diff options
| author | Song Liu <songliubraving@fb.com> | 2020-07-24 13:05:02 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-25 20:16:36 -0700 |
| commit | 2b9b305fcdda1810bdffeb599361174eb2cd0b7c (patch) | |
| tree | 6ac97431bb7987d56ee380f5dc0fb7eb52fb5587 | |
| parent | dfcdf0e9ad2e006196986f363c99b2097aec5ef0 (diff) | |
bpf: Fix build on architectures with special bpf_user_pt_regs_t
Architectures like s390, powerpc, arm64, riscv have speical definition of
bpf_user_pt_regs_t. So we need to cast the pointer before passing it to
bpf_get_stack(). This is similar to bpf_get_stack_tp().
Fixes: 03d42fd2d83f ("bpf: Separate bpf_get_[stack|stackid] for perf events BPF")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200724200503.3629591-1-songliubraving@fb.com
| -rw-r--r-- | kernel/bpf/stackmap.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 5beb2f8c23da..4fd830a62be2 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -678,6 +678,7 @@ const struct bpf_func_proto bpf_get_task_stack_proto = { BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx, void *, buf, u32, size, u64, flags) { + struct pt_regs *regs = (struct pt_regs *)(ctx->regs); struct perf_event *event = ctx->event; struct perf_callchain_entry *trace; bool kernel, user; @@ -685,7 +686,7 @@ BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx, __u64 nr_kernel; if (!(event->attr.sample_type & __PERF_SAMPLE_CALLCHAIN_EARLY)) - return __bpf_get_stack(ctx->regs, NULL, NULL, buf, size, flags); + return __bpf_get_stack(regs, NULL, NULL, buf, size, flags); if (unlikely(flags & ~(BPF_F_SKIP_FIELD_MASK | BPF_F_USER_STACK | BPF_F_USER_BUILD_ID))) @@ -705,8 +706,7 @@ BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx, __u64 nr = trace->nr; trace->nr = nr_kernel; - err = __bpf_get_stack(ctx->regs, NULL, trace, buf, - size, flags); + err = __bpf_get_stack(regs, NULL, trace, buf, size, flags); /* restore nr */ trace->nr = nr; @@ -718,8 +718,7 @@ BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx, goto clear; flags = (flags & ~BPF_F_SKIP_FIELD_MASK) | skip; - err = __bpf_get_stack(ctx->regs, NULL, trace, buf, - size, flags); + err = __bpf_get_stack(regs, NULL, trace, buf, size, flags); } return err; |