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Don't show init_itable=n in /proc/fs/ext4/<dev>/options when filesystem
is mounted with noinit_itable.
Signed-off-by: Tyson Nottingham <tgnottingham@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Previously, /proc/fs/ext4/<dev>/options would only show binary options
if they were set (1 in the options bit mask). E.g. it would show "grpid"
if it was set, but it would not show "nogrpid" if grpid was not set.
This seems sensible, but when an option is absent from the file, it can
be hard for the unfamiliar to know what is being used. E.g. if there
isn't a (no)grpid entry, nogrpid is in effect. But if there isn't a
(no)auto_da_alloc entry, auto_da_alloc is in effect. If there isn't a
(minixdf|bsddf) entry, it turns out bsddf is in effect. It all depends
on how the option is implemented.
It's clearer to be explicit, so print the corresponding option
regardless of whether it means a 1 or a 0 in the bit mask.
Note that options which do not have an explicit disable option aren't
indicated as being disabled even with this change (e.g. dax).
Signed-off-by: Tyson Nottingham <tgnottingham@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Replace kset with generic kobject provided by kobject_create_and_add(),
since the latter is sufficient.
Signed-off-by: Tyson Nottingham <tgnottingham@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Make cleanup of ext4_feat kobject consistent with similar objects.
Signed-off-by: Tyson Nottingham <tgnottingham@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
If some metadata block, such as an allocation bitmap, overlaps the
superblock, it's very likely that if the file system is mounted
read/write, the results will not be pretty. So disallow r/w mounts
for file systems corrupted in this particular way.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
If the root directory has an i_links_count of zero, then when the file
system is mounted, then when ext4_fill_super() notices the problem and
tries to call iput() the root directory in the error return path,
ext4_evict_inode() will try to free the inode on disk, before all of
the file system structures are set up, and this will result in an OOPS
caused by a NULL pointer dereference.
This issue has been assigned CVE-2018-1092.
https://bugzilla.kernel.org/show_bug.cgi?id=199179https://bugzilla.redhat.com/show_bug.cgi?id=1560777
Reported-by: Wen Xu <wen.xu@gatech.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
ext4 isn't validating the sizes of xattrs where the value of the xattr
is stored in an external inode. This is problematic because
->e_value_size is a u32, but ext4_xattr_get() returns an int. A very
large size is misinterpreted as an error code, which ext4_get_acl()
translates into a bogus ERR_PTR() for which IS_ERR() returns false,
causing a crash.
Fix this by validating that all xattrs are <= INT_MAX bytes.
This issue has been assigned CVE-2018-1095.
https://bugzilla.kernel.org/show_bug.cgi?id=199185https://bugzilla.redhat.com/show_bug.cgi?id=1560793
Reported-by: Wen Xu <wen.xu@gatech.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Fixes: e50e5129f384 ("ext4: xattr-in-inode support")
"mark_unwritten" in comment and "unwritten" in the function arguments
is mismatched.
Signed-off-by: zhenwei.pi <zhenwei.pi@youruncloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Code cleanup. Instead of writing an internal static function, use the
available generic_writepages().
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
If mount is auto-probing for filesystem type, it will try various
filesystems in order, with the MS_SILENT flag set. We get
that flag as the silent arg to ext4_fill_super.
If we're probing (silent==1) then don't complain about feature
incompatibilities that are found if it looks like it's actually
a different valid extN type - failed probes should be silent
in this case.
If the on-disk features are unknown even to ext4, then complain.
Reported-by: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Tested-by: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Commit 16c54688592c ("ext4: Allow parallel DIO reads") reworked the way
locking happens around parallel dio reads. This resulted in obviating
the need for EXT4_STATE_DIOREAD_LOCK flag and accompanying logic.
Currently this amounts to dead code so let's remove it. No functional
changes
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
ext4_iomap_begin() has a bug where offset returned in the iomap
structure will be truncated to unsigned long size. On 64-bit
architectures this is fine but on 32-bit architectures obviously not.
Not many places actually use the offset stored in the iomap structure
but one of visible failures is in SEEK_HOLE / SEEK_DATA implementation.
If we create a file like:
dd if=/dev/urandom of=file bs=1k seek=8m count=1
then
lseek64("file", 0x100000000ULL, SEEK_DATA)
wrongly returns 0x100000000 on unfixed kernel while it should return
0x200000000. Avoid the overflow by proper type cast.
