off-by: Jiri Olsa --- tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++--- tools/lib/bpf/libbpf.h | 4 +++- 3 files changed, 22 insertions(+), 4 deletions(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 2a4c71501a17..becdfa701c75 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -776,6 +776,7 @@ int bpf_link_create(int prog_fd, int target_fd, return libbpf_err(-EINVAL); break; case BPF_TRACE_UPROBE_MULTI: + case BPF_TRACE_UPROBE_SESSION: attr.link_create.uprobe_multi.flags =3D OPTS_GET(opts, uprobe_multi.flag= s, 0); attr.link_create.uprobe_multi.cnt =3D OPTS_GET(opts, uprobe_multi.cnt, 0= ); attr.link_create.uprobe_multi.path =3D ptr_to_u64(OPTS_GET(opts, uprobe_= multi.path, 0)); diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 6917d4a0bd4e..83e56856b2b4 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -9363,8 +9363,10 @@ static const struct bpf_sec_def section_defs[] =3D { SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, at= tach_kprobe_session), SEC_DEF("uprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach= _uprobe_multi), SEC_DEF("uretprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, att= ach_uprobe_multi), + SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, at= tach_uprobe_multi), SEC_DEF("uprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE,= attach_uprobe_multi), SEC_DEF("uretprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPAB= LE, attach_uprobe_multi), + SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPA= BLE, attach_uprobe_multi), SEC_DEF("ksyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall), SEC_DEF("kretsyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall), SEC_DEF("usdt+", KPROBE, 0, SEC_USDT, attach_usdt), @@ -11684,7 +11686,10 @@ static int attach_uprobe_multi(const struct bpf_pr= ogram *prog, long cookie, stru ret =3D 0; break; case 3: - opts.retprobe =3D str_has_pfx(probe_type, "uretprobe.multi"); + if (str_has_pfx(probe_type, "uprobe.session")) + opts.session =3D true; + else + opts.retprobe =3D str_has_pfx(probe_type, "uretprobe.multi"); *link =3D bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_n= ame, &opts); ret =3D libbpf_get_error(*link); break; @@ -11933,10 +11938,12 @@ bpf_program__attach_uprobe_multi(const struct bpf= _program *prog, const unsigned long *ref_ctr_offsets =3D NULL, *offsets =3D NULL; LIBBPF_OPTS(bpf_link_create_opts, lopts); unsigned long *resolved_offsets =3D NULL; + enum bpf_attach_type attach_type; int err =3D 0, link_fd, prog_fd; struct bpf_link *link =3D NULL; char errmsg[STRERR_BUFSIZE]; char full_path[PATH_MAX]; + bool retprobe, session; const __u64 *cookies; const char **syms; size_t cnt; @@ -12007,12 +12014,20 @@ bpf_program__attach_uprobe_multi(const struct bpf= _program *prog, offsets =3D resolved_offsets; } =20 + retprobe =3D OPTS_GET(opts, retprobe, false); + session =3D OPTS_GET(opts, session, false); + + if (retprobe && session) + return libbpf_err_ptr(-EINVAL); + + attach_type =3D session ? BPF_TRACE_UPROBE_SESSION : BPF_TRACE_UPROBE_MUL= TI; + lopts.uprobe_multi.path =3D path; lopts.uprobe_multi.offsets =3D offsets; lopts.uprobe_multi.ref_ctr_offsets =3D ref_ctr_offsets; lopts.uprobe_multi.cookies =3D cookies; lopts.uprobe_multi.cnt =3D cnt; - lopts.uprobe_multi.flags =3D OPTS_GET(opts, retprobe, false) ? BPF_F_UPRO= BE_MULTI_RETURN : 0; + lopts.uprobe_multi.flags =3D retprobe ? BPF_F_UPROBE_MULTI_RETURN : 0; =20 if (pid =3D=3D 0) pid =3D getpid(); @@ -12026,7 +12041,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_p= rogram *prog, } link->detach =3D &bpf_link__detach_fd; =20 - link_fd =3D bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &lopts); + link_fd =3D bpf_link_create(prog_fd, 0, attach_type, &lopts); if (link_fd < 0) { err =3D -errno; pr_warn("prog '%s': failed to attach multi-uprobe: %s\n", diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 64a6a3d323e3..f6a7835dc519 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -569,10 +569,12 @@ struct bpf_uprobe_multi_opts { size_t cnt; /* create return uprobes */ bool retprobe; + /* create session kprobes */ + bool session; size_t :0; }; =20 -#define bpf_uprobe_multi_opts__last_field retprobe +#define bpf_uprobe_multi_opts__last_field session =20 /** * @brief **bpf_program__attach_uprobe_multi()** attaches a BPF program --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 07B5A15ADAB; Tue, 17 Sep 2024 