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author | Daniel T. Lee <danieltimlee@gmail.com> | 2019-12-05 17:01:14 +0900 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2019-12-11 15:28:06 -0800 |
commit | fe3300897cbfd76c6cb825776e5ac0ca50a91ca4 (patch) | |
tree | c27a039d9886cae1572f81d80e35af60bf9cd740 /samples/bpf/syscall_tp_kern.c | |
parent | bba1b2a890253528c45aa66cf856f289a215bfbc (diff) | |
download | linux-fe3300897cbfd76c6cb825776e5ac0ca50a91ca4.tar.gz linux-fe3300897cbfd76c6cb825776e5ac0ca50a91ca4.tar.bz2 linux-fe3300897cbfd76c6cb825776e5ac0ca50a91ca4.zip |
samples: bpf: fix syscall_tp due to unused syscall
Currently, open() is called from the user program and it calls the syscall
'sys_openat', not the 'sys_open'. This leads to an error of the program
of user side, due to the fact that the counter maps are zero since no
function such 'sys_open' is called.
This commit adds the kernel bpf program which are attached to the
tracepoint 'sys_enter_openat' and 'sys_enter_openat'.
Fixes: 1da236b6be963 ("bpf: add a test case for syscalls/sys_{enter|exit}_* tracepoints")
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'samples/bpf/syscall_tp_kern.c')
-rw-r--r-- | samples/bpf/syscall_tp_kern.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/samples/bpf/syscall_tp_kern.c b/samples/bpf/syscall_tp_kern.c index 1d78819ffef1..630ce8c4d5a2 100644 --- a/samples/bpf/syscall_tp_kern.c +++ b/samples/bpf/syscall_tp_kern.c @@ -47,13 +47,27 @@ static __always_inline void count(void *map) SEC("tracepoint/syscalls/sys_enter_open") int trace_enter_open(struct syscalls_enter_open_args *ctx) { - count((void *)&enter_open_map); + count(&enter_open_map); + return 0; +} + +SEC("tracepoint/syscalls/sys_enter_openat") +int trace_enter_open_at(struct syscalls_enter_open_args *ctx) +{ + count(&enter_open_map); return 0; } SEC("tracepoint/syscalls/sys_exit_open") int trace_enter_exit(struct syscalls_exit_open_args *ctx) { - count((void *)&exit_open_map); + count(&exit_open_map); + return 0; +} + +SEC("tracepoint/syscalls/sys_exit_openat") +int trace_enter_exit_at(struct syscalls_exit_open_args *ctx) +{ + count(&exit_open_map); return 0; } |