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author | Cong Wang <xiyou.wangcong@gmail.com> | 2012-05-15 06:57:33 (GMT) |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-05-31 01:04:52 (GMT) |
commit | 3ed37648e1cbf1bbebc200c6ea8fd8daf8325843 (patch) | |
tree | 60f27fc77a1e5c9c48790243266367318a3267dc /mm | |
parent | 8bdc81c5069e43755d6e59e5e990e21ca200e8e2 (diff) | |
download | linux-3ed37648e1cbf1bbebc200c6ea8fd8daf8325843.tar.xz |
fs: move file_remove_suid() to fs/inode.c
file_remove_suid() is a generic function operates on struct file,
it almost has no relations with file mapping, so move it to fs/inode.c.
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/filemap.c | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 79c4b2b..21e5abf 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1938,71 +1938,6 @@ struct page *read_cache_page(struct address_space *mapping, } EXPORT_SYMBOL(read_cache_page); -/* - * The logic we want is - * - * if suid or (sgid and xgrp) - * remove privs - */ -int should_remove_suid(struct dentry *dentry) -{ - umode_t mode = dentry->d_inode->i_mode; - int kill = 0; - - /* suid always must be killed */ - if (unlikely(mode & S_ISUID)) - kill = ATTR_KILL_SUID; - - /* - * sgid without any exec bits is just a mandatory locking mark; leave - * it alone. If some exec bits are set, it's a real sgid; kill it. - */ - if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) - kill |= ATTR_KILL_SGID; - - if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) - return kill; - - return 0; -} -EXPORT_SYMBOL(should_remove_suid); - -static int __remove_suid(struct dentry *dentry, int kill) -{ - struct iattr newattrs; - - newattrs.ia_valid = ATTR_FORCE | kill; - return notify_change(dentry, &newattrs); -} - -int file_remove_suid(struct file *file) -{ - struct dentry *dentry = file->f_path.dentry; - struct inode *inode = dentry->d_inode; - int killsuid; - int killpriv; - int error = 0; - - /* Fast path for nothing security related */ - if (IS_NOSEC(inode)) - return 0; - - killsuid = should_remove_suid(dentry); - killpriv = security_inode_need_killpriv(dentry); - - if (killpriv < 0) - return killpriv; - if (killpriv) - error = security_inode_killpriv(dentry); - if (!error && killsuid) - error = __remove_suid(dentry, killsuid); - if (!error && (inode->i_sb->s_flags & MS_NOSEC)) - inode->i_flags |= S_NOSEC; - - return error; -} -EXPORT_SYMBOL(file_remove_suid); - static size_t __iovec_copy_from_user_inatomic(char *vaddr, const struct iovec *iov, size_t base, size_t bytes) { |