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AFNElJ8tWK+sWg1YfhI40zUlqloKpsDCvJSm68QFGR5RQCc/8xFy5Au5xVUWk50BB3TqvmhyT8G74bl5fM06QTznVrzW@vger.kernel.org X-Gm-Message-State: AOJu0YwFkgpCTc5zzTQPClRrqdA218pCXWO/xckiG/2ggm9JNX+QoJHD AwQQhNZaL28X2Ppw5NkB2W1QXjw9sSlJVTedF4P4MDeukwkpqIzHhgSeAR7aI6fSzUpbxWkT4Lb UGbEtWaLC5w== X-Received: from dycaj11.prod.google.com ([2002:a05:7300:fb8b:b0:2e6:f22b:f849]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:6ca6:b0:2df:7882:1cf3 with SMTP id 5a478bee46e88-3042b30768dmr470549eec.2.1779304005319; Wed, 20 May 2026 12:06:45 -0700 (PDT) Date: Wed, 20 May 2026 12:05:36 -0700 In-Reply-To: <20260520190538.142018-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260512223001.2952848-1-irogers@google.com> <20260520190538.142018-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.746.g67dd491aae-goog Message-ID: <20260520190538.142018-31-irogers@google.com> Subject: [PATCH v14 30/32] perf evsel: Add bounds checking to trace point raw data accessors From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: adrian.hunter@intel.com, ajones@ventanamicro.com, ak@linux.intel.com, alex@ghiti.fr, alexander.shishkin@linux.intel.com, anup@brainfault.org, aou@eecs.berkeley.edu, atrajeev@linux.ibm.com, blakejones@google.com, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dvyukov@google.com, howardchu95@gmail.com, hrishikesh123s@gmail.com, james.clark@linaro.org, jolsa@kernel.org, krzysztof.m.lopatowski@gmail.com, leo.yan@arm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux@treblig.org, mingo@redhat.com, nichen@iscas.ac.cn, palmer@dabbelt.com, peterz@infradead.org, pjw@kernel.org, ravi.bangoria@amd.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, thomas.falcon@intel.com, tianyou.li@intel.com, yujie.liu@intel.com, zhouquan@iscas.ac.cn Content-Type: text/plain; charset="UTF-8" Prevent out-of-bounds memory reads when parsing corrupted or maliciously crafted perf.data files by introducing robust bounds validation to raw data accessors. - Add a helper out_of_bounds() to check if field offsets and sizes exceed the sample's raw_size boundary, preventing heap read overflows. - In perf_sample__rawptr(), properly resolve newer relative dynamic tracepoint fields (__rel_loc) by checking the boundaries before and after reading the dynamic field descriptor. - Byte-swap dynamic field offsets and sizes dynamically when endianness varies, ensuring cross-endian parsing is robust. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim --- tools/perf/util/evsel.c | 54 +++++++++++++++++++++++++++++++++++++---- 1 file changed, 49 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index bb48568b8101..713a250c7374 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -3700,22 +3700,63 @@ struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *na return tp_format ? tep_find_common_field(tp_format, name) : NULL; } +static bool out_of_bounds(const struct tep_format_field *field, int offset, int size, u32 raw_size) +{ + if (offset < 0) { + pr_warning("Negative trace point field offset %d in %s\n", + offset, field->name); + return true; + } + if (size < 0) { + pr_warning("Negative trace point field size %d in %s\n", + size, field->name); + return true; + } + if ((u32)offset + (u32)size > raw_size) { + pr_warning("Out of bound tracepoint field (%s) offset %d size %d in %u\n", + field->name, offset, size, raw_size); + return true; + } + return false; +} + void *perf_sample__rawptr(struct perf_sample *sample, const char *name) { struct tep_format_field *field = evsel__field(sample->evsel, name); - int offset; + int offset, size; if (!field) return NULL; offset = field->offset; - + size = field->size; if (field->flags & TEP_FIELD_IS_DYNAMIC) { - offset = *(int *)(sample->raw_data + field->offset); - offset &= 0xffff; - if (tep_field_is_relative(field->flags)) + int dynamic_data; + + if (out_of_bounds(field, offset, 4, sample->raw_size)) + return NULL; + + dynamic_data = *(int *)(sample->raw_data + field->offset); + + if (sample->evsel->needs_swap) + dynamic_data = bswap_32(dynamic_data); + + offset = dynamic_data & 0xffff; + size = (dynamic_data >> 16) & 0xffff; + + if (tep_field_is_relative(field->flags)) { + /* + * Newer kernel feature: Relative offsets (__rel_loc). + * If the relative flag is set, the parsed offset is not + * absolute from the start of the record. Instead, it is + * relative to the *end* of the dynamic field descriptor + * itself. + */ offset += field->offset + field->size; + } } + if (out_of_bounds(field, offset, size, sample->raw_size)) + return NULL; return sample->raw_data + offset; } @@ -3726,6 +3767,9 @@ u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sam u64 value; void *ptr = sample->raw_data + field->offset; + if (out_of_bounds(field, field->offset, field->size, sample->raw_size)) + return 0; + switch (field->size) { case 1: return *(u8 *)ptr; -- 2.54.0.746.g67dd491aae-goog