Fixes: 545052e9e35a ("ext4: Switch to iomap for SEEK_HOLE / SEEK_DATA")
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org # v4.15
Currently in ext4 direct write path, we update i_disksize only when
new eof is greater than i_size, and don't update it even when new
eof is greater than i_disksize but less than i_size. This doesn't
work well with delalloc buffer write, which updates i_size and
i_disksize only when delalloc blocks are resolved (at writeback
time), the i_disksize from direct write can be lost if a previous
buffer write succeeded at write time but failed at writeback time,
then results in corrupted ondisk inode size.
Consider this case, first buffer write 4k data to a new file at
offset 16k with delayed allocation, then direct write 4k data to the
same file at offset 4k before delalloc blocks are resolved, which
doesn't update i_disksize because it writes within i_size(20k), but
the extent tree metadata has been committed in journal. Then
writeback of the delalloc blocks fails (due to device error etc.),
and i_size/i_disksize from buffer write can't be written to disk
(still zero). A subsequent umount/mount cycle recovers journal and
writes extent tree metadata from direct write to disk, but with
i_disksize being zero.
Fix it by updating i_disksize too in direct write path when new eof
is greater than i_disksize but less than i_size, so i_disksize is
always consistent with direct write.
This fixes occasional i_size corruption in fstests generic/475.
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
i_disksize update should be protected by i_data_sem, by either taking
the lock explicitly or by using ext4_update_i_disksize() helper. But the
i_disksize updates in ext4_direct_IO_write() are not protected at all,
which may be racing with i_disksize updates in writeback path in
delalloc buffer write path.
This is found by code inspection, and I didn't hit any i_disksize
corruption due to this bug. Thanks to Jan Kara for catching this bug and
suggesting the fix!
Reported-by: Jan Kara <jack@suse.cz>
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
When reading the inode or block allocation bitmap, if the bitmap needs
to be initialized, do not update the checksum in the block group
descriptor. That's because we're not set up to journal those changes.
Instead, just set the verified bit on the bitmap block, so that it's
not necessary to validate the checksum.
When a block or inode allocation actually happens, at that point the
checksum will be calculated, and update of the bg descriptor block
will be properly journalled.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
This updates the jbd2 superblock unnecessarily, and on an abort we
shouldn't truncate the log.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Previously the jbd2 layer assumed that a file system check would be
required after a journal abort. In the case of the deliberate file
system shutdown, this should not be necessary. Allow the jbd2 layer
to distinguish between these two cases by using the ESHUTDOWN errno.
Also add proper locking to __journal_abort_soft().
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
The msleep() when processing EXT4_GOING_FLAGS_NOLOGFLUSH was a hack to
avoid some races (that are now fixed), but in fact it introduced its
own race.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
The ext4 forced shutdown flag needs to prevent new handles from being
started, but it needs to allow existing handles to complete. So the
forced shutdown flag should not force ext4_journal_get_write_access to
fail.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
There were two error messages emitted by jbd2, one for a bad checksum
for a jbd2 descriptor block, and one for a bad checksum for a jbd2
data block. Change the data block checksum error so that the two can
be disambiguated.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
with de-mangling cleanups yet to come.
NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do. But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.
The next patch from Al will sort out the final differences, and we
should be all done.
Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull more poll annotation updates from Al Viro:
"This is preparation to solving the problems you've mentioned in the
original poll series.
After this series, the kernel is ready for running
for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
done
as a for bulk search-and-replace.
After that, the kernel is ready to apply the patch to unify
{de,}mangle_poll(), and then get rid of kernel-side POLL... uses
entirely, and we should be all done with that stuff.
Basically, that's what you suggested wrt KPOLL..., except that we can
use EPOLL... instead - they already are arch-independent (and equal to
what is currently kernel-side POLL...).
After the preparations (in this series) switch to returning EPOLL...
from ->poll() instances is completely mechanical and kernel-side
POLL... can go away. The last step (killing kernel-side POLL... and
unifying {de,}mangle_poll() has to be done after the
search-and-replace job, since we need userland-side POLL... for
unified {de,}mangle_poll(), thus the cherry-pick at the last step.
After that we will have:
- POLL{IN,OUT,...} *not* in __poll_t, so any stray instances of
->poll() still using those will be caught by sparse.
- eventpoll.c and select.c warning-free wrt __poll_t
- no more kernel-side definitions of POLL... - userland ones are
visible through the entire kernel (and used pretty much only for
mangle/demangle)
- same behavior as after the first series (i.e. sparc et.al. epoll(2)
working correctly)"
* 'work.poll2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
annotate ep_scan_ready_list()
ep_send_events_proc(): return result via esed->res
preparation to switching ->poll() to returning EPOLL...
add EPOLLNVAL, annotate EPOLL... and event_poll->event
use linux/poll.h instead of asm/poll.h
xen: fix poll misannotation
smc: missing poll annotations
Pull misc vfs fixes from Al Viro.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
seq_file: fix incomplete reset on read from zero offset
kernfs: fix regression in kernfs_fop_write caused by wrong type
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Merge tag '4.16-minor-rc-SMB3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"There are a couple additional security fixes that are still being
tested that are not in this set."
