diff options
Diffstat (limited to 'tools/perf/examples')
| -rw-r--r-- | tools/perf/examples/bpf/augmented_syscalls.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/tools/perf/examples/bpf/augmented_syscalls.c b/tools/perf/examples/bpf/augmented_syscalls.c index 1419a9186937..0decbcfa8b90 100644 --- a/tools/perf/examples/bpf/augmented_syscalls.c +++ b/tools/perf/examples/bpf/augmented_syscalls.c @@ -33,9 +33,9 @@ struct syscall_exit_args { }; struct augmented_filename { - int size; - int reserved; - char value[256]; + unsigned int size; + int reserved; + char value[256]; }; #define augmented_filename_syscall(syscall) \ @@ -46,14 +46,15 @@ struct augmented_enter_##syscall##_args { \ int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \ { \ struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \ + unsigned int len = sizeof(augmented_args); \ probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \ augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, \ sizeof(augmented_args.filename.value), \ args->filename_ptr); \ + if (augmented_args.filename.size < sizeof(augmented_args.filename.value)) \ + len -= sizeof(augmented_args.filename.value) - augmented_args.filename.size; \ perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \ - &augmented_args, \ - (sizeof(augmented_args) - sizeof(augmented_args.filename.value) + \ - augmented_args.filename.size)); \ + &augmented_args, len); \ return 0; \ } \ int syscall_exit(syscall)(struct syscall_exit_args *args) \ |