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add infrastructure for tagging functions as error injectable

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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>
This commit is contained in:
Josef Bacik 2017-12-11 11:36:46 -05:00 • committed by Alexei Starovoitov
parent a23967c181
commit 92ace9991d
6 changed files with 195 additions and 1 deletions
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11
include/linux/bpf.h
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@ -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 */