6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jiri Olsa <jolsa@xxxxxxxxxx>
commit 41bc46c12a8053a1b3279a379bd6b5e87b045b85 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: 0dcac2725406 ("bpf: Add multi kprobe link")
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Reviewed-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/bpf/20230907200652.926951-1-jolsa@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/bpf_trace.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2684,6 +2684,17 @@ static void symbols_swap_r(void *a, void
}
}
+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 u
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;
