From: Samasth Norway Ananda samasth.norway.ananda@oracle.com

stable inclusion from stable-v6.6.63 commit 8a84765c62cc0469864e2faee43aae253ad16082 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB75G4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit 923168a0631bc42fffd55087b337b1b6c54dcff5 upstream.

Function ima_eventdigest_init() calls ima_eventdigest_init_common() with HASH_ALGO__LAST which is then used to access the array hash_digest_size[] leading to buffer overrun. Have a conditional statement to handle this.

Fixes: 9fab303a2cb3 ("ima: fix violation measurement list record") Signed-off-by: Samasth Norway Ananda samasth.norway.ananda@oracle.com Tested-by: Enrico Bravi (PhD at polito.it) enrico.bravi@huawei.com Cc: stable@vger.kernel.org # 5.19+ Signed-off-by: Mimi Zohar zohar@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Gu Bowen gubowen5@huawei.com --- security/integrity/ima/ima_template_lib.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c index 4bcc77c092b6..bd74b87ad438 100644 --- a/security/integrity/ima/ima_template_lib.c +++ b/security/integrity/ima/ima_template_lib.c @@ -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);