From a2a2c3c8580a9158bca61221648fd6d5c98c443a Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 27 Sep 2017 08:39:54 +0200 Subject: ima: Use i_version only when filesystem supports it i_version is only supported by a filesystem when the SB_I_VERSION flag is set. This patch tests for the SB_I_VERSION flag before using i_version. If we can't use i_version to detect a file change then we must assume the file has changed in the last_writer path and remeasure it. On filesystems without i_version support IMA used to measure a file only once and didn't detect any changes to a file. With this patch IMA now works properly on these filesystems. Signed-off-by: Sascha Hauer Reviewed-by: Jeff Layton Signed-off-by: Mimi Zohar --- security/integrity/ima/ima_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'security/integrity/ima/ima_main.c') diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 21330d0455b0..6d78cb26784d 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -133,7 +133,8 @@ static void ima_check_last_writer(struct integrity_iint_cache *iint, if (atomic_read(&inode->i_writecount) == 1) { update = test_and_clear_bit(IMA_UPDATE_XATTR, &iint->atomic_flags); - if ((iint->version != inode->i_version) || + if (!IS_I_VERSION(inode) || + (iint->version != inode->i_version) || (iint->flags & IMA_NEW_FILE)) { iint->flags &= ~(IMA_DONE_MASK | IMA_NEW_FILE); iint->measured_pcrs = 0; -- cgit v1.2.3-59-g8ed1b