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/asm-generic | |
| parent | a23967c181cae80becb451b38ff2a1e01c05c37b (diff) | |
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/asm-generic')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index ee8b707d9fa9..a2e8582d094a 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -136,6 +136,15 @@ #define KPROBE_BLACKLIST() #endif +#ifdef CONFIG_BPF_KPROBE_OVERRIDE +#define ERROR_INJECT_LIST() . = ALIGN(8); \ + VMLINUX_SYMBOL(__start_kprobe_error_inject_list) = .; \ + KEEP(*(_kprobe_error_inject_list)) \ + VMLINUX_SYMBOL(__stop_kprobe_error_inject_list) = .; +#else +#define ERROR_INJECT_LIST() +#endif + #ifdef CONFIG_EVENT_TRACING #define FTRACE_EVENTS() . = ALIGN(8); \ VMLINUX_SYMBOL(__start_ftrace_events) = .; \ @@ -564,6 +573,7 @@ FTRACE_EVENTS() \ TRACE_SYSCALLS() \ KPROBE_BLACKLIST() \ + ERROR_INJECT_LIST() \ MEM_DISCARD(init.rodata) \ CLK_OF_TABLES() \ RESERVEDMEM_OF_TABLES() \ |