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bpf: Add override check to kprobe multi link attach 

Currently the multi_kprobe link attach does not check error
injection list for programs with bpf_override_return helper
and allows them to attach anywhere. Adding the missing check.

Fixes: 0dcac27254 ("bpf: Add multi kprobe link")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/bpf/20230907200652.926951-1-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-07 22:06:51 +02:00 committed by Andrii Nakryiko
parent ac28b1ec61
commit 41bc46c12a
1 changed files with 16 additions and 0 deletions
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16
kernel/trace/bpf_trace.c
View File

@ -2853,6 +2853,17 @@ static int get_modules_for_addrs(struct module ***mods, unsigned long *addrs, u3
return arr.mods_cnt;
}
static int addrs_check_error_injection_list(unsigned long *addrs, u32 cnt)
{
u32 i;
for (i = 0; i < cnt; i++) {
if (!within_error_injection_list(addrs[i]))
return -EINVAL;
}
return 0;
}
int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
{
struct bpf_kprobe_multi_link *link = NULL;
@ -2930,6 +2941,11 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
goto error;
}
if (prog->kprobe_override && addrs_check_error_injection_list(addrs, cnt)) {
err = -EINVAL;
goto error;
}
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link) {
err = -ENOMEM;