diff options
| author | Kees Cook <keescook@chromium.org> | 2023-08-17 14:03:28 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2023-08-18 10:17:07 -0700 |
| commit | a4b35d4d05b9f2e84c1dd6301d3dca65719334ef (patch) | |
| tree | 8d1a6e7d740e86686fa0c166f6e32f7fbd9b086d /security | |
| parent | 5d207e83ca41206e75c2cd414d40b451ef04c259 (diff) | |
integrity: Annotate struct ima_rule_opt_list with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct ima_rule_opt_list.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Mimi Zohar <zohar@linux.ibm.com>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20230817210327.never.598-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index c9b3bd8f1bb9..7a0420cf1a6a 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -68,7 +68,7 @@ enum policy_rule_list { IMA_DEFAULT_POLICY = 1, IMA_CUSTOM_POLICY }; struct ima_rule_opt_list { size_t count; - char *items[]; + char *items[] __counted_by(count); }; /* @@ -342,6 +342,7 @@ static struct ima_rule_opt_list *ima_alloc_rule_opt_list(const substring_t *src) kfree(src_copy); return ERR_PTR(-ENOMEM); } + opt_list->count = count; /* * strsep() has already replaced all instances of '|' with '\0', @@ -357,7 +358,6 @@ static struct ima_rule_opt_list *ima_alloc_rule_opt_list(const substring_t *src) opt_list->items[i] = cur; cur = strchr(cur, '\0') + 1; } - opt_list->count = count; return opt_list; } |