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| author | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2014-03-18 04:24:18 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2014-06-12 23:58:05 +0200 |
| commit | 060bdebfb0b82751be89c0ce4b6e2c88606a354b (patch) | |
| tree | b3b8253420850eb54927da9f68e41d9ad074ac6f /security/integrity | |
| parent | Merge tag 'dm-3.16-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/... (diff) | |
| download | linux-060bdebfb0b82751be89c0ce4b6e2c88606a354b.tar.xz linux-060bdebfb0b82751be89c0ce4b6e2c88606a354b.zip | |
ima: prevent new digsig xattr from being replaced
Even though a new xattr will only be appraised on the next access,
set the DIGSIG flag to prevent a signature from being replaced with
a hash on file close.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
| -rw-r--r-- | security/integrity/ima/ima_appraise.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 291bf0f3a46d..d3113d4aaa3c 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -341,7 +341,7 @@ static int ima_protect_xattr(struct dentry *dentry, const char *xattr_name, return 0; } -static void ima_reset_appraise_flags(struct inode *inode) +static void ima_reset_appraise_flags(struct inode *inode, int digsig) { struct integrity_iint_cache *iint; @@ -353,18 +353,22 @@ static void ima_reset_appraise_flags(struct inode *inode) return; iint->flags &= ~IMA_DONE_MASK; + if (digsig) + iint->flags |= IMA_DIGSIG; return; } int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len) { + const struct evm_ima_xattr_data *xvalue = xattr_value; int result; result = ima_protect_xattr(dentry, xattr_name, xattr_value, xattr_value_len); if (result == 1) { - ima_reset_appraise_flags(dentry->d_inode); + ima_reset_appraise_flags(dentry->d_inode, + (xvalue->type == EVM_IMA_XATTR_DIGSIG) ? 1 : 0); result = 0; } return result; @@ -376,7 +380,7 @@ int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) result = ima_protect_xattr(dentry, xattr_name, NULL, 0); if (result == 1) { - ima_reset_appraise_flags(dentry->d_inode); + ima_reset_appraise_flags(dentry->d_inode, 0); result = 0; } return result; |