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Smack: ignore private inode for file functions

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The access to fd from anon_inode is always failed because there is
no set xattr operations. So this patch fixes to ignore private
inode including anon_inode for file functions.

It was only ignored for smack_file_receive() to share dma-buf fd,
but dma-buf has other functions like ioctl and mmap.

Reference: https://lkml.org/lkml/2015/4/17/16

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Seung-Woo Kim 2016-12-12 17:35:26 +09:00 committed by Casey Schaufler
parent 805b65a80b
commit 83a1e53f39
1 changed files with 12 additions and 0 deletions
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12
security/smack/smack_lsm.c
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@ -1647,6 +1647,9 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd,
struct smk_audit_info ad;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
@ -1676,6 +1679,9 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
int rc;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
@ -1702,6 +1708,9 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
int rc = 0;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
switch (cmd) {
case F_GETLK:
break;
@ -1755,6 +1764,9 @@ static int smack_mmap_file(struct file *file,
if (file == NULL)
return 0;
if (unlikely(IS_PRIVATE(file_inode(file))))
return 0;
isp = file_inode(file)->i_security;
if (isp->smk_mmap == NULL)
return 0;