diff options
| author | Sascha Hauer <s.hauer@pengutronix.de> | 2017-09-27 08:39:54 +0200 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-12-18 09:43:49 -0500 |
| commit | a2a2c3c8580a9158bca61221648fd6d5c98c443a (patch) | |
| tree | 757954b05ff282edd655f8fdd3929fd7aa80d72c /security | |
| parent | 02c324a55ed9ee4d790eaa9ac8e7cdecbe3e0a22 (diff) | |
| download | linux-a2a2c3c8580a9158bca61221648fd6d5c98c443a.tar.gz linux-a2a2c3c8580a9158bca61221648fd6d5c98c443a.tar.bz2 linux-a2a2c3c8580a9158bca61221648fd6d5c98c443a.zip | |
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 <s.hauer@pengutronix.de>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
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; |