From e71b9dff0634edb127f449e076e883ef24a8c76c Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Fri, 16 Sep 2016 12:44:20 +0200 Subject: [PATCH] ima: use file_dentry() Ima tries to call ->setxattr() on overlayfs dentry after having locked underlying inode, which results in a deadlock. Reported-by: Krisztian Litkey Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay") Signed-off-by: Miklos Szeredi Cc: # v4.2 Cc: Mimi Zohar --- security/integrity/ima/ima_appraise.c | 4 ++-- security/integrity/ima/ima_main.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 4b9b4a4e1b89..ef1e4e701780 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -190,7 +190,7 @@ int ima_appraise_measurement(enum ima_hooks func, { static const char op[] = "appraise_data"; char *cause = "unknown"; - struct dentry *dentry = file->f_path.dentry; + struct dentry *dentry = file_dentry(file); struct inode *inode = d_backing_inode(dentry); enum integrity_status status = INTEGRITY_UNKNOWN; int rc = xattr_len, hash_start = 0; @@ -295,7 +295,7 @@ out: */ void ima_update_xattr(struct integrity_iint_cache *iint, struct file *file) { - struct dentry *dentry = file->f_path.dentry; + struct dentry *dentry = file_dentry(file); int rc = 0; /* do not collect and update hash for digital signatures */ diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 596ef616ac21..423d111b3b94 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -228,7 +228,7 @@ static int process_measurement(struct file *file, char *buf, loff_t size, if ((action & IMA_APPRAISE_SUBMASK) || strcmp(template_desc->name, IMA_TEMPLATE_IMA_NAME) != 0) /* read 'security.ima' */ - xattr_len = ima_read_xattr(file->f_path.dentry, &xattr_value); + xattr_len = ima_read_xattr(file_dentry(file), &xattr_value); hash_algo = ima_get_hash_algo(xattr_value, xattr_len); -- 2.20.1