diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index f2360579658e..8f23f5273bab 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1338,8 +1338,6 @@ static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type { if (off < 0 || off >= sizeof(struct pt_regs)) return false; - if (type != BPF_READ) - return false; if (off % size != 0) return false; /* @@ -1349,6 +1347,9 @@ static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type if (off + size > sizeof(struct pt_regs)) return false; + if (type == BPF_WRITE) + prog->aux->kprobe_write_ctx = true; + return true; } @@ -2735,6 +2736,10 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr if (!is_kprobe_multi(prog)) return -EINVAL; + /* Writing to context is not allowed for kprobes. */ + if (prog->aux->kprobe_write_ctx) + return -EINVAL; + flags = attr->link_create.kprobe_multi.flags; if (flags & ~BPF_F_KPROBE_MULTI_RETURN) return -EINVAL; |