aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/module.c
diff options
context:
space:
mode:
authorJosef Bacik <jbacik@fb.com>2017-12-11 11:36:46 -0500
committerAlexei Starovoitov <ast@kernel.org>2017-12-12 08:56:26 -0800
commit92ace9991da08827e809c2d120108a96a281e7fc (patch)
treef228d246aabb6d72e09d97684ff9a6ac6768c50a /kernel/module.c
parenta23967c181cae80becb451b38ff2a1e01c05c37b (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 'kernel/module.c')
-rw-r--r--kernel/module.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c
index dea01ac9cb74..bd695bfdc5c4 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -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);

Privacy Policy