diff options
| author | Josef Bacik <jbacik@fb.com> | 2017-12-11 11:36:46 -0500 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2017-12-12 08:56:26 -0800 |
| commit | 92ace9991da08827e809c2d120108a96a281e7fc (patch) | |
| tree | f228d246aabb6d72e09d97684ff9a6ac6768c50a /include/linux/bpf.h | |
| parent | a23967c181cae80becb451b38ff2a1e01c05c37b (diff) | |
| download | lwn-92ace9991da08827e809c2d120108a96a281e7fc.tar.gz lwn-92ace9991da08827e809c2d120108a96a281e7fc.zip | |
add infrastructure for tagging functions as error injectable
Using BPF we can override kprob'ed functions and return arbitrary
values. Obviously this can be a bit unsafe, so make this feature opt-in
for functions. Simply tag a function with KPROBE_ERROR_INJECT_SYMBOL in
order to give BPF access to that function for error injection purposes.
Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf.h')
| -rw-r--r-- | include/linux/bpf.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index f812ac508e9f..93e15b9d80c7 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -580,4 +580,15 @@ extern const struct bpf_func_proto bpf_sock_map_update_proto; void bpf_user_rnd_init_once(void); u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); +#if defined(__KERNEL__) && !defined(__ASSEMBLY__) +#ifdef CONFIG_BPF_KPROBE_OVERRIDE +#define BPF_ALLOW_ERROR_INJECTION(fname) \ +static unsigned long __used \ + __attribute__((__section__("_kprobe_error_inject_list"))) \ + _eil_addr_##fname = (unsigned long)fname; +#else +#define BPF_ALLOW_ERROR_INJECTION(fname) +#endif +#endif + #endif /* _LINUX_BPF_H */ |