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Mon, 30 Sep 2024 09:33:13 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id MLB8Allw+mayMAAAD6G6ig (envelope-from ); Mon, 30 Sep 2024 09:33:13 +0000 From: Michael Vetter To: linux-kselftest@vger.kernel.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michael Vetter Subject: [PATCH v4 1/3] selftests: livepatch: rename KLP_SYSFS_DIR to SYSFS_KLP_DIR Date: Mon, 30 Sep 2024 11:33:06 +0200 Message-ID: <20240930093308.65103-2-mvetter@suse.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20240930093308.65103-1-mvetter@suse.com> References: <20240930093308.65103-1-mvetter@suse.com> 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 X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:mid,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Score: -2.80 X-Spam-Flag: NO Content-Type: text/plain; charset="utf-8" This naming makes more sense according to the directory structure. Especially when we later add more paths. Signed-off-by: Michael Vetter Reviewed-by: Marcos Paulo de Souza --- tools/testing/selftests/livepatch/functions.sh | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing= /selftests/livepatch/functions.sh index fc4c6a016d38..50361fceff06 100644 --- a/tools/testing/selftests/livepatch/functions.sh +++ b/tools/testing/selftests/livepatch/functions.sh @@ -6,7 +6,7 @@ =20 MAX_RETRIES=3D600 RETRY_INTERVAL=3D".1" # seconds -KLP_SYSFS_DIR=3D"/sys/kernel/livepatch" +SYSFS_KLP_DIR=3D"/sys/kernel/livepatch" =20 # Kselftest framework requirement - SKIP code is 4 ksft_skip=3D4 @@ -322,7 +322,7 @@ function check_sysfs_rights() { local rel_path=3D"$1"; shift local expected_rights=3D"$1"; shift =20 - local path=3D"$KLP_SYSFS_DIR/$mod/$rel_path" + local path=3D"$SYSFS_KLP_DIR/$mod/$rel_path" local rights=3D$(/bin/stat --format '%A' "$path") if test "$rights" !=3D "$expected_rights" ; then die "Unexpected access rights of $path: $expected_rights vs. $rights" @@ -338,7 +338,7 @@ function check_sysfs_value() { local rel_path=3D"$1"; shift local expected_value=3D"$1"; shift =20 - local path=3D"$KLP_SYSFS_DIR/$mod/$rel_path" + local path=3D"$SYSFS_KLP_DIR/$mod/$rel_path" local value=3D`cat $path` if test "$value" !=3D "$expected_value" ; then die "Unexpected value in $path: $expected_value vs. $value" --=20 2.46.1 From nobody Thu Nov 28 15:56:38 2024 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4016C18B46E; Mon, 30 Sep 2024 09:33:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727688798; cv=none; b=ZuZMtxe4xjEFFZAwmyeClk5trqqddcxSiJhpKgB7Kl85DarJqOAM1F57M2ppSwpBFdRJwrUzLWe/NxVPXR20F/nY7w0Zsh6YWZBzFm4ns0lbcQ9YHyX7vltRvA1IxJlp9hz7aTGkJbvGNxXvSM4CcSEL6gs1Mpeqdp9tcciQy9s= ARC-Message-Signature: i=1; a=rsa-sha256; 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BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:email,imap1.dmz-prg2.suse.org:helo]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Level: Content-Type: text/plain; charset="utf-8" Save the state of /sys/kernel/debug/kprobes/enabled during setup_config() and restore it during cleanup(). This is in preparation for a future commit that will add a test that should confirm that we cannot livepatch a kprobed function if that kprobe has a post handler. Signed-off-by: Michael Vetter Reviewed-by: Marcos Paulo de Souza --- tools/testing/selftests/livepatch/functions.sh | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing= /selftests/livepatch/functions.sh index 50361fceff06..91102562db58 100644 --- a/tools/testing/selftests/livepatch/functions.sh +++ b/tools/testing/selftests/livepatch/functions.sh @@ -6,7 +6,10 @@ =20 MAX_RETRIES=3D600 