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vfs: re-introduce MAY_CHDIR

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Currently MAY_ACCESS means that filesystems must check the permissions
right then and not rely on cached results or the results of future
operations on the object.  This can be because of a call to sys_access() or
because of a call to chdir() which needs to check search without relying on
any future operations inside that dir.  I plan to use MAY_ACCESS for other
purposes in the security system, so I split the MAY_ACCESS and the
MAY_CHDIR cases.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by:  Stephen D. Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2010-07-23 11:43:51 -04:00 committed by James Morris
parent 692a8a231b
commit 9cfcac810e
4 changed files with 6 additions and 5 deletions
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2
fs/fuse/dir.c
View File

@ -1016,7 +1016,7 @@ static int fuse_permission(struct inode *inode, int mask)
exist. So if permissions are revoked this won't be exist. So if permissions are revoked this won't be
noticed immediately, only after the attribute noticed immediately, only after the attribute
timeout has expired */ timeout has expired */
} else if (mask & MAY_ACCESS) { } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
err = fuse_access(inode, mask); err = fuse_access(inode, mask);
} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) { } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
if (!(inode->i_mode & S_IXUGO)) { if (!(inode->i_mode & S_IXUGO)) {

2
fs/nfs/dir.c
View File

@ -1953,7 +1953,7 @@ int nfs_permission(struct inode *inode, int mask)
if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
goto out; goto out;
/* Is this sys_access() ? */ /* Is this sys_access() ? */
if (mask & MAY_ACCESS) if (mask & (MAY_ACCESS | MAY_CHDIR))
goto force_lookup; goto force_lookup;
switch (inode->i_mode & S_IFMT) { switch (inode->i_mode & S_IFMT) {

6
fs/open.c
View File

@ -366,7 +366,7 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
if (error) if (error)
goto out; goto out;
error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
if (error) if (error)
goto dput_and_out; goto dput_and_out;
@ -395,7 +395,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
if (!S_ISDIR(inode->i_mode)) if (!S_ISDIR(inode->i_mode))
goto out_putf; goto out_putf;
error = inode_permission(inode, MAY_EXEC | MAY_ACCESS); error = inode_permission(inode, MAY_EXEC | MAY_CHDIR);
if (!error) if (!error)
set_fs_pwd(current->fs, &file->f_path); set_fs_pwd(current->fs, &file->f_path);
out_putf: out_putf:
@ -413,7 +413,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
if (error) if (error)
goto out; goto out;
error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
if (error) if (error)
goto dput_and_out; goto dput_and_out;

1
include/linux/fs.h
View File

@ -53,6 +53,7 @@ struct inodes_stat_t {
#define MAY_APPEND 8 #define MAY_APPEND 8
#define MAY_ACCESS 16 #define MAY_ACCESS 16
#define MAY_OPEN 32 #define MAY_OPEN 32
#define MAY_CHDIR 64
/* /*
* flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond