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Thu, 28 May 2026 23:50:31 -0700 (PDT) Received: from [127.0.1.1] ([104.28.157.202]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc0c1ab21sm952626a91.14.2026.05.28.23.50.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 23:50:31 -0700 (PDT) Subject: [PATCH 4/6] perf/header: add bounds check for domain index in process_cpu_domain_info From: Wang Haoran To: acme@kernel.org Cc: peterz@infradead.org, mingo@redhat.com, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, haoranwangsec@gmail.com Date: Fri, 29 May 2026 14:50:22 +0800 Message-ID: <178003742265.62097.6645230837884864368@gmail.com> In-Reply-To: <178003738371.62097.10360938456907564684@gmail.com> References: <178003738371.62097.10360938456907564684@gmail.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8701719228398729701==" --===============8701719228398729701== Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable >>From 6558dce0d11d81872d73655bc8290cfb1dc499b2 Mon Sep 17 00:00:00 2001 From: Wang Haoran Date: Thu, 28 May 2026 15:17:21 +0800 Subject: [PATCH 4/6] perf/header: add bounds check for domain index in process_cpu_domain_info process_cpu_domain_info() reads a domain index from the file and uses it directly as an array index into cd_map[cpu]->domains[], which has max_sched_domains entries. A crafted file can supply a domain value >=3D max_sched_domains, causing an out-of-bounds write. Add a bounds check that rejects domain values outside the valid range. Free the just-allocated d_info before returning to avoid a memory leak. Fixes: Signed-off-by: Wang Haoran --- tools/perf/util/header.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index f1a1831cf..6281e97ee 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -3670,6 +3670,11 @@ static int process_cpu_domain_info(struct feat_fd *ff,= void *data __maybe_unused if (!d_info) return -1; =20 + if (domain >=3D max_sched_domains) { + free(d_info); + return -1; + } + assert(cd_map[cpu]->domains[domain] =3D=3D NULL); cd_map[cpu]->domains[domain] =3D d_info; d_info->domain =3D domain; --=20 2.53.0 --- ASan output on perf 7.0.6 (unpatched) with the attached PoC: AddressSanitizer:DEADLYSIGNAL =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D55941=3D=3DERROR: AddressSanitizer: SEGV on unknown address 0x729c3fbe0= 790 (pc 0x5e98934d9c97 bp 0x7ffd2f046790 sp 0x7ffd2f046650 T0) =3D=3D55941=3D=3DThe signal is caused by a WRITE memory access. #0 0x5e98934d9c97 in process_cpu_domain_info (perf+0x610c97) (BuildId: 25= d667fa7a7274046cb5bcb3375c4b1074f3f6db) #1 0x5e98934c6698 in perf_file_section__process (perf+0x5fd698) (BuildId:= 25d667fa7a7274046cb5bcb3375c4b1074f3f6db) #2 0x5e98934e5992 in perf_header__process_sections (perf+0x61c992) (Build= Id: 25d667fa7a7274046cb5bcb3375c4b1074f3f6db) #3 0x5e98934e7437 in perf_session__read_header (perf+0x61e437) (BuildId: = 25d667fa7a7274046cb5bcb3375c4b1074f3f6db) #4 0x5e9893521e67 in __perf_session__new (perf+0x658e67) (BuildId: 25d667= fa7a7274046cb5bcb3375c4b1074f3f6db) #5 0x5e989320dedd in cmd_sched (perf+0x344edd) (BuildId: 25d667fa7a727404= 6cb5bcb3375c4b1074f3f6db) #6 0x5e989324c87f in handle_internal_command (perf+0x38387f) (BuildId: 25= d667fa7a7274046cb5bcb3375c4b1074f3f6db) #7 0x5e98930bf836 in main (perf+0x1f6836) (BuildId: 25d667fa7a7274046cb5b= cb3375c4b1074f3f6db) #8 0x7669c0a2a600 in __libc_start_call_main ../sysdeps/nptl/libc_start_ca= ll_main.h:59 #9 0x7669c0a2a717 in __libc_start_main_impl ../csu/libc-start.c:360 #10 0x5e98930c7754 in _start (perf+0x1fe754) (BuildId: 25d667fa7a7274046c= b5bcb3375c4b1074f3f6db) =3D=3D55941=3D=3DRegister values: rax =3D 0x0000000050000000 rbx =3D 0x00007269be7f0a50 rcx =3D 0x00007289bfb= e0970 rdx =3D 0x0000000000000020 =20 rdi =3D 0x0000729c3fbe0790 rsi =3D 0x00007299bfbe07c0 rbp =3D 0x00007ffd2f0= 46790 rsp =3D 0x00007ffd2f046650 =20 r8 =3D 0x00000e5137f7c137 r9 =3D 0x0000000000000000 r10 =3D 0x00000000000= 000dc r11 =3D 0x00007669c24acfec =20 r12 =3D 0x00007269be7f0aa0 r13 =3D 0x0000000000000000 r14 =3D 0x00007299bfb= e07c0 r15 =3D 0x00007269be7f09b0 =20 AddressSanitizer can not provide additional info. 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