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

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.. 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>
This commit is contained in:
Linus Torvalds 2007-05-08 20:10:00 -07:00
parent 1efd48b3ae
commit 7b82dc0e64
1 changed files with 3 additions and 0 deletions
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3
fs/open.c
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@ -210,6 +210,9 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
newattrs.ia_valid |= ATTR_FILE; 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); mutex_lock(&dentry->d_inode->i_mutex);
err = notify_change(dentry, &newattrs); err = notify_change(dentry, &newattrs);
mutex_unlock(&dentry->d_inode->i_mutex); mutex_unlock(&dentry->d_inode->i_mutex);