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authorMimi Zohar <zohar@linux.vnet.ibm.com>2014-03-17 23:24:18 -0400
committerMimi Zohar <zohar@linux.vnet.ibm.com>2014-06-12 17:58:05 -0400
commit060bdebfb0b82751be89c0ce4b6e2c88606a354b (patch)
treeb3b8253420850eb54927da9f68e41d9ad074ac6f /security
parent0e04c641b199435f3779454055f6a7de258ecdfc (diff)
downloadlinux-060bdebfb0b82751be89c0ce4b6e2c88606a354b.tar.bz2
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')
-rw-r--r--security/integrity/ima/ima_appraise.c10
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;