08:52:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563132; cv=none; b=e6n2PZHsWC/fK6beMXEl60g9uHXIgeXLgPSZD9L1hQmwgTzj4EXX8SGMRoKDs8CnWFeBkBZaIxU5edVIOVMyiusjBpfunZK/mbcsz2JUW7rEJnZcgBnU1u2fkom8Fjh1v0S36aC0siQOjBlhURi1nfC4znH+GX5r/hr0LSbaaEs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563132; c=relaxed/simple; bh=NV3KzQLw5z3H19RYLmMhYi2gP7SMG260xbshGM97vmc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LdfWPr4+0fmYDasBakamYJAu3ysJz/7oEgFyZwlqTPrJodfBtVt35gsDzPuhmvrOvxDes3znyXaG7rq8NoV/yCfS/KBUQ6SIsO4rcaA6lS7xsWqteq9iiP3dCSSz9ftth5JX/ui+1AIx3Tu87Io14X9wwlUAW8r9k/OGn44TL28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RpDu/FIp; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RpDu/FIp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C84E2C4CEC5; Tue, 17 Sep 2024 08:52:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563131; bh=NV3KzQLw5z3H19RYLmMhYi2gP7SMG260xbshGM97vmc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RpDu/FIpspFwyDYoE9mWf8thsgH06hkjjXSWlNeyzFnE7CagMuODCuy/dJSQVCbaJ B7wlSfKQxhT50E2cUCFcr+lbzHAVX8wArtXjNGAZ9c1WzcC8p1bjILGkejHG3+KM3m OOHb/AQ74Ms56+CdTSHVpnffwVPcBBxmTSwV+xSM2d6u0bJR1yOainv2Kp8NUrn6oh LMMFSqLgiUaO+T5hEIEm/dyIVibhnimS532tZT/8XpieZAHl/1mibjKD+B94fqT317 AgRq4ObAyKcbld1jtFE2qjtPR5YsORKCwHNnq01HeRMAvQxdFtRsy50nY5+5xbxFkW gcmjG9YH5tIiA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 08/14] selftests/bpf: Add uprobe session test Date: Tue, 17 Sep 2024 10:50:18 +0200 Message-ID: <20240917085024.765883-9-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding uprobe session test and testing that the entry program return value controls execution of the return probe program. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 47 ++++++++++++ .../bpf/progs/uprobe_multi_session.c | 71 +++++++++++++++++++ 2 files changed, 118 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index bf6ca8e3eb13..aaafd80623c5 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -6,6 +6,7 @@ #include "uprobe_multi.skel.h" #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" +#include "uprobe_multi_session.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -615,6 +616,50 @@ static void test_link_api(void) __test_link_api(child); } =20 +static void test_session_skel_api(void) +{ + struct uprobe_multi_session *skel =3D NULL; + LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); + struct bpf_link *link =3D NULL; + int err; + + skel =3D uprobe_multi_session__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_session__open_and_load")) + goto cleanup; + + skel->bss->pid =3D getpid(); + skel->bss->user_ptr =3D test_data; + + err =3D uprobe_multi_session__attach(skel); + if (!ASSERT_OK(err, "uprobe_multi_session__attach")) + goto cleanup; + + /* trigger all probes */ + skel->bss->uprobe_multi_func_1_addr =3D (__u64) uprobe_multi_func_1; + skel->bss->uprobe_multi_func_2_addr =3D (__u64) uprobe_multi_func_2; + skel->bss->uprobe_multi_func_3_addr =3D (__u64) uprobe_multi_func_3; + + uprobe_multi_func_1(); + uprobe_multi_func_2(); + uprobe_multi_func_3(); + + /* + * We expect 2 for uprobe_multi_func_2 because it runs both entry/return = probe, + * uprobe_multi_func_[13] run just the entry probe. All expected numbers = are + * doubled, because we run extra test for sleepable session. + */ + ASSERT_EQ(skel->bss->uprobe_session_result[0], 2, "uprobe_multi_func_1_re= sult"); + ASSERT_EQ(skel->bss->uprobe_session_result[1], 4, "uprobe_multi_func_2_re= sult"); + ASSERT_EQ(skel->bss->uprobe_session_result[2], 2, "uprobe_multi_func_3_re= sult"); + + /* We expect increase in 3 entry and 1 return session calls -> 4 */ + ASSERT_EQ(skel->bss->uprobe_multi_sleep_result, 4, "uprobe_multi_sleep_re= sult"); + +cleanup: + bpf_link__destroy(link); + uprobe_multi_session__destroy(skel); +} + static void test_bench_attach_uprobe(void) { long attach_start_ns =3D 0, attach_end_ns =3D 0; @@ -703,4 +748,6 @@ void test_uprobe_multi_test(void) test_bench_attach_usdt(); if (test__start_subtest("attach_api_fails")) test_attach_api_fails(); + if (test__start_subtest("session")) + test_session_skel_api(); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session.c b/too= ls/testing/selftests/bpf/progs/uprobe_multi_session.c new file mode 100644 index 000000000000..30bff90b68dc --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include "bpf_kfuncs.h" +#include "bpf_misc.h" + +char _license[] SEC("license") =3D "GPL"; + +__u64 uprobe_multi_func_1_addr =3D 0; +__u64 uprobe_multi_func_2_addr =3D 0; +__u64 uprobe_multi_func_3_addr =3D 0; + +__u64 uprobe_session_result[3] =3D {}; +__u64 uprobe_multi_sleep_result =3D 0; + +void *user_ptr =3D 0; +int pid =3D 0; + +static int uprobe_multi_check(void *ctx, bool is_return) +{ + const __u64 funcs[] =3D { + uprobe_multi_func_1_addr, + uprobe_multi_func_2_addr, + uprobe_multi_func_3_addr, + }; + unsigned int i; + __u64 addr; + + if (bpf_get_current_pid_tgid() >> 32 !