diff mbox series

[bpf-next,v5,2/9] bpf: Remove truncation test in bpf_strtol and bpf_strtoul helpers

Message ID 20240913191754.13290-2-daniel@iogearbox.net (mailing list archive)
State Accepted
Commit 7d71f59e028028f1160602121f40f45e89b3664e
Delegated to: BPF
Headers show
Series [bpf-next,v5,1/9] bpf: Fix bpf_strtol and bpf_strtoul helpers for 32bit | expand

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netdev/cc_maintainers warning 9 maintainers not CCed: sdf@fomichev.me eddyz87@gmail.com haoluo@google.com jolsa@kernel.org song@kernel.org yonghong.song@linux.dev kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com
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Commit Message

Daniel Borkmann Sept. 13, 2024, 7:17 p.m. UTC 
Both bpf_strtol() and bpf_strtoul() helpers passed a temporary "long long"
respectively "unsigned long long" to __bpf_strtoll() / __bpf_strtoull().

Later, the result was checked for truncation via _res != ({unsigned,} long)_res
as the destination buffer for the BPF helpers was of type {unsigned,} long
which is 32bit on 32bit architectures.

Given the latter was a bug in the helper signatures where the destination buffer
got adjusted to {s,u}64, the truncation check can now be removed.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
---
 v3 -> v4:
 - added patch 

 kernel/bpf/helpers.c | 4 ----
 1 file changed, 4 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 0cf42be52890..5404bb964d83 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -526,8 +526,6 @@  BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags,
 	err = __bpf_strtoll(buf, buf_len, flags, &_res);
 	if (err < 0)
 		return err;
-	if (_res != (long)_res)
-		return -ERANGE;
 	*res = _res;
 	return err;
 }
@@ -554,8 +552,6 @@  BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags,
 		return err;
 	if (is_negative)
 		return -EINVAL;
-	if (_res != (unsigned long)_res)
-		return -ERANGE;
 	*res = _res;
 	return err;
 }