RETRY_INTERVAL=3D".1" # seconds -SYSFS_KLP_DIR=3D"/sys/kernel/livepatch" +SYSFS_KERNEL_DIR=3D"/sys/kernel" +SYSFS_KLP_DIR=3D"$SYSFS_KERNEL_DIR/livepatch" +SYSFS_DEBUG_DIR=3D"$SYSFS_KERNEL_DIR/debug" +SYSFS_KPROBES_DIR=3D"$SYSFS_DEBUG_DIR/kprobes" =20 # Kselftest framework requirement - SKIP code is 4 ksft_skip=3D4 @@ -55,22 +58,26 @@ function die() { } =20 function push_config() { - DYNAMIC_DEBUG=3D$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debu= g/control | \ + DYNAMIC_DEBUG=3D$(grep '^kernel/livepatch' "$SYSFS_DEBUG_DIR/dynamic_debu= g/control" | \ awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}') FTRACE_ENABLED=3D$(sysctl --values kernel.ftrace_enabled) + KPROBE_ENABLED=3D$(cat "$SYSFS_KPROBES_DIR/enabled") } =20 function pop_config() { if [[ -n "$DYNAMIC_DEBUG" ]]; 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Mon, 30 Sep 2024 09:33:15 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id gBLnNVtw+mayMAAAD6G6ig (envelope-from ); Mon, 30 Sep 2024 09:33:15 +0000 From: Michael Vetter To: linux-kselftest@vger.kernel.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michael Vetter Subject: [PATCH v4 3/3] selftests: livepatch: test livepatching a kprobed function Date: Mon, 30 Sep 2024 11:33:08 +0200 Message-ID: <20240930093308.65103-4-mvetter@suse.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20240930093308.65103-1-mvetter@suse.com> References: <20240930093308.65103-1-mvetter@suse.com> 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 X-Rspamd-Queue-Id: 316491FB9F X-Spam-Level: X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.com:email,suse.com:dkim,suse.com:mid]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[suse.com:+] X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Score: -3.01 X-Spam-Flag: NO Content-Type: text/plain; charset="utf-8" The test proves that a function that is being kprobed and uses a post_handler cannot be livepatched. Only one ftrace_ops with FTRACE_OPS_FL_IPMODIFY set may be registered to any given function at a time. Signed-off-by: Michael Vetter Reviewed-by: Marcos Paulo de Souza --- tools/testing/selftests/livepatch/Makefile | 3 +- .../selftests/livepatch/test-kprobe.sh | 62 +++++++++++++++++++ .../selftests/livepatch/test_modules/Makefile | 3 +- .../livepatch/test_modules/test_klp_kprobe.c | 38 ++++++++++++ 4 files changed, 104 insertions(+), 2 deletions(-) create mode 100755 tools/testing/selftests/livepatch/test-kprobe.sh create mode 100644 tools/testing/selftests/livepatch/test_modules/test_klp= _kprobe.c diff --git a/tools/testing/selftests/livepatch/Makefile b/tools/testing/sel= ftests/livepatch/Makefile index 35418a4790be..a080eb54a215 100644 --- a/tools/testing/selftests/livepatch/Makefile +++ b/tools/testing/selftests/livepatch/Makefile @@ -10,7 +10,8 @@ TEST_PROGS :=3D \ test-state.sh \ test-ftrace.sh \ test-sysfs.sh \ - test-syscall.sh + test-syscall.sh \ + test-kprobe.sh =20 TEST_FILES :=3D settings =20 diff --git a/tools/testing/selftests/livepatch/test-kprobe.sh b/tools/testi= ng/selftests/livepatch/test-kprobe.sh new file mode 100755 index 000000000000..115065156016 --- /dev/null +++ b/tools/testing/selftests/livepatch/test-kprobe.sh @@ -0,0 +1,62 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2024 SUSE +# Author: Michael Vetter + +. $(dirname $0)/functions.sh + +MOD_LIVEPATCH=3Dtest_klp_livepatch +MOD_KPROBE=3Dtest_klp_kprobe + +setup_config + +# Kprobe a function and verify that we can't livepatch that same function +# when it uses a post_handler since only one IPMODIFY maybe be registered +# to any given function at a time. + +start_test "livepatch interaction