=3D pid) + return 1; + + addr =3D bpf_get_func_ip(ctx); + + for (i =3D 0; i < ARRAY_SIZE(funcs); i++) { + if (funcs[i] =3D=3D addr) { + uprobe_session_result[i]++; + break; + } + } + + /* only uprobe_multi_func_2 executes return probe */ + if ((addr =3D=3D uprobe_multi_func_1_addr) || + (addr =3D=3D uprobe_multi_func_3_addr)) + return 1; + + return 0; +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*") +int uprobe(struct pt_regs *ctx) +{ + return uprobe_multi_check(ctx, bpf_session_is_return()); +} + +static __always_inline bool verify_sleepable_user_copy(void) +{ + char data[9]; + + bpf_copy_from_user(data, sizeof(data), user_ptr); + return bpf_strncmp(data, sizeof(data), "test_data") =3D=3D 0; +} + +SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*") +int uprobe_sleepable(struct pt_regs *ctx) +{ + if (verify_sleepable_user_copy()) + uprobe_multi_sleep_result++; + return uprobe_multi_check(ctx, bpf_session_is_return()); +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A713C15B57D; Tue, 17 Sep 2024 08:52:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563143; cv=none; b=n3W26W1ou8X7SLHor/dPuMRe7nzgYNrUqJigETM9Xu/Zwl8thZr6tUACC5FI8KotV8VP4r+01h9Tcsn3qtOdyVX2YxU4Rqe5bz4C82zZPiiK4rD13LVEJnm6tQs+jRBZBIJucVJsBTrojJPSeKxtG4bseLzc2DHiWYBmz8MzbH4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563143; c=relaxed/simple; bh=b0A2fXg46VpGZuPVfILfDGkJwuLwKYJbupEFRw9KQUo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ccTsqRLSu1sKsjRGqBb1bBCVn0lyG6tyzChDm1T70wX7JJXTZhyPI9AXYIg+NEvVZxAjM6PFXlLzibZbGUrBrv0E1wY+jOy3pai2qH2KqwHcibxd8T1ddh9vlb11FZOgDbUFOv7d2CCK6CziSS+uPgjrlVMOaoB/3Kzp/OklTo0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZU1ClqXS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZU1ClqXS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C37FC4CEC5; Tue, 17 Sep 2024 08:52:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563143; bh=b0A2fXg46VpGZuPVfILfDGkJwuLwKYJbupEFRw9KQUo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZU1ClqXSbNUjzzPema8GHNbcOwVOi8Okr9fc4lQ273FXgCglrjKlFplJidtyGlxxi t29ZgnNuqx1DvN7I2W9miXbjuYZVIrmTmJY4Q7IbtKhHC3fdO9E1Zp06MAh0CRNhDZ l2B1NSwQt81xEk/U1MoHdKX19O5BuUvBmQBPHclopSlAtNKgBpqSo32XiDUyhqyLTR iV5CFf9x2vz7PKlj1Jlxr5pEkt9WrekRA4yVE4HS6G1/nN1JFTi0jITISRWaNSIwa5 Znj2l3+pO8yjv8qA9QhXexJGDXcsw72tp4H4mhdYGIT4SGk2Um7+Z4Wx8kAFfJKR2z 2WRRQdwh3A69A== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 09/14] selftests/bpf: Add uprobe session cookie test Date: Tue, 17 Sep 2024 10:50:19 +0200 Message-ID: <20240917085024.765883-10-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding uprobe session test that verifies the cookie value get properly propagated from entry to return program. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 31 ++++++++++++ .../bpf/progs/uprobe_multi_session_cookie.c | 48 +++++++++++++++++++ 2 files changed, 79 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_= cookie.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index aaafd80623c5..edb71b9293c9 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -7,6 +7,7 @@ #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" #include "uprobe_multi_session.skel.h" +#include "uprobe_multi_session_cookie.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -660,6 +661,34 @@ static void test_session_skel_api(void) uprobe_multi_session__destroy(skel); } =20 +static void test_session_cookie_skel_api(void) +{ + struct uprobe_multi_session_cookie *skel =3D NULL; + int err; + + skel =3D uprobe_multi_session_cookie__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_cookie__open_and_load")) + goto cleanup; + + skel->bss->pid =3D getpid(); + + err =3D uprobe_multi_session_cookie__attach(skel); + if (!ASSERT_OK(err, "uprobe_multi_session_cookie__attach")) + goto cleanup; + + /* trigger all probes */ + uprobe_multi_func_1(); + uprobe_multi_func_2(); + uprobe_multi_func_3(); + + ASSERT_EQ(skel->bss->test_uprobe_1_result, 1, "test_uprobe_1_result"); + ASSERT_EQ(skel->bss->test_uprobe_2_result, 2, "test_uprobe_2_result"); + ASSERT_EQ(skel->bss->test_uprobe_3_result, 3, "test_uprobe_3_result"); + +cleanup: + uprobe_multi_session_cookie__destroy(skel); +} + static void test_bench_attach_uprobe(void) { long attach_start_ns =3D 0, attach_end_ns =3D 0; @@ -750,4 +779,6 @@ void test_uprobe_multi_test(void) test_attach_api_fails(); if (test__start_subtest("session")) test_session_skel_api(); + if (test__start_subtest("session_cookie")) + test_session_cookie_skel_api(); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.