diff options
| author | Stephen Smalley <stephen.smalley.work@gmail.com> | 2025-06-13 15:37:05 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-06-27 11:04:20 +0100 |
| commit | e825daf0b2b1da827ed28cd795c9e80dc34f6ede (patch) | |
| tree | 0f8d5a8c3ab698757cf790cc58d4690490f14e33 /security | |
| parent | 996c27b974c274731c89f9f095fd41fb14174099 (diff) | |
selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len
commit 86c8db86af43f52f682e53a0f2f0828683be1e52 upstream.
We should count the terminating NUL byte as part of the ctx_len.
Otherwise, UBSAN logs a warning:
UBSAN: array-index-out-of-bounds in security/selinux/xfrm.c:99:14
index 60 is out of range for type 'char [*]'
The allocation itself is correct so there is no actual out of bounds
indexing, just a warning.
Cc: stable@vger.kernel.org
Suggested-by: Christian Göttsche <cgzones@googlemail.com>
Link: https://lore.kernel.org/selinux/CAEjxPJ6tA5+LxsGfOJokzdPeRomBHjKLBVR6zbrg+_w3ZZbM3A@mail.gmail.com/
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/xfrm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c index 114245b6f7c7..5b315e3e8dc3 100644 --- a/security/selinux/xfrm.c +++ b/security/selinux/xfrm.c @@ -95,7 +95,7 @@ static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp, ctx->ctx_doi = XFRM_SC_DOI_LSM; ctx->ctx_alg = XFRM_SC_ALG_SELINUX; - ctx->ctx_len = str_len; + ctx->ctx_len = str_len + 1; memcpy(ctx->ctx_str, &uctx[1], str_len); ctx->ctx_str[str_len] = '\0'; rc = security_context_to_sid(&selinux_state, ctx->ctx_str, str_len, |