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authorKees Cook <keescook@chromium.org>2023-08-18 02:59:56 +0300
committerKees Cook <keescook@chromium.org>2023-08-26 02:07:30 +0300
commit5f536ac6a5a7b67351e4e5ae4f9e1e57d31268e6 (patch)
treeed211e9dde27ef90f078f58cbd6d717dc2a5d0b9 /security
parent76903a9648744c081547c91f31ec3917204b74e5 (diff)
downloadlinux-5f536ac6a5a7b67351e4e5ae4f9e1e57d31268e6.tar.xz
LoadPin: Annotate struct dm_verity_loadpin_trusted_root_digest 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 dm_verity_loadpin_trusted_root_digest. 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: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@kernel.org> Cc: dm-devel@redhat.com Cc: Paul Moore <paul@paul-moore.com> Cc: James Morris <jmorris@namei.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: linux-security-module@vger.kernel.org Link: https://lore.kernel.org/r/20230817235955.never.762-kees@kernel.org Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'security')
-rw-r--r--security/loadpin/loadpin.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index ebae964f7cc9..a9d40456a064 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -336,6 +336,7 @@ static int read_trusted_verity_root_digests(unsigned int fd)
rc = -ENOMEM;
goto err;
}
+ trd->len = len;
if (hex2bin(trd->data, d, len)) {
kfree(trd);
@@ -343,8 +344,6 @@ static int read_trusted_verity_root_digests(unsigned int fd)
goto err;
}
- trd->len = len;
-
list_add_tail(&trd->node, &dm_verity_loadpin_trusted_root_digests);
}