diff options
| author | Stephen Smalley <stephen.smalley.work@gmail.com> | 2025-06-13 15:37:05 -0400 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2025-06-16 19:02:22 -0400 |
| commit | 86c8db86af43f52f682e53a0f2f0828683be1e52 (patch) | |
| tree | 4e0c6ab77af89f180f2af818cd211b431ad93652 | |
| parent | e04c78d86a9699d136910cfc0bdcf01087e3267e (diff) | |
selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len
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>
| -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 90ec4ef1b082..61d56b0c2be1 100644 --- a/security/selinux/xfrm.c +++ b/security/selinux/xfrm.c @@ -94,7 +94,7 @@ 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(ctx->ctx_str, str_len, |