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bpf: propagate kvmemdup_bpfptr errors from bpf_prog_verify_signature

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kvmemdup_bpfptr() returns -EFAULT when the user pointer cannot be
copied, and -ENOMEM on allocation failure. The error path always
returned -ENOMEM, misreporting bad addresses as out-of-memory.

Return PTR_ERR(sig) so user space gets the correct errno.

Signed-off-by: Weixie Cui <cuiweixie@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/tencent_C9C5B2B28413D6303D505CD02BFEA4708C07@qq.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Weixie Cui
2026-03-21 14:08:00 +08:00
committed by Alexei Starovoitov
parent 280de43e88
commit ad2f7ed0ee
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/syscall.c
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@@ -2832,7 +2832,7 @@ static int bpf_prog_verify_signature(struct bpf_prog *prog, union bpf_attr *attr
sig = kvmemdup_bpfptr(usig, attr->signature_size);
if (IS_ERR(sig)) {
bpf_key_put(key);
return -ENOMEM;
return PTR_ERR(sig);
}
bpf_dynptr_init(&sig_ptr, sig, BPF_DYNPTR_TYPE_LOCAL, 0,