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authorLinus Torvalds <torvalds@g5.osdl.org>2006-10-21 10:01:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-21 10:01:52 -0700
commit7b7fc708b568a258595e1fa911b930a75ac07b48 (patch)
tree5c77a5397d01c91aaa59ee5517af28afee32afcb /mm
parentc7a3bd177f248d01ee18a01d22048c80e071c331 (diff)
parent8c34e2d63231d4bf4852bac8521883944d770fe3 (diff)
Merge branch 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'splice' of git://brick.kernel.dk/data/git/linux-2.6-block: [PATCH] Remove SUID when splicing into an inode [PATCH] Add lockless helpers for remove_suid() [PATCH] Introduce generic_file_splice_write_nolock() [PATCH] Take i_mutex in splice_from_pipe()
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 8558732e85c..cb26e33fd0f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1884,11 +1884,10 @@ repeat:
* if suid or (sgid and xgrp)
* remove privs
*/
-int remove_suid(struct dentry *dentry)
+int should_remove_suid(struct dentry *dentry)
{
mode_t mode = dentry->d_inode->i_mode;
int kill = 0;
- int result = 0;
/* suid always must be killed */
if (unlikely(mode & S_ISUID))
@@ -1901,13 +1900,28 @@ int remove_suid(struct dentry *dentry)
if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
kill |= ATTR_KILL_SGID;
- if (unlikely(kill && !capable(CAP_FSETID))) {
- struct iattr newattrs;
+ if (unlikely(kill && !capable(CAP_FSETID)))
+ return kill;
- newattrs.ia_valid = ATTR_FORCE | kill;
- result = notify_change(dentry, &newattrs);
- }
- return result;
+ return 0;
+}
+
+int __remove_suid(struct dentry *dentry, int kill)
+{
+ struct iattr newattrs;
+
+ newattrs.ia_valid = ATTR_FORCE | kill;
+ return notify_change(dentry, &newattrs);
+}
+
+int remove_suid(struct dentry *dentry)
+{
+ int kill = should_remove_suid(dentry);
+
+ if (unlikely(kill))
+ return __remove_suid(dentry, kill);
+
+ return 0;
}
EXPORT_SYMBOL(remove_suid);