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Revert "ovl: don't allow writing ioctl on lower layer"

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This reverts commit 7c6893e3c9.

Overlayfs no longer relies on the vfs for checking writability of files.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
2018-07-18 15:44:43 +02:00
parent d561f21856
commit 6742cee043
4 changed files with 9 additions and 70 deletions
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9
fs/xattr.c
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@@ -23,7 +23,6 @@
#include <linux/posix_acl_xattr.h>
#include <linux/uaccess.h>
#include "internal.h"
static const char *
strcmp_prefix(const char *a, const char *a_prefix)
@@ -501,10 +500,10 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
if (!f.file)
return error;
audit_file(f.file);
error = mnt_want_write_file_path(f.file);
error = mnt_want_write_file(f.file);
if (!error) {
error = setxattr(f.file->f_path.dentry, name, value, size, flags);
mnt_drop_write_file_path(f.file);
mnt_drop_write_file(f.file);
}
fdput(f);
return error;
@@ -733,10 +732,10 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
if (!f.file)
return error;
audit_file(f.file);
error = mnt_want_write_file_path(f.file);
error = mnt_want_write_file(f.file);
if (!error) {
error = removexattr(f.file->f_path.dentry, name);
mnt_drop_write_file_path(f.file);
mnt_drop_write_file(f.file);
}
fdput(f);
return error;