From nobody Mon Oct 6 16:54:39 2025 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 0A6891F583A; Sun, 20 Jul 2025 11:22:37 +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=1753010559; cv=none; b=P+4cPUswAgEvSMlWSrKg9m2DBSNsrQmYvU6pHCCVNkRKXFsp+TRhAaOa2Ha6xPQuS8SkNBRQbWq4BojBnxfmbshz1IwI9xqMtBCGyp4jcpwcMwdlnmo71vLzICFQvEM9zlAQpy5fzzxA694SWm5Whld90koStbwlsb1X+bYXiH8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753010559; c=relaxed/simple; bh=pjYT/IhZlosUUefa9VDVhy5RRhEl7R5RQwHD6inb1WM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VOQyEGpuGjODLVaqt55cmoaqmQnnEKccfjJ3bA+futoL+GiepXZewYTkYQIL3x0VEoazeVNFgQ0MP4dufIXVdQ+o10yz1stRAiNkNeH8iAGJKVurYoetXHXIqGOrF04sX38/a8dDPmfMszAqoXnDCXbJJL0rBIqxLsM1kI8mPgg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ye/X5UCT; 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="Ye/X5UCT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6E4F8C4CEE7; Sun, 20 Jul 2025 11:22:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753010557; bh=pjYT/IhZlosUUefa9VDVhy5RRhEl7R5RQwHD6inb1WM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ye/X5UCT54Y8YVKJYPxqITH6rHXFqJwn3SKZz0Na9+dVjcsAygAIseiEJ18x4N3bY BIB5srCs+akErM/3PbfC8PPGRehKK1gei5kl1jBXogiMiy0odsD78NYkwP5M+nNhp1 rq6yYl3YfxNr6KmIiJZ2gtU2n5BB/q6W1uesyEZAjtqOUtcOS+CIydBrXhT2Lvwm6W mnETRedTOMYNwRV1DIlogNeEUeTREAazJTbCInGZmkG+62KzgqdjG/fDfAz6koECBU veg4Ckl5VorEdSvsRVgJ+d9VzYO/4Tz3EM8+pKZP4LAjJgZIDF6hk4jqafqtfUclRW Ksxi8AL8ijEHQ== From: Jiri Olsa To: Oleg Nesterov , Peter Zijlstra , Andrii Nakryiko Cc: "Masami Hiramatsu (Google)" , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Hao Luo , Steven Rostedt , Alan Maguire , David Laight , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Ingo Molnar Subject: [PATCHv6 perf/core 05/22] uprobes: Add nbytes argument to uprobe_write Date: Sun, 20 Jul 2025 13:21:15 +0200 Message-ID: <20250720112133.244369-6-jolsa@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250720112133.244369-1-jolsa@kernel.org> References: <20250720112133.244369-1-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 nbytes argument to uprobe_write and related functions as preparation for writing whole instructions in following changes. Also renaming opcode arguments to insn, which seems to fit better. Acked-by: Masami Hiramatsu (Google) Acked-by: Andrii Nakryiko Acked-by: Oleg Nesterov Signed-off-by: Jiri Olsa --- include/linux/uprobes.h | 4 ++-- kernel/events/uprobes.c | 26 ++++++++++++++------------ 2 files changed, 16 insertions(+), 14 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index e13382054435..147c4a0a1af9 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -188,7 +188,7 @@ struct uprobes_state { }; =20 typedef int (*uprobe_write_verify_t)(struct page *page, unsigned long vadd= r, - uprobe_opcode_t *opcode); + uprobe_opcode_t *insn, int nbytes); =20 extern void __init uprobes_init(void); extern int set_swbp(struct arch_uprobe *aup, struct vm_area_struct *vma, u= nsigned long vaddr); @@ -199,7 +199,7 @@ extern unsigned long uprobe_get_swbp_addr(struct pt_reg= s *regs); extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs); extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area= _struct *vma, unsigned long vaddr, uprobe_opcode_t); extern int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct= *vma, const unsigned long opcode_vaddr, - uprobe_opcode_t opcode, uprobe_write_verify_t verify); + uprobe_opcode_t *insn, int nbytes, uprobe_write_verify_t verify); extern struct uprobe *uprobe_register(struct inode *inode, loff_t offset, = loff_t ref_ctr_offset, struct uprobe_consumer *uc); extern int uprobe_apply(struct uprobe *uprobe, struct uprobe_consumer *uc,= bool); extern void uprobe_unregister_nosync(struct