From: Linus Torvalds <torvalds@woody.linux-foundation.org>
Date: Wed, 9 May 2007 03:10:00 +0000 (-0700)
Subject: Remove suid/sgid bits on [f]truncate()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7b82dc0e64e93f430182f36b46b79fcee87d3532;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

Remove suid/sgid bits on [f]truncate()

.. to match what we do on write().  This way, people who write to files
by using [f]truncate + writable mmap have the same semantics as if they
were using the write() family of system calls.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/open.c b/fs/open.c
index ca9981c4a658..0d515d161974 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -210,6 +210,9 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 		newattrs.ia_valid |= ATTR_FILE;
 	}
 
+	/* Remove suid/sgid on truncate too */
+	newattrs.ia_valid |= should_remove_suid(dentry);
+
 	mutex_lock(&dentry->d_inode->i_mutex);
 	err = notify_change(dentry, &newattrs);
 	mutex_unlock(&dentry->d_inode->i_mutex);