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bpf: Add override check to kprobe multi link attach

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commit 41bc46c12a upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Olsa
2023-09-07 22:06:51 +02:00
committed by Greg Kroah-Hartman
parent 09635bf4cd
commit b1041cab47
1 changed files with 16 additions and 0 deletions
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16
kernel/trace/bpf_trace.c
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@@ -2684,6 +2684,17 @@ static void symbols_swap_r(void *a, void *b, int size, const void *priv)
}
}
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;
@@ -2761,6 +2772,11 @@ 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;