* tag '4.16-minor-rc-SMB3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
Add missing structs and defines from recent SMB3.1.1 documentation
address lock imbalance warnings in smbdirect.c
cifs: silence compiler warnings showing up with gcc-8.0.0
Add some missing debug fields in server and tcon structs
But it's also a fairly small update this time around. Some cleanup,
RDMA fixes, overlayfs fixes, and a fix for an NFSv4 state bug.
The bigger deal for nfsd this time around is Jeff Layton's
already-merged i_version patches. This series has a minor conflict with
that one, and the resolution should be obvious. (Stephen Rothwell has
been carrying it in linux-next for what it's worth.)
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Merge tag 'nfsd-4.16' of git://linux-nfs.org/~bfields/linux
Pull nfsd update from Bruce Fields:
"A fairly small update this time around. Some cleanup, RDMA fixes,
overlayfs fixes, and a fix for an NFSv4 state bug.
The bigger deal for nfsd this time around was Jeff Layton's
already-merged i_version patches"
* tag 'nfsd-4.16' of git://linux-nfs.org/~bfields/linux:
svcrdma: Fix Read chunk round-up
NFSD: hide unused svcxdr_dupstr()
nfsd: store stat times in fill_pre_wcc() instead of inode times
nfsd: encode stat->mtime for getattr instead of inode->i_mtime
nfsd: return RESOURCE not GARBAGE_ARGS on too many ops
nfsd4: don't set lock stateid's sc_type to CLOSED
nfsd: Detect unhashed stids in nfsd4_verify_open_stid()
sunrpc: remove dead code in svc_sock_setbufsize
svcrdma: Post Receives in the Receive completion handler
nfsd4: permit layoutget of executable-only files
lockd: convert nlm_rqst.a_count from atomic_t to refcount_t
lockd: convert nlm_lockowner.count from atomic_t to refcount_t
lockd: convert nsm_handle.sm_count from atomic_t to refcount_t
1. don't pass garbage return codes back up the call chain (Mike Marshall)
2. fix stale inode test (Martin Brandenburg)
3. fix off-by-one errors (Xiongfeng Wang)
Also: add Martin as a reviewer in the Maintainers file.
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Merge tag 'for-linus-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux
Pull orangefs updates from Mike Marshall:
"Mostly cleanups, but three bug fixes:
- don't pass garbage return codes back up the call chain (Mike
Marshall)
- fix stale inode test (Martin Brandenburg)
- fix off-by-one errors (Xiongfeng Wang)
Also add Martin as a reviewer in the Maintainers file"
* tag 'for-linus-4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux:
orangefs: reverse sense of is-inode-stale test in d_revalidate
orangefs: simplify orangefs_inode_is_stale
Orangefs: don't propogate whacky error codes
orangefs: use correct string length
orangefs: make orangefs_make_bad_inode static
orangefs: remove ORANGEFS_KERNEL_DEBUG
orangefs: remove gossip_ldebug and gossip_lerr
orangefs: make orangefs_client_debug_init static
MAINTAINERS: update orangefs list and add myself as reviewer
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Merge tag 'afs-next-20180208' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull afs updates from David Howells:
"Four fixes:
- add a missing put
- two fixes to reset the address iteration cursor correctly
- fix setting up the fileserver iteration cursor.
Two cleanups:
- remove some dead code
- rearrange a function to be more logically laid out
And one new feature:
- Support AFS dynamic root.
With this one should be able to do, say:
mkdir /afs
mount -t afs none /afs -o dyn
to create a dynamic root and then, provided you have keyutils
installed, do:
ls /afs/grand.central.org
and:
ls /afs/umich.edu
to list the root volumes of both those organisations' AFS cells
without requiring any other setup (the kernel upcall to a program
in the keyutils package to do DNS access as does NFS)"
* tag 'afs-next-20180208' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
afs: Support the AFS dynamic root
afs: Rearrange afs_select_fileserver() a little
afs: Remove unused code
afs: Fix server list handling
afs: Need to clear responded flag in addr cursor
afs: Fix missing cursor clearance
afs: Add missing afs_put_cell()
big ticket items slated for the next merge window.
