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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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6
kernel/module.c
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@ -3118,7 +3118,11 @@ static int find_module_sections(struct module *mod, struct load_info *info)
sizeof(*mod->ftrace_callsites),
&mod->num_ftrace_callsites);
#endif
#ifdef CONFIG_BPF_KPROBE_OVERRIDE
mod->kprobe_ei_funcs = section_objs(info, "_kprobe_error_inject_list",
sizeof(*mod->kprobe_ei_funcs),
&mod->num_kprobe_ei_funcs);
#endif
mod->extable = section_objs(info, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);