= c b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c new file mode 100644 index 000000000000..5befdf944dc6 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include "bpf_kfuncs.h" + +char _license[] SEC("license") =3D "GPL"; + +int pid =3D 0; + +__u64 test_uprobe_1_result =3D 0; +__u64 test_uprobe_2_result =3D 0; +__u64 test_uprobe_3_result =3D 0; + +static int check_cookie(__u64 val, __u64 *result) +{ + __u64 *cookie; + + if (bpf_get_current_pid_tgid() >> 32 !=3D pid) + return 1; + + cookie =3D bpf_session_cookie(); + + if (bpf_session_is_return()) + *result =3D *cookie =3D=3D val ? val : 0; + else + *cookie =3D val; + return 0; +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1") +int uprobe_1(struct pt_regs *ctx) +{ + return check_cookie(1, &test_uprobe_1_result); +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_2") +int uprobe_2(struct pt_regs *ctx) +{ + return check_cookie(2, &test_uprobe_2_result); +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_3") +int uprobe_3(struct pt_regs *ctx) +{ + return check_cookie(3, &test_uprobe_3_result); +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CF7D150990; Tue, 17 Sep 2024 08:52:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563155; cv=none; b=ZT8w0vzDKJSug2WY5LUa6dtI7SEmZE1XxEyZhwgo72X8DH/4nk7NmwFPcTCo0Z47cUfJVRyQPl1ACzVr26zQFf+nmq2mXQjnmvQcq/+D6DawB12QpaLxbnqIsHvERzfYVoDjft5lzlbsBojFFAkZHOZ0pz6C/NmmFix61AqCSJg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563155; c=relaxed/simple; bh=o5G3C6WMoU6yO9CqkFrppMqxyWffxeO/aOo1UWO348E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LxHktAPSGYZLLFcyJoxyZ/T4bSBljEcu7AZJmHE7uE1Ix86prlfbbsOWkgaovGuhjkhaEEcBMqryMH+0oaF7YJ3KckvGLwcXCo1uTJPFvug4Q0I+R/aebKVC4uoomn//KEmTLQ/9D+GzPxDzhyDrpxa9V5L8CdRbY3hei6BWn64= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I+iNDpD0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I+iNDpD0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9B1FC4CEC5; Tue, 17 Sep 2024 08:52:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563155; bh=o5G3C6WMoU6yO9CqkFrppMqxyWffxeO/aOo1UWO348E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I+iNDpD0rBoX7mIs/ZQHWgLFRJsyd7Pnvjsx1TzQwCHWKaV5M3HB+R4htpfrE2CHG d+pIhcSQKsOmf+mxI/+F1n3EyS4fSPdGrKvRGpKjY4z/VpSG4PR+UBSsHexrAmryqd Sle3RqvikIThJRiQHAClHFhxrmbo7tspyys9vMyKw46pR3277zbnDv0Kh8jpImuDtD b9IQ/7XbSdpPHm2GeSBaw7opGv6vnaIlCCHJeXlfMRLC6RqDNpvU0rNNYhofWbDkU6 ZHCtgpkiLrShho8+GCLoLi+oUYjmy5TSHJMgTCdabdgVUS7R1fVo7EKR9wPEcddbhv O2xB7KdPr7aYQ== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 10/14] selftests/bpf: Add uprobe session recursive test Date: Tue, 17 Sep 2024 10:50:20 +0200 Message-ID: <20240917085024.765883-11-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adding uprobe session test that verifies the cookie value is stored properly when single uprobe-ed function is executed recursively. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 57 +++++++++++++++++++ .../progs/uprobe_multi_session_recursive.c | 44 ++++++++++++++ 2 files changed, 101 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_= recursive.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index edb71b9293c9..39d505f27784 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -8,6 +8,7 @@ #include "uprobe_multi_usdt.skel.h" #include "uprobe_multi_session.skel.h" #include "uprobe_multi_session_cookie.skel.h" +#include "uprobe_multi_session_recursive.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -34,6 +35,12 @@ noinline void usdt_trigger(void) STAP_PROBE(test, pid_filter_usdt); } =20 +noinline void uprobe_session_recursive(int i) +{ + if (i) + uprobe_session_recursive(i - 1); +} + struct child { int go[2]; int c2p[2]; /* child -> parent channel */ @@ -689,6 +696,54 @@ static void test_session_cookie_skel_api(void) uprobe_multi_session_cookie__destroy(skel); } =20 +static void test_session_recursive_skel_api(void) +{ + struct uprobe_multi_session_recursive *skel =3D NULL; + int i, err; + + skel =3D uprobe_multi_session_recursive__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_recursive__open_and_load")) + goto cleanup; + + skel->bss->pid =3D getpid(); + + err =3D uprobe_multi_session_recursive__attach(skel); + if (!ASSERT_OK(err, "uprobe_multi_session_recursive__attach")) + goto cleanup; + + for (i =3D 0; i < ARRAY_SIZE(skel->bss->test_uprobe_cookie_entry); i++) + skel->bss->test_uprobe_cookie_entry[i] =3D i + 1; + + uprobe_session_recursive(5); + + /* + * entry uprobe: + * uprobe_session_recursive(5) { *cookie =3D 1, return 0 + * uprobe_session_recursive(4) { *cookie =3D 2, return 1 + * uprobe_session_recursive(3) { *cookie =3D 3, return 0 + * uprobe_session_recursive(2) { *cookie =3D 4, return 1 + * uprobe_session_recursive(1) { *cookie =3D 5, return 0 + * uprobe_session_recursive(0) { *cookie =3D 6, return 1 + * return uprobe: + * } i =3D 0 not executed + * } i =3D 1 test_uprobe_cookie_return= [0] =3D 5 + * } i =3D 2 not executed + * } i =3D 3 test_uprobe_cookie_return= [1] =3D 3 + * } i =3D 4 not executed + * } i =3D 5 test_uprobe_cookie_return= [2] =3D 1 + */ + + ASSERT_EQ(skel->bss->idx_entry, 6, "idx_entry"); + ASSERT_EQ(skel->bss->idx_return, 3, "idx_return"); + + ASSERT_EQ(skel->bss->test_uprobe_cookie_return[0], 5, "test_uprobe_cookie= _return[0]"); + ASSERT_EQ(skel->bss->test_uprobe_cookie_return[1], 3, "test_uprobe_cookie= _return[1]"); + ASSERT_EQ(skel->bss->test_uprobe_cookie_return[2], 1, "test_uprobe_cookie= _return[2]"); + +cleanup: + uprobe_multi_session_recursive__destroy(skel); +} + static void test_bench_attach_uprobe(void) { long attach_start_ns =3D 0, attach_end_ns =3D 0; @@ -781,4 +836,6 @@ void test_uprobe_multi_test(void) test_session_skel_api(); if (test__start_subtest("session_cookie")) test_session_cookie_skel_api(); + if (test__start_subtest("session_cookie_recursive")) + test_session_recursive_skel_api(); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursi= ve.c b/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c new file mode 100644 index 000000000000..8fbcd69fae22 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include "bpf_kfuncs.h" +#include "bpf_misc.h" + +char _license[] SEC("license") =3D "GPL"; + +int pid =3D 0; + +int idx_entry =3D 0; +int idx_return =3D 0; + +__u64 test_uprobe_cookie_entry[6]; +__u64 test_uprobe_cookie_return[3]; + +static int check_cookie(void) +{ + __u64 *cookie =3D bpf_session_cookie(); + + if (bpf_session_is_return()) { + if (idx_return >=3D ARRAY_SIZE(test_uprobe_cookie_return)) + return 1; + test_uprobe_cookie_return[idx_return++] =3D *cookie; + return 0; + } + + if (idx_entry >=3D ARRAY_SIZE(test_uprobe_cookie_entry)) + return 1; + *cookie =3D test_uprobe_cookie_entry[idx_entry]; + return idx_entry++ % 2; +} + + +SEC("uprobe.session//proc/self/exe:uprobe_session_recursive") +int uprobe_recursive(struct pt_regs *ctx) +{ + if (bpf_get_current_pid_tgid() >> 32 !=3D pid) + return 1; + + return check_cookie(); +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B35D51531DB; 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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XZS//yoc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBE47C4CEC5; Tue, 17 Sep 2024 08:52:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563166; bh=T3RMf23E4F/2hFMp057R2xW1km127UKxzkjsQAUmI2E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XZS//yocn1Pf4rp0yfugVhRLXdZ09IDB31UNchDvzVGkbIdH1az6Ye5GxDmskttLN cWjxvleN+xvzVk7kP+dzVM3H2nhZImsOpREvQVk5abYnquR2bwxDDFYg/a4RipC1XZ QjinVG06hVkpgTnduHj/+Cbc03+nBK/GUJVrYWcEzT9T/zEsd/LKBA/WXn03zx47BY 09ZUScz2V9wL9WC8saoERqXWl92QhOl5yjEF+sjtKckQ30b5K1RWVAFXOiteYUKOF6 cFa2G7twREbQ4G5ZcLwDAFd9Qc5Z8NWXaANhLUqx7mdUHqa8FTOQ8Z1wcEycnu+RX4 +q9kCuIQCqwtA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 11/14] selftests/bpf: Add uprobe session verifier test for return value Date: Tue, 17 Sep 2024 10:50:21 +0200 Message-ID: <20240917085024.765883-12-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Making sure uprobe.session program can return only [0,1] values. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 2 ++ .../bpf/progs/uprobe_multi_verifier.c | 31 +++++++++++++++++++ 2 files changed, 33 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_verifier= .c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index 39d505f27784..210cdb620ee0 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -9,6 +9,7 @@ #include "uprobe_multi_session.skel.h" #include "uprobe_multi_session_cookie.skel.h" #include "uprobe_multi_session_recursive.skel.h" +#include "uprobe_multi_verifier.