diff options
Diffstat (limited to 'kernel/trace/bpf_trace.c')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 1860e7f1e5a8..c22a961d1a42 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -459,6 +459,13 @@ static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type return false; if (off % size != 0) return false; + /* + * Assertion for 32 bit to make sure last 8 byte access + * (BPF_DW) to the last 4 byte member is disallowed. + */ + if (off + size > sizeof(struct pt_regs)) + return false; + return true; } @@ -540,6 +547,8 @@ static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type return false; if (off % size != 0) return false; + + BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64)); return true; } |