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bpf: Fix missing -EFAULT return on user log buf error in btf_parse()

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btf_parse() is missing -EFAULT error return if log->ubuf was NULL-ed out
due to error while copying data into user-provided buffer. Add it, but
handle a special case of BPF_LOG_KERNEL in which log->ubuf is always NULL.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Lorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/bpf/20230406234205.323208-9-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2023-04-06 16:41:54 -07:00 • committed by Daniel Borkmann
parent 24bc80887a
commit 971fb5057d
1 changed files with 4 additions and 0 deletions
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4
kernel/bpf/btf.c
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@ -5598,6 +5598,10 @@ static struct btf *btf_parse(bpfptr_t btf_data, u32 btf_data_size,
err = -ENOSPC;
goto errout_meta;
}
if (log->level && log->level != BPF_LOG_KERNEL && !log->ubuf) {
err = -EFAULT;
goto errout_meta;
}
btf_verifier_env_free(env);
refcount_set(&btf->refcnt, 1);