uprobe *uprobe, struct uprobe_= consumer *uc); diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 777de9b95dd7..f7feb7417a2c 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -191,7 +191,8 @@ static void copy_to_page(struct page *page, unsigned lo= ng vaddr, const void *src kunmap_atomic(kaddr); } =20 -static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_op= code_t *new_opcode) +static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_op= code_t *insn, + int nbytes) { uprobe_opcode_t old_opcode; bool is_swbp; @@ -208,7 +209,7 @@ static int verify_opcode(struct page *page, unsigned lo= ng vaddr, uprobe_opcode_t uprobe_copy_from_page(page, vaddr, &old_opcode, UPROBE_SWBP_INSN_SIZE); is_swbp =3D is_swbp_insn(&old_opcode); =20 - if (is_swbp_insn(new_opcode)) { + if (is_swbp_insn(insn)) { if (is_swbp) /* register: already installed? */ return 0; } else { @@ -401,10 +402,10 @@ static bool orig_page_is_identical(struct vm_area_str= uct *vma, =20 static int __uprobe_write(struct vm_area_struct *vma, struct folio_walk *fw, struct folio *folio, - unsigned long opcode_vaddr, uprobe_opcode_t opcode) + unsigned long insn_vaddr, uprobe_opcode_t *insn, int nbytes) { - const unsigned long vaddr =3D opcode_vaddr & PAGE_MASK; - const bool is_register =3D !!is_swbp_insn(&opcode); + const unsigned long vaddr =3D insn_vaddr & PAGE_MASK; + const bool is_register =3D !!is_swbp_insn(insn); bool pmd_mappable; =20 /* For now, we'll only handle PTE-mapped folios. */ @@ -429,7 +430,7 @@ static int __uprobe_write(struct vm_area_struct *vma, */ flush_cache_page(vma, vaddr, pte_pfn(fw->pte)); fw->pte =3D ptep_clear_flush(vma, vaddr, fw->ptep); - copy_to_page(fw->page, opcode_vaddr, &opcode, UPROBE_SWBP_INSN_SIZE); + copy_to_page(fw->page, insn_vaddr, insn, nbytes); =20 /* * When unregistering, we may only zap a PTE if uffd is disabled and @@ -489,13 +490,14 @@ static int __uprobe_write(struct vm_area_struct *vma, int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct= *vma, const unsigned long opcode_vaddr, uprobe_opcode_t opcode) { - return uprobe_write(auprobe, vma, opcode_vaddr, opcode, verify_opcode); + return uprobe_write(auprobe, vma, opcode_vaddr, &opcode, UPROBE_SWBP_INSN= _SIZE, verify_opcode); } =20 int uprobe_write(struct arch_uprobe *auprobe, struct vm_area_struct *vma, - const unsigned long opcode_vaddr, uprobe_opcode_t opcode, uprobe_write_= verify_t verify) + const unsigned long insn_vaddr, uprobe_opcode_t *insn, int nbytes, + uprobe_write_verify_t verify) { - const unsigned long vaddr =3D opcode_vaddr & PAGE_MASK; + const unsigned long vaddr =3D insn_vaddr & PAGE_MASK; struct mm_struct *mm =3D vma->vm_mm; struct uprobe *uprobe; int ret, is_register, ref_ctr_updated =3D 0; @@ -505,7 +507,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm= _area_struct *vma, struct folio *folio; struct page *page; =20 - is_register =3D is_swbp_insn(&opcode); + is_register =3D is_swbp_insn(insn); uprobe =3D container_of(auprobe, struct uprobe, arch); =20 if (WARN_ON_ONCE(!is_cow_mapping(vma->vm_flags))) @@ -528,7 +530,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm= _area_struct *vma, goto out; folio =3D page_folio(page); =20 - ret =3D verify(page, opcode_vaddr, &opcode); + ret =3D verify(page, insn_vaddr, insn, nbytes); if (ret <=3D 0) { folio_put(folio); goto out; @@ -567,7 +569,7 @@ int uprobe_write(struct arch_uprobe *auprobe, struct vm= _area_struct *vma, /* Walk the page tables again, to perform the actual update. */ if (folio_walk_start(&fw, vma, vaddr, 0)) { if (fw.page =3D=3D page) - ret =3D __uprobe_write(vma, &fw, folio, opcode_vaddr, opcode); + ret =3D __uprobe_write(vma, &fw, folio, insn_vaddr, insn, nbytes); folio_walk_end(&fw, vma); } =20 --=20 2.50.1