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" #include "../sdt.h" @@ -838,4 +839,5 @@ void test_uprobe_multi_test(void) test_session_cookie_skel_api(); if (test__start_subtest("session_cookie_recursive")) test_session_recursive_skel_api(); + RUN_TESTS(uprobe_multi_verifier); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c b/to= ols/testing/selftests/bpf/progs/uprobe_multi_verifier.c new file mode 100644 index 000000000000..fe49f2cb5360 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include +#include +#include +#include "bpf_misc.h" + +char _license[] SEC("license") =3D "GPL"; + + +SEC("uprobe.session") +__success +int uprobe_sesison_return_0(struct pt_regs *ctx) +{ + return 0; +} + +SEC("uprobe.session") +__success +int uprobe_sesison_return_1(struct pt_regs *ctx) +{ + return 1; +} + +SEC("uprobe.session") +__failure +__msg("At program exit the register R0 has smin=3D2 smax=3D2 should have b= een in [0, 1]") +int uprobe_sesison_return_2(struct pt_regs *ctx) +{ + return 2; +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 20C05159583; Tue, 17 Sep 2024 08:52:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563179; cv=none; b=CybaBH3UhjBGPSSKMNvb5gh3Ep9sZxfAiIiagKRr5xu0mOFZ3+iJeoYbKiQIAEqAdUwmKMvN/uKZEpk2yekW+sfza+uXyNDv8aRYCG906c3HKz1tXefJIBZtlB2UyauZ8bxmdB5AebAlSP+NRe9aoZKWTsob/yG3053G+R0o8UI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563179; c=relaxed/simple; bh=bHVTr5EPCLxzQcKYcQIlZE5IAbxRZPb3gBZhMsGQwFE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hZxrCoVaYwy6lHuFkr9734dR90FSGJ0dzAUu4aFUFI/5K0QqFzQJ6Vro2/W8agVK2ZHcxF1ollgdp5jwxIAMLGc8ZnbnI4tbc00naDeBrVU8fDPedKR/OBNaK/FIHnQ1j83byxACEKnLJDhlvTYL4L2QLTNehUI2POCwjx1uowY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gE73Wtr4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gE73Wtr4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB454C4CEC5; Tue, 17 Sep 2024 08:52:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563179; bh=bHVTr5EPCLxzQcKYcQIlZE5IAbxRZPb3gBZhMsGQwFE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gE73Wtr4SKaUEP5tS9jKRnim3fmTqUcw4a+PADsWDeqb/EQGzxLoenRUWsBy4CyAc cC1YMTOsxzVzSPIVvZx4O6Oz401rCOzKhd35gu0eqUrSZRUbrL60jJMCjugWxdc+33 6cb3+ajsYrcS2ODC/WFDC2NTJNz8/AI8BlJFIlY3PoVZ9LTZTAKbpTBtmAm/5gNjIE aopO1FMNJ/mV1AvBaeupSrMumV/HZ6RjpBbkcJes/5lki0T3O0CONQiXqGjuQqPTv/ rEZDMAU2FSkOEq890H1vCAmSKO2V9KaFbzNKVi4pdGLcc7VlpRwjrvLVomT6/GUu7B rrldi7I8xzZuQ== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 12/14] selftests/bpf: Add kprobe session verifier test for return value Date: Tue, 17 Sep 2024 10:50:22 +0200 Message-ID: <20240917085024.765883-13-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Making sure kprobe.session program can return only [0,1] values. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/kprobe_multi_test.c | 2 ++ .../bpf/progs/kprobe_multi_verifier.c | 31 +++++++++++++++++++ 2 files changed, 33 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_verifier= .c diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c index 960c9323d1e0..66ab1cae923e 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c @@ -6,6 +6,7 @@ #include "kprobe_multi_override.skel.h" #include "kprobe_multi_session.skel.h" #include "kprobe_multi_session_cookie.skel.h" +#include "kprobe_multi_verifier.skel.h" #include "bpf/libbpf_internal.h" #include "bpf/hashmap.h" =20 @@ -764,4 +765,5 @@ void test_kprobe_multi_test(void) test_session_skel_api(); if (test__start_subtest("session_cookie")) test_session_cookie_skel_api(); + RUN_TESTS(kprobe_multi_verifier); } diff --git a/tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c b/to= ols/testing/selftests/bpf/progs/kprobe_multi_verifier.c new file mode 100644 index 000000000000..288577e81deb --- /dev/null +++ b/tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include +#include +#include +#include "bpf_misc.h" + +char _license[] SEC("license") =3D "GPL"; + + +SEC("kprobe.session") +__success +int kprobe_session_return_0(struct pt_regs *ctx) +{ + return 0; +} + +SEC("kprobe.session") +__success +int kprobe_session_return_1(struct pt_regs *ctx) +{ + return 1; +} + +SEC("kprobe.session") +__failure +__msg("At program exit the register R0 has smin=3D2 smax=3D2 should have b= een in [0, 1]") +int kprobe_session_return_2(struct pt_regs *ctx) +{ + return 2; +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC36415B561; Tue, 17 Sep 2024 08:53:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563190; cv=none; b=KtWSWtgo9f8TNke/+583m+aaUy5ws72aSdIkjNxPTKl5jwm3JhY5kG3Ym126PdqYFhu0K0idWl2KOr6Q9unJub0E+qPy9G4/ZjooZLkpxMZ0Odh/OHvjCjOhFZbglvRkDkt8BqMgxpMu6bH90yzm9TaGudlqGWtoKV1rClSQzUY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726563190; c=relaxed/simple; bh=ShXB489+gH5xzNqGVywABGETB3D2nsBgIplRythHk90=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JzNEQVUvyzYA5V9uum1qKOASVyq5Ip7NUbw1kvipCd9XOx9zNLrydCNX5QUFiDlg7iXGbaMs5w12epHvi2B4LPcEIMF7wdQvx6Fz+41YGkdfFpYh1zJMvWO5RGbdJJmjK4lE7HvD8WKWEWZ/s/ctBY68HS6mhGomq7VBcmu3zpU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PmEa9k5f; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PmEa9k5f" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 394B0C4CEC5; Tue, 17 Sep 2024 