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integrity-v6.12

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Merge tag 'integrity-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity

Pull integrity fixes from Mimi Zohar:
 "One bug fix, one performance improvement, and the use of
  static_assert:

   - The bug fix addresses "only a cosmetic change" commit, which didn't
     take into account the original 'ima' template definition.

  - The performance improvement limits the atomic_read()"

* tag 'integrity-v6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
  integrity: Use static_assert() to check struct sizes
  evm: stop avoidably reading i_writecount in evm_file_release
  ima: fix buffer overrun in ima_eventdigest_init_common
This commit is contained in:
Linus Torvalds 2024-11-12 13:06:31 -08:00
commit 93db202ce0
3 changed files with 16 additions and 5 deletions
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3
security/integrity/evm/evm_main.c
View File

@ -1084,7 +1084,8 @@ static void evm_file_release(struct file *file)
if (!S_ISREG(inode->i_mode) || !(mode & FMODE_WRITE))
return;
if (iint && atomic_read(&inode->i_writecount) == 1)
if (iint && iint->flags & EVM_NEW_FILE &&
atomic_read(&inode->i_writecount) == 1)
iint->flags &= ~EVM_NEW_FILE;
}

14
security/integrity/ima/ima_template_lib.c
View File

@ -318,15 +318,21 @@ static int ima_eventdigest_init_common(const u8 *digest, u32 digestsize,
hash_algo_name[hash_algo]);
}
if (digest)
if (digest) {
memcpy(buffer + offset, digest, digestsize);
else
} else {
/*
* If digest is NULL, the event being recorded is a violation.
* Make room for the digest by increasing the offset by the
* hash algorithm digest size.
* hash algorithm digest size. If the hash algorithm is not
* specified increase the offset by IMA_DIGEST_SIZE which
* fits SHA1 or MD5
*/
offset += hash_digest_size[hash_algo];
if (hash_algo < HASH_ALGO__LAST)
offset += hash_digest_size[hash_algo];
else
offset += IMA_DIGEST_SIZE;
}
return ima_write_template_field_data(buffer, offset + digestsize,
fmt, field_data);

4
security/integrity/integrity.h
View File

@ -37,6 +37,8 @@ struct evm_ima_xattr_data {
);
u8 data[];
} __packed;
static_assert(offsetof(struct evm_ima_xattr_data, data) == sizeof(struct evm_ima_xattr_data_hdr),
"struct member likely outside of __struct_group()");
/* Only used in the EVM HMAC code. */
struct evm_xattr {
@ -65,6 +67,8 @@ struct ima_digest_data {
);
u8 digest[];
} __packed;
static_assert(offsetof(struct ima_digest_data, digest) == sizeof(struct ima_digest_data_hdr),
"struct member likely outside of __struct_group()");
/*
* Instead of wrapping the ima_digest_data struct inside a local structure