On the CephFS side we have a large number of cap handling improvements,
a fix for our long-standing abuse of ->journal_info in ceph_readpages()
and yet another dentry pointer management patch.
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Merge tag 'ceph-for-4.16-rc1' of git://github.com/ceph/ceph-client
Pull ceph updates from Ilya Dryomov:
"Things have been very quiet on the rbd side, as work continues on the
big ticket items slated for the next merge window.
On the CephFS side we have a large number of cap handling
improvements, a fix for our long-standing abuse of ->journal_info in
ceph_readpages() and yet another dentry pointer management patch"
* tag 'ceph-for-4.16-rc1' of git://github.com/ceph/ceph-client:
ceph: improving efficiency of syncfs
libceph: check kstrndup() return value
ceph: try to allocate enough memory for reserved caps
ceph: fix race of queuing delayed caps
ceph: delete unreachable code in ceph_check_caps()
ceph: limit rate of cap import/export error messages
ceph: fix incorrect snaprealm when adding caps
ceph: fix un-balanced fsc->writeback_count update
ceph: track read contexts in ceph_file_info
ceph: avoid dereferencing invalid pointer during cached readdir
ceph: use atomic_t for ceph_inode_info::i_shared_gen
ceph: cleanup traceless reply handling for rename
ceph: voluntarily drop Fx cap for readdir request
ceph: properly drop caps for setattr request
ceph: voluntarily drop Lx cap for link/rename requests
ceph: voluntarily drop Ax cap for requests that create new inode
rbd: whitelist RBD_FEATURE_OPERATIONS feature bit
rbd: don't NULL out ->obj_request in rbd_img_obj_parent_read_full()
rbd: use kmem_cache_zalloc() in rbd_img_request_create()
rbd: obj_request->completion is unused
Commit b9f5fb1800d8 ("cramfs: fix MTD dependency") did what it says.
Since commit 9059a3493efe ("kconfig: fix relational operators for bool
and tristate symbols") it is possible to do it slightly better though.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
There is now only one caller left for svcxdr_dupstr() and this is inside
of an #ifdef, so we can get a warning when the option is disabled:
fs/nfsd/nfs4xdr.c:241:1: error: 'svcxdr_dupstr' defined but not used [-Werror=unused-function]
This changes the remaining caller to use a nicer IS_ENABLED() check,
which lets the compiler drop the unused code silently.
Fixes: e40d99e6183e ("NFSD: Clean up symlink argument XDR decoders")
Suggested-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
The time values in stat and inode may differ for overlayfs and stat time
values are the correct ones to use. This is also consistent with the fact
that fill_post_wcc() also stores stat time values.
This means introducing a stat call that could fail, where previously we
were just copying values out of the inode. To be conservative about
changing behavior, we fall back to copying values out of the inode in
the error case. It might be better just to clear fh_pre_saved (though
note the BUG_ON in set_change_info).
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
The values of stat->mtime and inode->i_mtime may differ for overlayfs
and stat->mtime is the correct value to use when encoding getattr.
This is also consistent with the fact that other attr times are also
encoded from stat values.
Both callers of lease_get_mtime() already have the value of stat->mtime,
so the only needed change is that lease_get_mtime() will not overwrite
this value with inode->i_mtime in case the inode does not have an
exclusive lease.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
A client that sends more than a hundred ops in a single compound
currently gets an rpc-level GARBAGE_ARGS error.
It would be more helpful to return NFS4ERR_RESOURCE, since that gives
the client a better idea how to recover (for example by splitting up the
compound into smaller compounds).
This is all a bit academic since we've never actually seen a reason for
clients to send such long compounds, but we may as well fix it.
While we're there, just use NFSD4_MAX_OPS_PER_COMPOUND == 16, the
constant we already use in the 4.1 case, instead of hard-coding 100.
Chances anyone actually uses even 16 ops per compound are small enough
that I think there's a neglible risk or any regression.
This fixes pynfs test COMP6.
Reported-by: "Lu, Xinyu" <luxy.fnst@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Merge tag 'iversion-v4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux
Pull inode->i_version cleanup from Jeff Layton:
"Goffredo went ahead and sent a patch to rename this function, and
reverse its sense, as we discussed last week.
The patch is very straightforward and I figure it's probably best to
go ahead and merge this to get the API as settled as possible"
* tag 'iversion-v4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
Pull UDF and ext2 fixlets from Jan Kara:
"A UDF fix and an ext2 cleanup"
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
ext2: drop unneeded newline
udf: Sanitize nanoseconds for time stamps
The last two updates to MS-SMB2 protocol documentation added various
flags and structs (especially relating to SMB3.1.1 tree connect).
