diff options
| author | Yauheni Kaliuta <ykaliuta@redhat.com> | 2023-08-01 10:52:22 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-08-01 10:53:28 -0700 |
| commit | d3c4db86c71164ed9ae17b4026e1acde460a18ab (patch) | |
| tree | e87103ebf0ba3975da3e06babd094825313b075f /kernel/trace/trace_syscalls.c | |
| parent | 1110865273c1fe76853c5900b0a28214afc50b4c (diff) | |
tracing: bpf: use struct trace_entry in struct syscall_tp_t
bpf tracepoint program uses struct trace_event_raw_sys_enter as
argument where trace_entry is the first field. Use the same instead
of unsigned long long since if it's amended (for example by RT
patch) it accesses data with wrong offset.
Signed-off-by: Yauheni Kaliuta <ykaliuta@redhat.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230801075222.7717-1-ykaliuta@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/trace/trace_syscalls.c')
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 942ddbdace4a..de753403cdaf 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -555,12 +555,15 @@ static int perf_call_bpf_enter(struct trace_event_call *call, struct pt_regs *re struct syscall_trace_enter *rec) { struct syscall_tp_t { - unsigned long long regs; + struct trace_entry ent; unsigned long syscall_nr; unsigned long args[SYSCALL_DEFINE_MAXARGS]; - } param; + } __aligned(8) param; int i; + BUILD_BUG_ON(sizeof(param.ent) < sizeof(void *)); + + /* bpf prog requires 'regs' to be the first member in the ctx (a.k.a. ¶m) */ *(struct pt_regs **)¶m = regs; param.syscall_nr = rec->nr; for (i = 0; i < sys_data->nb_args; i++) @@ -657,11 +660,12 @@ static int perf_call_bpf_exit(struct trace_event_call *call, struct pt_regs *reg struct syscall_trace_exit *rec) { struct syscall_tp_t { - unsigned long long regs; + struct trace_entry ent; unsigned long syscall_nr; unsigned long ret; - } param; + } __aligned(8) param; + /* bpf prog requires 'regs' to be the first member in the ctx (a.k.a. ¶m) */ *(struct pt_regs **)¶m = regs; param.syscall_nr = rec->nr; param.ret = rec->ret; |