Some operations, like searching a directory path or connecting a unix domain
socket, make explicit calls into inode_permission. Our choices are to
either try to come up with a signature for all of the explicit calls to
inode_permission and do not check open on those, or to move the open checks to
dentry_open where we know this is always an open operation. This patch moves
the checks to dentry_open.
Signed-off-by: Eric Paris <eparis@xxxxxxxxxx>
---
security/selinux/hooks.c | 59 +++++++++++++++++++++++-----------------------
1 files changed, 30 insertions(+), 29 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3e3fde7..47cba68 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1687,15 +1687,39 @@ static inline u32 file_mask_to_av(int mode, int mask)
return av;
}
+/* Convert a Linux file to an access vector. */
+static inline u32 file_to_av(struct file *file)
+{
+ u32 av = 0;
+
+ if (file->f_mode & FMODE_READ)
+ av |= FILE__READ;
+ if (file->f_mode & FMODE_WRITE) {
+ if (file->f_flags & O_APPEND)
+ av |= FILE__APPEND;
+ else
+ av |= FILE__WRITE;
+ }
+ if (!av) {
+ /*
+ * Special file opened with flags 3 for ioctl-only use.
+ */
+ av = FILE__IOCTL;
+ }
+
+ return av;
+}
+
/*
- * Convert a file mask to an access vector and include the correct open
+ * Convert a file to an access vector and include the correct open
* open permission.
*/
-static inline u32 open_file_mask_to_av(int mode, int mask)
+static inline u32 open_file_to_av(struct file *file)
{
- u32 av = file_mask_to_av(mode, mask);
+ u32 av = file_to_av(file);
if (selinux_policycap_openperm) {
+ mode_t mode = file->f_path.dentry->d_inode->i_mode;
/*
* lnk files and socks do not really have an 'open'
*/
@@ -1711,34 +1735,11 @@ static inline u32 open_file_mask_to_av(int mode, int mask)
av |= DIR__OPEN;
else
printk(KERN_ERR "SELinux: WARNING: inside %s with "
- "unknown mode:%x\n", __func__, mode);
+ "unknown mode:%o\n", __func__, mode);
}
return av;
}
-/* Convert a Linux file to an access vector. */
-static inline u32 file_to_av(struct file *file)
-{
- u32 av = 0;
-
- if (file->f_mode & FMODE_READ)
- av |= FILE__READ;
- if (file->f_mode & FMODE_WRITE) {
- if (file->f_flags & O_APPEND)
- av |= FILE__APPEND;
- else
- av |= FILE__WRITE;
- }
- if (!av) {
- /*
- * Special file opened with flags 3 for ioctl-only use.
- */
- av = FILE__IOCTL;
- }
-
- return av;
-}
-
/* Hook functions begin here. */
static int selinux_ptrace_may_access(struct task_struct *child,
@@ -2648,7 +2649,7 @@ static int selinux_inode_permission(struct inode *inode, int mask)
}
return inode_has_perm(current, inode,
- open_file_mask_to_av(inode->i_mode, mask), NULL);
+ file_mask_to_av(inode->i_mode, mask), NULL);
}
static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
@@ -3164,7 +3165,7 @@ static int selinux_dentry_open(struct file *file)
* new inode label or new policy.
* This check is not redundant - do not remove.
*/
- return inode_has_perm(current, inode, file_to_av(file), NULL);
+ return inode_has_perm(current, inode, open_file_to_av(file), NULL);
}
/* task security operations */
--
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