Add missing defines and structs to smb2pdu.h
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Although at least one of these was an overly strict sparse warning
in the new smbdirect code, it is cleaner to fix - so no warnings.
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
This bug was fixed before, but came up again with the latest
compiler in another function:
fs/cifs/cifssmb.c: In function 'CIFSSMBSetEA':
fs/cifs/cifssmb.c:6362:3: error: 'strncpy' offset 8 is out of the bounds [0, 4] [-Werror=array-bounds]
strncpy(parm_data->list[0].name, ea_name, name_len);
Let's apply the same fix that was used for the other instances.
Fixes: b2a3ad9ca502 ("cifs: silence compiler warnings showing up with gcc-4.7.0")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steve French <smfrench@gmail.com>
Allow dumping out debug information on dialect, signing, unix extensions
and encryption
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
The pipe buffer limits are accessed without any locking, and may be
changed at any time by the sysctl handlers. In theory this could cause
problems for expressions like the following:
pipe_user_pages_hard && user_bufs > pipe_user_pages_hard
... since the assembly code might reference the 'pipe_user_pages_hard'
memory location multiple times, and if the admin removes the limit by
setting it to 0, there is a very brief window where processes could
incorrectly observe the limit to be exceeded.
Fix this by loading the limits with READ_ONCE() prior to use.
Link: http://lkml.kernel.org/r/20180111052902.14409-8-ebiggers3@gmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
round_pipe_size() calculates the number of pages the requested size
corresponds to, then rounds the page count up to the next power of 2.
However, it also rounds everything < PAGE_SIZE up to PAGE_SIZE.
Therefore, there's no need to actually translate the size into a page
count; we just need to round the size up to the next power of 2.
We do need to verify the size isn't greater than (1 << 31), since on
32-bit systems roundup_pow_of_two() would be undefined in that case. But
that can just be combined with the UINT_MAX check which we need anyway
now.
Finally, update pipe_set_size() to not redundantly check the return value
of round_pipe_size() for the "invalid size" case twice.
Link: http://lkml.kernel.org/r/20180111052902.14409-7-ebiggers3@gmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
A pipe's size is represented as an 'unsigned int'. As expected, writing a
value greater than UINT_MAX to /proc/sys/fs/pipe-max-size fails with
EINVAL. However, the F_SETPIPE_SZ fcntl silently truncates such values to
32 bits, rather than failing with EINVAL as expected. (It *does* fail
with EINVAL for values above (1 << 31) but <= UINT_MAX.)
Fix this by moving the check against UINT_MAX into round_pipe_size() which
is called in both cases.
Link: http://lkml.kernel.org/r/20180111052902.14409-6-ebiggers3@gmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With pipe-user-pages-hard set to 'N', users were actually only allowed up
to 'N - 1' buffers; and likewise for pipe-user-pages-soft.
Fix this to allow up to 'N' buffers, as would be expected.
Link: http://lkml.kernel.org/r/20180111052902.14409-5-ebiggers3@gmail.com
Fixes: b0b91d18e2e9 ("pipe: fix limit checking in pipe_set_size()")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
pipe-user-pages-hard and pipe-user-pages-soft are only supposed to apply
to unprivileged users, as documented in both Documentation/sysctl/fs.txt
and the pipe(7) man page.
However, the capabilities are actually only checked when increasing a
pipe's size using F_SETPIPE_SZ, not when creating a new pipe. Therefore,
if pipe-user-pages-hard has been set, the root user can run into it and be
unable to create pipes. Similarly, if pipe-user-pages-soft has been set,
the root user can run into it and have their pipes limited to 1 page each.
Fix this by allowing the privileged override in both cases.
Link: http://lkml.kernel.org/r/20180111052902.14409-4-ebiggers3@gmail.com
Fixes: 759c01142a5d ("pipe: limit the per-user amount of pages allocated in pipes")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
pipe_proc_fn() is no longer needed, as it only calls through to
proc_dopipe_max_size(). Just put proc_dopipe_max_size() in the ctl_table
entry directly, and remove the unneeded EXPORT_SYMBOL() and the ENOSYS
stub for it.
(The reason the ENOSYS stub isn't needed is that the pipe-max-size
ctl_table entry is located directly in 'kern_table' rather than being
registered separately. Therefore, the entry is already only defined when
the kernel is built with sysctl support.)
Link: http://lkml.kernel.org/r/20180111052902.14409-3-ebiggers3@gmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Luis R . Rodriguez" <mcgrof@kernel.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