with kprobed function with post_handler" + +echo 1 > "$SYSFS_KPROBES_DIR/enabled" + +load_mod $MOD_KPROBE has_post_handler=3Dtrue +load_failing_mod $MOD_LIVEPATCH +unload_mod $MOD_KPROBE + +check_result "% insmod test_modules/test_klp_kprobe.ko has_post_handler=3D= true +% insmod test_modules/$MOD_LIVEPATCH.ko +livepatch: enabling patch '$MOD_LIVEPATCH' +livepatch: '$MOD_LIVEPATCH': initializing patching transition +livepatch: failed to register ftrace handler for function 'cmdline_proc_sh= ow' (-16) +livepatch: failed to patch object 'vmlinux' +livepatch: failed to enable patch '$MOD_LIVEPATCH' +livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpat= ch +livepatch: '$MOD_LIVEPATCH': completing unpatching transition +livepatch: '$MOD_LIVEPATCH': unpatching complete +insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Dev= ice or resource busy +% rmmod test_klp_kprobe" + +start_test "livepatch interaction with kprobed function without post_handl= er" + +load_mod $MOD_KPROBE has_post_handler=3Dfalse +load_lp $MOD_LIVEPATCH + +unload_mod $MOD_KPROBE +disable_lp $MOD_LIVEPATCH +unload_lp $MOD_LIVEPATCH + +check_result "% insmod test_modules/test_klp_kprobe.ko has_post_handler=3D= false +% insmod test_modules/$MOD_LIVEPATCH.ko +livepatch: enabling patch '$MOD_LIVEPATCH' +livepatch: '$MOD_LIVEPATCH': initializing patching transition +livepatch: '$MOD_LIVEPATCH': starting patching transition +livepatch: '$MOD_LIVEPATCH': completing patching transition +livepatch: '$MOD_LIVEPATCH': patching complete +% rmmod test_klp_kprobe +% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled +livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +livepatch: '$MOD_LIVEPATCH': starting unpatching transition +livepatch: '$MOD_LIVEPATCH': completing unpatching transition +livepatch: '$MOD_LIVEPATCH': unpatching complete +% rmmod $MOD_LIVEPATCH" + +exit 0 diff --git a/tools/testing/selftests/livepatch/test_modules/Makefile b/tool= s/testing/selftests/livepatch/test_modules/Makefile index e6e638c4bcba..939230e571f5 100644 --- a/tools/testing/selftests/livepatch/test_modules/Makefile +++ b/tools/testing/selftests/livepatch/test_modules/Makefile @@ -6,11 +6,12 @@ obj-m +=3D test_klp_atomic_replace.o \ test_klp_callbacks_demo.o \ test_klp_callbacks_demo2.o \ test_klp_callbacks_mod.o \ + test_klp_kprobe.o \ test_klp_livepatch.o \ + test_klp_shadow_vars.o \ test_klp_state.o \ test_klp_state2.o \ test_klp_state3.o \ - test_klp_shadow_vars.o \ test_klp_syscall.o =20 # Ensure that KDIR exists, otherwise skip the compilation diff --git a/tools/testing/selftests/livepatch/test_modules/test_klp_kprobe= .c b/tools/testing/selftests/livepatch/test_modules/test_klp_kprobe.c new file mode 100644 index 000000000000..67a8d29012f6 --- /dev/null +++ b/tools/testing/selftests/livepatch/test_modules/test_klp_kprobe.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2024 Marcos Paulo de Souza +// Copyright (C) 2024 Michael Vetter + +#include +#include +#include + +static bool has_post_handler =3D true; +module_param(has_post_handler, bool, 0444); + +static void __kprobes post_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ +} + +static struct kprobe kp =3D { + .symbol_name =3D "cmdline_proc_show", +}; + +static int __init kprobe_init(void) +{ + if (has_post_handler) + kp.post_handler =3D post_handler; + + return register_kprobe(&kp); +} + +static void __exit kprobe_exit(void) +{ + unregister_kprobe(&kp); +} + +module_init(kprobe_init) +module_exit(kprobe_exit) +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Vetter "); +MODULE_DESCRIPTION("Livepatch test: kprobe function"); --=20 2.46.1