diff options
author | Daniel T. Lee <danieltimlee@gmail.com> | 2019-12-05 17:01:14 +0900 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-12 12:17:13 +0100 |
commit | 7d5ad9fe2c9b3ad9c5473e354c12eeb2237520c2 (patch) | |
tree | d4d488aec5491913c5c73da02069b031ef77aa9f /samples/bpf | |
parent | 5663eb75ee9ad591b089e92f03029ed970e05baf (diff) | |
download | linux-stable-7d5ad9fe2c9b3ad9c5473e354c12eeb2237520c2.tar.gz linux-stable-7d5ad9fe2c9b3ad9c5473e354c12eeb2237520c2.tar.bz2 linux-stable-7d5ad9fe2c9b3ad9c5473e354c12eeb2237520c2.zip |
samples: bpf: fix syscall_tp due to unused syscall
[ Upstream commit fe3300897cbfd76c6cb825776e5ac0ca50a91ca4 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'samples/bpf')
-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 9149c524d279..8833aacb9c8c 100644 --- a/samples/bpf/syscall_tp_kern.c +++ b/samples/bpf/syscall_tp_kern.c @@ -50,13 +50,27 @@ 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; } |