6.6-stable review patch. If anyone has any objections, please let me know.
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From: Samasth Norway Ananda samasth.norway.ananda@oracle.com
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 --- security/integrity/ima/ima_template_lib.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
--- 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(c 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);