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[bpf,v4,2/3] bpf_trace: bail out from bpf_kprobe_multi_link_attach when in compat

Message ID f617d4d10690af09968af6f829e923a1a61c8545.1652982525.git.esyr@redhat.com (mailing list archive)
State New
Headers show
Series Fix kprobe_multi interface issues for 5.18 | expand

Commit Message

Eugene Syromiatnikov May 19, 2022, 6:14 p.m. UTC
Since bpf_kprobe_multi_link_attach doesn't support 32-bit kernels
for whatever reason, having it enabled for compat processes on 64-bit
kernels makes even less sense due to discrepances in the type sizes
that it does not handle.

Fixes: 0dcac272540613d4 ("bpf: Add multi kprobe link")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
 kernel/trace/bpf_trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 26cf99c..d6db124 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2412,7 +2412,7 @@  int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 	int err;
 	/* no support for 32bit archs yet */
-	if (sizeof(u64) != sizeof(void *))
+	if (sizeof(u64) != sizeof(void *) || in_compat_syscall())
 		return -EOPNOTSUPP;
 	if (prog->expected_attach_type != BPF_TRACE_KPROBE_MULTI)