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bpf: Fix build on architectures with special bpf_user_pt_regs_t

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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
This commit is contained in:
Song Liu 2020-07-24 13:05:02 -07:00 committed by Alexei Starovoitov
parent dfcdf0e9ad
commit 2b9b305fcd
1 changed files with 4 additions and 5 deletions
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9
kernel/bpf/stackmap.c
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@ -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;