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Thu, 28 May 2026 23:50:21 -0700 (PDT) Received: from [127.0.1.1] ([104.28.157.202]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc0c1ab21sm952626a91.14.2026.05.28.23.50.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 23:50:20 -0700 (PDT) Subject: [PATCH 3/6] perf/header: reject data offset beyond file size 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 14:50:13 +0800 Message-ID: <178003741374.62097.136470109571301341@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="===============5064275133724409396==" --===============5064275133724409396== Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable >>From cc2ff328f62f766f74de038347d88ee2dc75f78d Mon Sep 17 00:00:00 2001 From: Wang Haoran Date: Thu, 28 May 2026 15:17:07 +0800 Subject: [PATCH 3/6] perf/header: reject data offset beyond file size A crafted perf.data file can set data.offset to a value larger than the actual file size. perf then calls mmap() with that file offset, which succeeds but maps a region entirely past the end of the file. Any subsequent access to the mapped memory triggers SIGBUS. Add a fstat() check in perf_file_header__read() that rejects files whose claimed data.offset exceeds the real file size. Fixes: Signed-off-by: Wang Haoran --- tools/perf/util/header.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index e000eb9c1..f1a1831cf 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -4335,6 +4335,15 @@ int perf_file_header__read(struct perf_file_header *he= ader, return -1; } =20 + { + struct stat st; + + if (fstat(fd, &st) =3D=3D 0 && header->data.offset > (u64)st.st_size) { + pr_err("Perf file header corrupt: data offset beyond file size\n"); + return -1; + } + } + if (header->size !=3D sizeof(*header)) { /* Support the previous format */ if (header->size =3D=3D offsetof(typeof(*header), adds_features)) --=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=3D55933=3D=3DERROR: AddressSanitizer: BUS on unknown address (pc 0x5d3506= 9296b4 bp 0x7fffd2df9100 sp 0x7fffd2df90a0 T0) =3D=3D55933=3D=3DThe signal is caused by a READ memory access. =3D=3D55933=3D=3DHint: this fault was caused by a dereference of a high value= address (see register values below). Disassemble the provided pc to learn w= hich register was used. #0 0x5d35069296b4 in reader__read_event (perf+0x65e6b4) (BuildId: 25d667f= a7a7274046cb5bcb3375c4b1074f3f6db) #1 0x5d350692a21d in perf_session__process_events (perf+0x65f21d) (BuildI= d: 25d667fa7a7274046cb5bcb3375c4b1074f3f6db) #2 0x5d350660ff97 in cmd_sched (perf+0x344f97) (BuildId: 25d667fa7a727404= 6cb5bcb3375c4b1074f3f6db) #3 0x5d350664e87f in handle_internal_command (perf+0x38387f) (BuildId: 25= d667fa7a7274046cb5bcb3375c4b1074f3f6db) #4 0x5d35064c1836 in main (perf+0x1f6836) (BuildId: 25d667fa7a7274046cb5b= cb3375c4b1074f3f6db) #5 0x7f111f42a600 in __libc_start_call_main ../sysdeps/nptl/libc_start_ca= ll_main.h:59 #6 0x7f111f42a717 in __libc_start_main_impl ../csu/libc-start.c:360 #7 0x5d35064c9754 in _start (perf+0x1fe754) (BuildId: 25d667fa7a7274046cb= 5bcb3375c4b1074f3f6db) =3D=3D55933=3D=3DRegister values: rax =3D 0x0000000000000007 rbx =3D 0x00007b111d54bd90 rcx =3D 0x00000000000= 00001 rdx =3D 0x0000000000000000 =20 rdi =3D 0x00007b111d54bdd8 rsi =3D 0x00007ce11e5e0080 rbp =3D 0x00007fffd2d= f9100 rsp =3D 0x00007fffd2df90a0 =20 r8 =3D 0x0000000000000f68 r9 =3D 0x0000000000000000 r10 =3D 0x00007ce11e5= e0080 r11 =3D 0x0000000000000246 =20 r12 =3D 0x00007f111ebb7f68 r13 =3D 0x00000000000103c8 r14 =3D 0x00007f111eb= b7f6e r15 =3D 0x00007ce11e5e0080 =20 AddressSanitizer can not provide additional info. 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