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Sanitize exec_permission_lite() 

Use the sucker in other places in pathname resolution
that check MAY_EXEC for directories; lose the _lite
from name, it's equivalent of full-blown inode_permission()
for its callers (albeit still lighter, since large parts
of generic_permission() do not apply for pure MAY_EXEC).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-12-16 01:01:38 -05:00
parent 6e6b1bd1e7
commit b75b5086be
1 changed files with 8 additions and 9 deletions
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17
fs/namei.c
View File

@ -412,16 +412,15 @@ do_revalidate(struct dentry *dentry, struct nameidata *nd)
}
/*
* Short-cut version of permission(), for calling by
* path_walk(), when dcache lock is held. Combines parts
* of permission() and generic_permission(), and tests ONLY for
* MAY_EXEC permission.
* Short-cut version of permission(), for calling on directories
* during pathname resolution. Combines parts of permission()
* and generic_permission(), and tests ONLY for MAY_EXEC permission.
*
* If appropriate, check DAC only. If not appropriate, or
* short-cut DAC fails, then call permission() to do more
* short-cut DAC fails, then call ->permission() to do more
* complete permission check.
*/
static int exec_permission_lite(struct inode *inode)
static int exec_permission(struct inode *inode)
{
int ret;
@ -807,7 +806,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
unsigned int c;
nd->flags |= LOOKUP_CONTINUE;
err = exec_permission_lite(inode);
err = exec_permission(inode);
if (err)
break;
@ -1155,7 +1154,7 @@ static struct dentry *lookup_hash(struct nameidata *nd)
{
int err;
err = inode_permission(nd->path.dentry->d_inode, MAY_EXEC);
err = exec_permission(nd->path.dentry->d_inode);
if (err)
return ERR_PTR(err);
return __lookup_hash(&nd->last, nd->path.dentry, nd);
@ -1205,7 +1204,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
if (err)
return ERR_PTR(err);
err = inode_permission(base->d_inode, MAY_EXEC);
err = exec_permission(base->d_inode);
if (err)
return ERR_PTR(err);
return __lookup_hash(&this, base, NULL);