08:53:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563190; bh=ShXB489+gH5xzNqGVywABGETB3D2nsBgIplRythHk90=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PmEa9k5fuW96PPW4IIaDFygX4DTRCbo16wBnKl84PD3kdVGkf4agtbZuPD1BIDkgk uDU9L5XoenaE+taNxmR8MqZrqwiDY8acguAJLsl7OaYgrNMuaCwuDyjVy5J3YTxuY9 VDV6okRnIMYVjYoJFcrHd5sOg9MHAvsUxucQt7MRsA6fITUKA7reE+4SweYJnwrUNW OZL0cH8lH1cKWCYWL9WrmDJ2nh/v9ZzamWgQo9paTpHOJi4HCmKOe0xbfWB2w2EbdP PQj+56dG1S4lDnl6uhFpsXGQTPOQ9mKdh+IjnZBuHmIQCqyj4drLDzdqPrnwX9tDWm qEl6AwMx7suOw== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 13/14] selftests/bpf: Add uprobe session single consumer test Date: Tue, 17 Sep 2024 10:50:23 +0200 Message-ID: <20240917085024.765883-14-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Testing that the session ret_handler bypass works on single uprobe with multiple consumers, each with different session ignore return value. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 33 ++++++++++++++ .../bpf/progs/uprobe_multi_session_single.c | 44 +++++++++++++++++++ 2 files changed, 77 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_= single.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index 210cdb620ee0..594aa8c06f58 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -7,6 +7,7 @@ #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" #include "uprobe_multi_session.skel.h" +#include "uprobe_multi_session_single.skel.h" #include "uprobe_multi_session_cookie.skel.h" #include "uprobe_multi_session_recursive.skel.h" #include "uprobe_multi_verifier.skel.h" @@ -669,6 +670,36 @@ static void test_session_skel_api(void) uprobe_multi_session__destroy(skel); } =20 +static void test_session_single_skel_api(void) +{ + struct uprobe_multi_session_single *skel =3D NULL; + LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); + int err; + + skel =3D uprobe_multi_session_single__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_session_single__open_and_load")) + goto cleanup; + + skel->bss->pid =3D getpid(); + + err =3D uprobe_multi_session_single__attach(skel); + if (!ASSERT_OK(err, "uprobe_multi_session_single__attach")) + goto cleanup; + + uprobe_multi_func_1(); + + /* + * We expect consumer 0 and 2 to trigger just entry handler (value 1) + * and consumer 1 to hit both (value 2). + */ + ASSERT_EQ(skel->bss->uprobe_session_result[0], 1, "uprobe_session_result_= 0"); + ASSERT_EQ(skel->bss->uprobe_session_result[1], 2, "uprobe_session_result_= 1"); + ASSERT_EQ(skel->bss->uprobe_session_result[2], 1, "uprobe_session_result_= 2"); + +cleanup: + uprobe_multi_session_single__destroy(skel); +} + static void test_session_cookie_skel_api(void) { struct uprobe_multi_session_cookie *skel =3D NULL; @@ -835,6 +866,8 @@ void test_uprobe_multi_test(void) test_attach_api_fails(); if (test__start_subtest("session")) test_session_skel_api(); + if (test__start_subtest("session_single")) + test_session_single_skel_api(); if (test__start_subtest("session_cookie")) test_session_cookie_skel_api(); if (test__start_subtest("session_cookie_recursive")) diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_single.= c b/tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c new file mode 100644 index 000000000000..1fa53d3785f6 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include "bpf_kfuncs.h" +#include "bpf_misc.h" + +char _license[] SEC("license") =3D "GPL"; + +__u64 uprobe_session_result[3] =3D {}; +int pid =3D 0; + +static int uprobe_multi_check(void *ctx, bool is_return, int idx) +{ + if (bpf_get_current_pid_tgid() >> 32 !=3D pid) + return 1; + + uprobe_session_result[idx]++; + + /* only consumer 1 executes return probe */ + if (idx =3D=3D 0 || idx =3D=3D 2) + return 1; + + return 0; +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1") +int uprobe_0(struct pt_regs *ctx) +{ + return uprobe_multi_check(ctx, bpf_session_is_return(), 0); +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1") +int uprobe_1(struct pt_regs *ctx) +{ + return uprobe_multi_check(ctx, bpf_session_is_return(), 1); +} + +SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1") +int uprobe_2(struct pt_regs *ctx) +{ + return uprobe_multi_check(ctx, bpf_session_is_return(), 2); +} --=20 2.46.0 From nobody Fri Nov 29 16:47:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 932EF158550; Tue, 17 Sep 2024 08:53:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726563202; bh=7A9EdOCx4qTXb70yo06M1I8B1//8v5dhcqxszDj04s4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ichzMza1gv5xa4YKI8apJxzftQFN1F+c8zALITGUBXsfUh4JTuP9hE0xFY8d+YRuO 5enrQiEzuvbl/lfetN+Vn8Y5IRsz56oSJF0NCu9FAzeuh+C3GkMoAaME7ZoUp+PKnb