diff mbox series

[v3,bpf-next,08/19] bpf: fix missing -EFAULT return on user log buf error in btf_parse()

Message ID 20230404043659.2282536-9-andrii@kernel.org (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series BPF verifier rotating log | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 22 this patch: 22
netdev/cc_maintainers warning 8 maintainers not CCed: song@kernel.org sdf@google.com haoluo@google.com yhs@fb.com john.fastabend@gmail.com kpsingh@kernel.org jolsa@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked
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Commit Message

Andrii Nakryiko April 4, 2023, 4:36 a.m. UTC 
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>
---
 kernel/bpf/btf.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Lorenz Bauer April 5, 2023, 5:28 p.m. UTC | #1 
On Tue, Apr 4, 2023 at 5:37 AM Andrii Nakryiko <andrii@kernel.org> wrote:
>
> 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>

Acked-by: Lorenz Bauer <lmb@isovalent.com>
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 2574cc9b3e28..a67b1b669b0c 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -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);