lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 28 Sep 2022 06:57:19 -0000 From: "tip-bot2 for Jiri Olsa" <tip-bot2@...utronix.de> To: linux-tip-commits@...r.kernel.org Cc: Jiri Olsa <jolsa@...nel.org>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: [tip: perf/core] bpf: Check flags for branch stack in bpf_read_branch_records helper The following commit has been merged into the perf/core branch of tip: Commit-ID: cce6a2d7e0e494c453ad73e1e78bd50684f20cca Gitweb: https://git.kernel.org/tip/cce6a2d7e0e494c453ad73e1e78bd50684f20cca Author: Jiri Olsa <jolsa@...nel.org> AuthorDate: Tue, 27 Sep 2022 22:32:59 +02:00 Committer: Peter Zijlstra <peterz@...radead.org> CommitterDate: Tue, 27 Sep 2022 22:50:25 +02:00 bpf: Check flags for branch stack in bpf_read_branch_records helper Recent commit [1] changed branch stack data indication from br_stack pointer to sample_flags in perf_sample_data struct. We need to check sample_flags for PERF_SAMPLE_BRANCH_STACK bit for valid branch stack data. [1] a9a931e26668 ("perf: Use sample_flags for branch stack") Fixes: a9a931e26668 ("perf: Use sample_flags for branch stack") Signed-off-by: Jiri Olsa <jolsa@...nel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> Reviewed-by: Kan Liang <kan.liang@...ux.intel.com> Link: https://lore.kernel.org/r/20220927203259.590950-1-jolsa@kernel.org --- kernel/trace/bpf_trace.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 68e5cdd..1fcd123 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1507,6 +1507,9 @@ BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx, if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE)) return -EINVAL; + if (unlikely(!(ctx->data->sample_flags & PERF_SAMPLE_BRANCH_STACK))) + return -ENOENT; + if (unlikely(!br_stack)) return -ENOENT;
Powered by blists - more mailing lists