z7D/JCrySOAB9YQ2cBKi0dA6uWU7iyLKfSQzNQjJ0S9Hn00+qg1KHXtimcfqMaFnzs nW7mMCu4O4TkvFlCdECDEse2XOKp7lpVlqDPHMMgjUvnnC3Qg38pEuQJQKT0a+fafp lHtu0fZ65EU0m2RpQSPo9btMlab14NymHx058wSRvRUrnoTxDuSRlmLSD3tWkmRPmn tUzFw1VZqmEkA== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Steven Rostedt , Masami Hiramatsu , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCHv4 14/14] selftests/bpf: Add consumers stress test on single uprobe Date: Tue, 17 Sep 2024 10:50:24 +0200 Message-ID: <20240917085024.765883-15-jolsa@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240917085024.765883-1-jolsa@kernel.org> References: <20240917085024.765883-1-jolsa@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" We create multiple threads each trying to attach and detach uprobe consumers on the same uprobe, while main thread is hitting on that uprobe. All that for 5 seconds. Signed-off-by: Jiri Olsa --- .../bpf/prog_tests/uprobe_multi_test.c | 82 +++++++++++++++++++ .../bpf/progs/uprobe_multi_consumer_stress.c | 29 +++++++ 2 files changed, 111 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_consumer= _stress.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/t= ools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index 594aa8c06f58..dcc128507212 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -3,6 +3,7 @@ #include #include #include +#include #include "uprobe_multi.skel.h" #include "uprobe_multi_bench.skel.h" #include "uprobe_multi_usdt.skel.h" @@ -10,6 +11,7 @@ #include "uprobe_multi_session_single.skel.h" #include "uprobe_multi_session_cookie.skel.h" #include "uprobe_multi_session_recursive.skel.h" +#include "uprobe_multi_consumer_stress.skel.h" #include "uprobe_multi_verifier.skel.h" #include "bpf/libbpf_internal.h" #include "testing_helpers.h" @@ -848,6 +850,84 @@ static void test_bench_attach_usdt(void) printf("%s: detached in %7.3lfs\n", __func__, detach_delta); } =20 +static int done; + +static void *worker(void *p) +{ + struct uprobe_multi_consumer_stress *skel =3D p; + struct bpf_link *link =3D NULL; + + srand(time(NULL)); + + while (!done) { + LIBBPF_OPTS(bpf_uprobe_multi_opts, opts); + struct bpf_program *prog; + + switch (rand() % 4) { + case 0: + prog =3D skel->progs.uprobe_session_0; + opts.session =3D true; + break; + case 1: + prog =3D skel->progs.uprobe_session_1; + opts.session =3D true; + break; + case 2: + prog =3D skel->progs.uprobe; + break; + case 3: + prog =3D skel->progs.uretprobe; + opts.retprobe =3D true; + break; + } + + link =3D bpf_program__attach_uprobe_multi(prog, -1, "/proc/self/exe", + "uprobe_multi_func_1", &opts); + bpf_link__destroy(link); + } + + return NULL; +} + +#define THREAD_COUNT 4 + +static void test_session_consumer_stress(void) +{ + struct uprobe_multi_consumer_stress *skel; + pthread_t threads[THREAD_COUNT]; + time_t start; + int i, err; + + /* + * We create multiple threads each trying to attach and detach uprobe + * consumer on the same uprobe, while main thread is hitting on that + * uprobe. All that for 5 seconds. + */ + skel =3D uprobe_multi_consumer_stress__open_and_load(); + if (!ASSERT_OK_PTR(skel, "uprobe_multi_consumer_stress")) + goto cleanup; + + for (i =3D 0; i < THREAD_COUNT; i++) { + err =3D pthread_create(threads + i, NULL, worker, skel); + if (!ASSERT_OK(err, "pthread_create")) + goto join; + } + + start =3D time(NULL); + + while (start + 5 > time(NULL)) + uprobe_multi_func_1(); + + done =3D 1; + +join: + for (i =3D 0; i < THREAD_COUNT; i++) + pthread_join(threads[i], NULL); + +cleanup: + uprobe_multi_consumer_stress__destroy(skel); +} + void test_uprobe_multi_test(void) { if (test__start_subtest("skel_api")) @@ -872,5 +952,7 @@ void test_uprobe_multi_test(void) test_session_cookie_skel_api(); if (test__start_subtest("session_cookie_recursive")) test_session_recursive_skel_api(); + if (test__start_subtest("consumer_stress")) + test_session_consumer_stress(); RUN_TESTS(uprobe_multi_verifier); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_consumer_stress= .c b/tools/testing/selftests/bpf/progs/uprobe_multi_consumer_stress.c new file mode 100644 index 000000000000..5390108a21ff --- /dev/null +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_consumer_stress.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +char _license[] SEC("license") =3D "GPL"; + +SEC("uprobe.session") +int uprobe_session_0(struct pt_regs *ctx) +{ + return 0; +} + +SEC("uprobe.session") +int uprobe_session_1(struct pt_regs *ctx) +{ + return 1; +} + +SEC("uprobe.multi") +int uprobe(struct pt_regs *ctx) +{ + return 0; +} + +SEC("uprobe.multi") +int uretprobe(struct pt_regs *ctx) +{ + return 0; +} --=20 2.46.0