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authorAl Viro <viro@zeniv.linux.org.uk>2008-07-16 05:03:57 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-07-27 04:53:14 +0400
commite6305c43eda10ebfd2ad9e35d6e172ccc7bb3695 (patch)
tree8a95bd0e27fb3ce895cca9ef91af2e1605e4cdab /fs/namei.c
parent1bd5191d9f5d1928c4efdf604c4164b04bb88dbe (diff)
downloadlinux-e6305c43eda10ebfd2ad9e35d6e172ccc7bb3695.tar.xz
[PATCH] sanitize ->permission() prototype
* kill nameidata * argument; map the 3 bits in ->flags anybody cares about to new MAY_... ones and pass with the mask. * kill redundant gfs2_iop_permission() * sanitize ecryptfs_permission() * fix remaining places where ->permission() instances might barf on new MAY_... found in mask. The obvious next target in that direction is permission(9) folded fix for nfs_permission() breakage from Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 3b26a240ade9..46af98ed136b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -185,6 +185,8 @@ int generic_permission(struct inode *inode, int mask,
{
umode_t mode = inode->i_mode;
+ mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
+
if (current->fsuid == inode->i_uid)
mode >>= 6;
else {
@@ -203,7 +205,7 @@ int generic_permission(struct inode *inode, int mask,
/*
* If the DACs are ok we don't need any capability check.
*/
- if (((mode & mask & (MAY_READ|MAY_WRITE|MAY_EXEC)) == mask))
+ if ((mask & ~mode) == 0)
return 0;
check_capabilities:
@@ -228,7 +230,7 @@ int generic_permission(struct inode *inode, int mask,
int permission(struct inode *inode, int mask, struct nameidata *nd)
{
- int retval, submask;
+ int retval;
struct vfsmount *mnt = NULL;
if (nd)
@@ -261,9 +263,17 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
}
/* Ordinary permission routines do not understand MAY_APPEND. */
- submask = mask & ~MAY_APPEND;
if (inode->i_op && inode->i_op->permission) {
- retval = inode->i_op->permission(inode, submask, nd);
+ int extra = 0;
+ if (nd) {
+ if (nd->flags & LOOKUP_ACCESS)
+ extra |= MAY_ACCESS;
+ if (nd->flags & LOOKUP_CHDIR)
+ extra |= MAY_CHDIR;
+ if (nd->flags & LOOKUP_OPEN)
+ extra |= MAY_OPEN;
+ }
+ retval = inode->i_op->permission(inode, mask | extra);
if (!retval) {
/*
* Exec permission on a regular file is denied if none
@@ -277,7 +287,7 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
return -EACCES;
}
} else {
- retval = generic_permission(inode, submask, NULL);
+ retval = generic_permission(inode, mask, NULL);
}
if (retval)
return retval;
@@ -286,7 +296,8 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
if (retval)
return retval;
- return security_inode_permission(inode, mask, nd);
+ return security_inode_permission(inode,
+ mask & (MAY_READ|MAY_WRITE|MAY_EXEC), nd);
}
/**