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make sure that fchdir() won't accept referral points, etc. 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-04-15 15:58:56 -04:00
parent 85128b2be6
commit 159b095628
1 changed files with 3 additions and 6 deletions
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9
fs/open.c
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@ -459,20 +459,17 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
SYSCALL_DEFINE1(fchdir, unsigned int, fd)
{
struct fd f = fdget_raw(fd);
struct inode *inode;
int error = -EBADF;
int error;
error = -EBADF;
if (!f.file)
goto out;
inode = file_inode(f.file);
error = -ENOTDIR;
if (!S_ISDIR(inode->i_mode))
if (!d_can_lookup(f.file->f_path.dentry))
goto out_putf;
error = inode_permission(inode, MAY_EXEC | MAY_CHDIR);
error = inode_permission(file_inode(f.file), MAY_EXEC | MAY_CHDIR);
if (!error)
set_fs_pwd(current->fs, &f.file->f_path);
out_putf: