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* Merge branch 'for-linus' of ↵Linus Torvalds2009-09-11
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (57 commits) binfmt_elf: fix PT_INTERP bss handling TPM: Fixup boot probe timeout for tpm_tis driver sysfs: Add labeling support for sysfs LSM/SELinux: inode_{get,set,notify}secctx hooks to access LSM security context information. VFS: Factor out part of vfs_setxattr so it can be called from the SELinux hook for inode_setsecctx. KEYS: Add missing linux/tracehook.h #inclusions KEYS: Fix default security_session_to_parent() Security/SELinux: includecheck fix kernel/sysctl.c KEYS: security_cred_alloc_blank() should return int under all circumstances IMA: open new file for read KEYS: Add a keyctl to install a process's session keyring on its parent [try #6] KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6] KEYS: Do some whitespace cleanups [try #6] KEYS: Make /proc/keys use keyid not numread as file position [try #6] KEYS: Add garbage collection for dead, revoked and expired keys. [try #6] KEYS: Flag dead keys to induce EKEYREVOKED [try #6] KEYS: Allow keyctl_revoke() on keys that have SETATTR but not WRITE perm [try #6] KEYS: Deal with dead-type keys appropriately [try #6] CRED: Add some configurable debugging [try #6] selinux: Support for the new TUN LSM hooks ...
| * Merge branch 'next' into for-linusJames Morris2009-09-10
| |\
| | * IMA: open new file for readMimi Zohar2009-09-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When creating a new file, ima_path_check() assumed the new file was being opened for write. Call ima_path_check() with the appropriate acc_mode so that the read/write counters are incremented correctly. Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
* | | Make 'check_acl()' a first-class filesystem opLinus Torvalds2009-09-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is stage one in flattening out the callchains for the common permission testing. Rather than have most filesystem implement their own inode->i_op->permission function that just calls back down to the VFS layers 'generic_permission()' with the per-filesystem ACL checking function, the filesystem can just expose its 'check_acl' function directly, and let the VFS layer do everything for it. This is all just preparatory - no filesystem actually enables this yet. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Simplify exec_permission_lite(), part 3Linus Torvalds2009-09-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't call down to the generic inode_permission() function just to call the inode-specific permission function - just do it directly. The generic inode_permission() code does things like checking MAY_WRITE and devcgroup_inode_permission(), neither of which are relevant for the light pathname walk permission checks (we always do just MAY_EXEC, and the inode is never a special device). Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Simplify exec_permission_lite() furtherLinus Torvalds2009-09-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This function is only called for path components that are already known to be directories (they have a '->lookup' method). So don't bother doing that whole S_ISDIR() testing, the whole point of the 'lite()' version is that we know that we are looking at a directory component, and that we're only checking name lookup permission. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Simplify exec_permission_lite() logicLinus Torvalds2009-09-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of returning EAGAIN and having the caller do something special for that case, just do the special case directly. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | Do not call 'ima_path_check()' for each path componentLinus Torvalds2009-09-08
|/ / | | | | | | | | | | | | | | | | | | | | | | | | Not only is that a supremely timing-critical path, but it's hopefully some day going to be lockless for the common case, and ima can't do that. Plus the integrity code doesn't even care about non-regular files, so it was always a total waste of time and effort. Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* / IMA: update ima_counts_putMimi Zohar2009-09-06
|/ | | | | | | | | | | | | | - As ima_counts_put() may be called after the inode has been freed, verify that the inode is not NULL, before dereferencing it. - Maintain the IMA file counters in may_open() properly, decrementing any counter increments on subsequent errors. Reported-by: Ciprian Docan <docan@eden.rutgers.edu> Reported-by: J.R. Okajima <hooanon05@yahoo.co.jp> Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Acked-by: Eric Paris <eparis@redhat.com Signed-off-by: James Morris <jmorris@namei.org>
* integrity: add ima_counts_put (updated)Mimi Zohar2009-06-28
| | | | | | | | | | | This patch fixes an imbalance message as reported by J.R. Okajima. The IMA file counters are incremented in ima_path_check. If the actual open fails, such as ETXTBSY, decrement the counters to prevent unnecessary imbalance messages. Reported-by: J.R. Okajima <hooanon05@yahoo.co.jp> Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
* vfs: fix nd->root leak in do_filp_open()J. R. Okajima2009-06-24
| | | | | | | | commit 2a737871108de9ba8930f7650d549f1383767f8b "Cache root in nameidata" introduced a new member nd->root, but forgot to put it in do_filp_open(). Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch lookup_mnt()Al Viro2009-06-11
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch follow_mount()Al Viro2009-06-11
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch follow_down()Al Viro2009-06-11
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* switch follow_up() to struct pathAl Viro2009-06-11
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Make vfs_path_lookup() use starting point as rootAl Viro2009-06-11
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Cache root in nameidataAl Viro2009-06-11
| | | | | | | | | | | | New field: nd->root. When pathname resolution wants to know the root, check if nd->root.mnt is non-NULL; use nd->root if it is, otherwise copy current->fs->root there. After path_walk() is finished, we check if we'd got a cached value in nd->root and drop it. Before calling path_walk() we should either set nd->root.mnt to NULL *or* copy (and pin down) some path to nd->root. In the latter case we won't be looking at current->fs->root at all. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Preparations to caching root in path_walk()Al Viro2009-06-11
| | | | | | | | | | | Split do_path_lookup(), opencode the call from do_filp_open() do_filp_open() is the only caller of do_path_lookup() that cares about root afterwards (it keeps resolving symlinks on O_CREAT path after it'd done LOOKUP_PARENT walk). So when we start caching fs->root in path_walk(), it'll need a different treatment. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'master' into nextJames Morris2009-05-22
|\ | | | | | | | | | | | | | | | | Conflicts: fs/exec.c Removed IMA changes (the IMA checks are now performed via may_open()). Signed-off-by: James Morris <jmorris@namei.org>
| * Switch open_exec() and sys_uselib() to do_open_filp()Al Viro2009-05-09
| | | | | | | | | | | | ... and make path_lookup_open() static Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | integrity: path_check updateMimi Zohar2009-05-21
|/ | | | | | | | | | | - Add support in ima_path_check() for integrity checking without incrementing the counts. (Required for nfsd.) - rename and export opencount_get to ima_counts_get - replace ima_shm_check calls with ima_counts_get - export ima_path_check Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
* Fix i_mutex vs. readdir handling in nfsdDavid Woodhouse2009-04-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 14f7dd63 ("Copy XFS readdir hack into nfsd code") introduced a bug to generic code which had been extant for a long time in the XFS version -- it started to call through into lookup_one_len() and hence into the file systems' ->lookup() methods without i_mutex held on the directory. This patch fixes it by locking the directory's i_mutex again before calling the filldir functions. The original deadlocks which commit 14f7dd63 was designed to avoid are still avoided, because they were due to fs-internal locking, not i_mutex. While we're at it, fix the return type of nfsd_buffered_readdir() which should be a __be32 not an int -- it's an NFS errno, not a Linux errno. And return nfserrno(-ENOMEM) when allocation fails, not just -ENOMEM. Sparse would have caught that, if it wasn't so busy bitching about __cold__. Commit 05f4f678 ("nfsd4: don't do lookup within readdir in recovery code") introduced a similar problem with calling lookup_one_len() without i_mutex, which this patch also addresses. To fix that, it was necessary to fix the called functions so that they expect i_mutex to be held; that part was done by J. Bruce Fields. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Umm-I-can-live-with-that-by: Al Viro <viro@zeniv.linux.org.uk> Reported-by: J. R. Okajima <hooanon05@yahoo.co.jp> Tested-by: J. Bruce Fields <bfields@citi.umich.edu> LKML-Reference: <8036.1237474444@jrobl> Cc: stable@kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Get rid of indirect include of fs_struct.hAl Viro2009-03-31
| | | | | | | | Don't pull it in sched.h; very few files actually need it and those can include directly. sched.h itself only needs forward declaration of struct fs_struct; Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* New helper - current_umask()Al Viro2009-03-31
| | | | | | | current->fs->umask is what most of fs_struct users are doing. Put that into a helper function. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Take fs_struct handling to new file (fs/fs_struct.c)Al Viro2009-03-31
| | | | | | | | | | Pure code move; two new helper functions for nfsd and daemonize (unshare_fs_struct() and daemonize_fs_struct() resp.; for now - the same code as used to be in callers). unshare_fs_struct() exported (for nfsd, as copy_fs_struct()/exit_fs() used to be), copy_fs_struct() and exit_fs() don't need exports anymore. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge branch 'for-linus' of ↵Linus Torvalds2009-03-27
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (37 commits) fs: avoid I_NEW inodes Merge code for single and multiple-instance mounts Remove get_init_pts_sb() Move common mknod_ptmx() calls into caller Parse mount options just once and copy them to super block Unroll essentials of do_remount_sb() into devpts vfs: simple_set_mnt() should return void fs: move bdev code out of buffer.c constify dentry_operations: rest constify dentry_operations: configfs constify dentry_operations: sysfs constify dentry_operations: JFS constify dentry_operations: OCFS2 constify dentry_operations: GFS2 constify dentry_operations: FAT constify dentry_operations: FUSE constify dentry_operations: procfs constify dentry_operations: ecryptfs constify dentry_operations: CIFS constify dentry_operations: AFS ...
| * cleanup may_openChristoph Hellwig2009-03-27
| | | | | | | | | | | | | | | | | | Add a switch for the various i_mode fmt cases, and remove the comment about writeability of devices nodes - that part is handled in inode_permission and comment on (briefly) there. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'for_linus' of ↵Linus Torvalds2009-03-27
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-quota-2.6 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-quota-2.6: (27 commits) ext2: Zero our b_size in ext2_quota_read() trivial: fix typos/grammar errors in fs/Kconfig quota: Coding style fixes quota: Remove superfluous inlines quota: Remove uppercase aliases for quota functions. nfsd: Use lowercase names of quota functions jfs: Use lowercase names of quota functions udf: Use lowercase names of quota functions ufs: Use lowercase names of quota functions reiserfs: Use lowercase names of quota functions ext4: Use lowercase names of quota functions ext3: Use lowercase names of quota functions ext2: Use lowercase names of quota functions ramfs: Remove quota call vfs: Use lowercase names of quota functions quota: Remove dqbuf_t and other cleanups quota: Remove NODQUOT macro quota: Make global quota locks cacheline aligned quota: Move quota files into separate directory ext4: quota reservation for delayed allocation ...
| * | vfs: Use lowercase names of quota functionsJan Kara2009-03-25
| |/ | | | | | | | | | | | | Use lowercase names of quota functions instead of old uppercase ones. Signed-off-by: Jan Kara <jack@suse.cz> CC: Alexander Viro <viro@zeniv.linux.org.uk>
* | Merge branch 'master' into nextJames Morris2009-02-05
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: fs/namei.c Manually merged per: diff --cc fs/namei.c index 734f2b5,bbc15c2..0000000 --- a/fs/namei.c +++ b/fs/namei.c @@@ -860,9 -848,8 +849,10 @@@ static int __link_path_walk(const char nd->flags |= LOOKUP_CONTINUE; err = exec_permission_lite(inode); if (err == -EAGAIN) - err = vfs_permission(nd, MAY_EXEC); + err = inode_permission(nd->path.dentry->d_inode, + MAY_EXEC); + if (!err) + err = ima_path_check(&nd->path, MAY_EXEC); if (err) break; @@@ -1525,14 -1506,9 +1509,14 @@@ int may_open(struct path *path, int acc flag &= ~O_TRUNC; } - error = vfs_permission(nd, acc_mode); + error = inode_permission(inode, acc_mode); if (error) return error; + - error = ima_path_check(&nd->path, ++ error = ima_path_check(path, + acc_mode & (MAY_READ | MAY_WRITE | MAY_EXEC)); + if (error) + return error; /* * An append-only file must be opened in append mode for writing. */ Signed-off-by: James Morris <jmorris@namei.org>
| * [CVE-2009-0029] System call wrappers part 29Heiko Carstens2009-01-14
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * [CVE-2009-0029] System call wrappers part 20Heiko Carstens2009-01-14
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * [CVE-2009-0029] System call wrappers part 15Heiko Carstens2009-01-14
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * [CVE-2009-0029] System call wrappers part 14Heiko Carstens2009-01-14
| | | | | | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
| * Merge branch 'for-linus' of ↵Linus Torvalds2009-01-05
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: inotify: fix type errors in interfaces fix breakage in reiserfs_new_inode() fix the treatment of jfs special inodes vfs: remove duplicate code in get_fs_type() add a vfs_fsync helper sys_execve and sys_uselib do not call into fsnotify zero i_uid/i_gid on inode allocation inode->i_op is never NULL ntfs: don't NULL i_op isofs check for NULL ->i_op in root directory is dead code affs: do not zero ->i_op kill suid bit only for regular files vfs: lseek(fd, 0, SEEK_CUR) race condition
| | * inode->i_op is never NULLAl Viro2009-01-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We used to have rather schizophrenic set of checks for NULL ->i_op even though it had been eliminated years ago. You'd need to go out of your way to set it to NULL explicitly _and_ a bunch of code would die on such inodes anyway. After killing two remaining places that still did that bogosity, all that crap can go away. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | fs: symlink write_begin allocation context fixNick Piggin2009-01-04
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the write_begin/write_end aops, page_symlink was broken because it could no longer pass a GFP_NOFS type mask into the point where the allocations happened. They are done in write_begin, which would always assume that the filesystem can be entered from reclaim. This bug could cause filesystem deadlocks. The funny thing with having a gfp_t mask there is that it doesn't really allow the caller to arbitrarily tinker with the context in which it can be called. It couldn't ever be GFP_ATOMIC, for example, because it needs to take the page lock. The only thing any callers care about is __GFP_FS anyway, so turn that into a single flag. Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on this flag in their write_begin function. Change __grab_cache_page to accept a nofs argument as well, to honour that flag (while we're there, change the name to grab_cache_page_write_begin which is more instructive and does away with random leading underscores). This is really a more flexible way to go in the end anyway -- if a filesystem happens to want any extra allocations aside from the pagecache ones in ints write_begin function, it may now use GFP_KERNEL (rather than GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a random example). [kosaki.motohiro@jp.fujitsu.com: fix ubifs] [kosaki.motohiro@jp.fujitsu.com: fix fuse] Signed-off-by: Nick Piggin <npiggin@suse.de> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: <stable@kernel.org> [2.6.28.x] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [ Cleaned up the calling convention: just pass in the AOP flags untouched to the grab_cache_page_write_begin() function. That just simplifies everybody, and may even allow future expansion of the logic. - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * make INIT_FS use the __RW_LOCK_UNLOCKED initializationSteven Rostedt2008-12-31
| | | | | | | | | | | | | | | | | | [AV: rediffed on top of unification of init_fs] Initialization of init_fs still uses the deprecated RW_LOCK_UNLOCKED macro. This patch updates it to use the __RW_LOCK_UNLOCKED(lock) macro. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * take init_fs to saner placeAl Viro2008-12-31
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * kill vfs_permissionChristoph Hellwig2008-12-31
| | | | | | | | | | | | | | | | | | | | | | | | With all the nameidata removal there's no point anymore for this helper. Of the three callers left two will go away with the next lookup series anyway. Also add proper kerneldoc to inode_permission as this is the main permission check routine now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * pass a struct path * to may_openChristoph Hellwig2008-12-31
| | | | | | | | | | | | | | No need for the nameidata in may_open - a struct path is enough. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * kill walk_init_rootChristoph Hellwig2008-12-31
| | | | | | | | | | | | | | | | walk_init_root is a tiny helper that is marked __always_inline, has just one caller and an unused argument. Just merge it into the caller. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * remove incorrect comment in inode_permissionChristoph Hellwig2008-12-31
| | | | | | | | | | | | | | | | We now pass on all MAY_ flags to the filesystems permission routines, so remove the comment stating the contrary. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * vfs: ensure page symlinks are NUL-terminatedDuane Griffin2008-12-31
| | | | | | | | | | | | | | | | | | | | | | | | On-disk data corruption could cause a page link to have its i_size set to PAGE_SIZE (or a multiple thereof) and its contents all non-NUL. NUL-terminate the link name to ensure this doesn't cause further problems for the kernel. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Duane Griffin <duaneg@dghda.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * introduce new LSM hooks where vfsmount is available.Kentaro Takeda2008-12-31
| | | | | | | | | | | | | | | | | | | | Add new LSM hooks for path-based checks. Call them on directory-modifying operations at the points where we still know the vfsmount involved. Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | integrity: IMA hooksMimi Zohar2009-02-05
|/ | | | | | | | | | This patch replaces the generic integrity hooks, for which IMA registered itself, with IMA integrity hooks in the appropriate places directly in the fs directory. Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
* Merge branch 'master' into nextJames Morris2008-12-04
|\ | | | | | | | | | | | | | | | | | | Conflicts: fs/nfsd/nfs4recover.c Manually fixed above to use new creds API functions, e.g. nfs4_save_creds(). Signed-off-by: James Morris <jmorris@namei.org>
| * don't unlink an active swapfileHugh Dickins2008-11-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Peter Cordes is sorry that he rm'ed his swapfiles while they were in use, he then had no pathname to swapoff. It's a curious little oversight, but not one worth a lot of hackery. Kudos to Willy Tarreau for turning this around from a discussion of synthetic pathnames to how to prevent unlink. Mimic immutable: prohibit unlinking an active swapfile in may_delete() (and don't worry my little head over the tiny race window). Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Willy Tarreau <w@1wt.eu> Acked-by: Christoph Hellwig <hch@infradead.org> Cc: Peter Cordes <peter@cordes.ca> Cc: Bodo Eggert <7eggert@gmx.de> Cc: David Newall <davidn@davidnewall.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | CRED: Wrap task credential accesses in the filesystem subsystemDavid Howells2008-11-13
|/ | | | | | | | | | | | | | | | | Wrap access to task credentials so that they can be separated more easily from the task_struct during the introduction of COW creds. Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id(). Change some task->e?[ug]id to task_e?[ug]id(). In some places it makes more sense to use RCU directly rather than a convenient wrapper; these will be addressed by later patches. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Morris <jmorris@namei.org>
* [PATCH] move executable checking into ->permission()Miklos Szeredi2008-10-23
| | | | | | | | | | | | | | | | | | | | | | | | | For execute permission on a regular files we need to check if file has any execute bits at all, regardless of capabilites. This check is normally performed by generic_permission() but was also added to the case when the filesystem defines its own ->permission() method. In the latter case the filesystem should be responsible for performing this check. Move the check from inode_permission() inside filesystems which are not calling generic_permission(). Create a helper function execute_ok() that returns true if the inode is a directory or if any execute bits are present in i_mode. Also fix up the following code: - coda control file is never executable - sysctl files are never executable - hfs_permission seems broken on MAY_EXEC, remove - hfsplus_permission is eqivalent to generic_permission(), remove Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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