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[PATCH] fix MAY_CHDIR/MAY_ACCESS/LOOKUP_ACCESS mess

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* MAY_CHDIR is redundant - it's an equivalent of MAY_ACCESS
* MAY_ACCESS on fuse should affect only the last step of pathname resolution
* fchdir() and chroot() should pass MAY_ACCESS, for the same reason why
  chdir() needs that.
* now that we pass MAY_ACCESS explicitly in all cases, LOOKUP_ACCESS can be
  removed; it has no business being in nameidata.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2008-07-17 09:19:08 -04:00
parent 7f2da1e7d0
commit a110343f0d
5 changed files with 7 additions and 11 deletions
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10
fs/open.c
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@@ -457,11 +457,11 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
old_cap = cap_set_effective(current->cap_permitted);
}
res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
if (res)
goto out;
res = vfs_permission(&nd, mode);
res = vfs_permission(&nd, mode | MAY_ACCESS);
/* SuS v2 requires we report a read only fs too */
if(res || !(mode & S_IWOTH) ||
special_file(nd.path.dentry->d_inode->i_mode))
@@ -505,7 +505,7 @@ asmlinkage long sys_chdir(const char __user * filename)
if (error)
goto out;
error = vfs_permission(&nd, MAY_EXEC | MAY_CHDIR);
error = vfs_permission(&nd, MAY_EXEC | MAY_ACCESS);
if (error)
goto dput_and_out;
@@ -534,7 +534,7 @@ asmlinkage long sys_fchdir(unsigned int fd)
if (!S_ISDIR(inode->i_mode))
goto out_putf;
error = file_permission(file, MAY_EXEC);
error = file_permission(file, MAY_EXEC | MAY_ACCESS);
if (!error)
set_fs_pwd(current->fs, &file->f_path);
out_putf:
@@ -552,7 +552,7 @@ asmlinkage long sys_chroot(const char __user * filename)
if (error)
goto out;
error = vfs_permission(&nd, MAY_EXEC);
error = vfs_permission(&nd, MAY_EXEC | MAY_ACCESS);
if (error)
goto dput_and_out;