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authorDaniel T. Lee <danieltimlee@gmail.com>2019-12-05 11:01:14 +0300
committerAlexei Starovoitov <ast@kernel.org>2019-12-12 02:28:06 +0300
commitfe3300897cbfd76c6cb825776e5ac0ca50a91ca4 (patch)
treec27a039d9886cae1572f81d80e35af60bf9cd740 /samples
parentbba1b2a890253528c45aa66cf856f289a215bfbc (diff)
downloadlinux-fe3300897cbfd76c6cb825776e5ac0ca50a91ca4.tar.xz
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')
-rw-r--r--samples/bpf/syscall_tp_kern.c18
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;
}