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path: root/fs/cifs/smb2file.c
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2019-01-11cifs: Fix potential OOB access of lock element arrayRoss Lagerwall
If maxBuf is small but non-zero, it could result in a zero sized lock element array which we would then try and access OOB. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
2019-01-11cifs: Limit memory used by lock request calls to a pageRoss Lagerwall
The code tries to allocate a contiguous buffer with a size supplied by the server (maxBuf). This could fail if memory is fragmented since it results in high order allocations for commonly used server implementations. It is also wasteful since there are probably few locks in the usual case. Limit the buffer to be no larger than a page to avoid memory allocation failures due to fragmentation. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-07-05cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf()Stefano Brivio
smb{2,3}_create_lease_buf() store a lease key in the lease context for later usage on a lease break. In most paths, the key is currently sourced from data that happens to be on the stack near local variables for oplock in SMB2_open() callers, e.g. from open_shroot(), whereas smb2_open_file() properly allocates space on its stack for it. The address of those local variables holding the oplock is then passed to create_lease_buf handlers via SMB2_open(), and 16 bytes near oplock are used. This causes a stack out-of-bounds access as reported by KASAN on SMB2.1 and SMB3 mounts (first out-of-bounds access is shown here): [ 111.528823] BUG: KASAN: stack-out-of-bounds in smb3_create_lease_buf+0x399/0x3b0 [cifs] [ 111.530815] Read of size 8 at addr ffff88010829f249 by task mount.cifs/985 [ 111.532838] CPU: 3 PID: 985 Comm: mount.cifs Not tainted 4.18.0-rc3+ #91 [ 111.534656] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 111.536838] Call Trace: [ 111.537528] dump_stack+0xc2/0x16b [ 111.540890] print_address_description+0x6a/0x270 [ 111.542185] kasan_report+0x258/0x380 [ 111.544701] smb3_create_lease_buf+0x399/0x3b0 [cifs] [ 111.546134] SMB2_open+0x1ef8/0x4b70 [cifs] [ 111.575883] open_shroot+0x339/0x550 [cifs] [ 111.591969] smb3_qfs_tcon+0x32c/0x1e60 [cifs] [ 111.617405] cifs_mount+0x4f3/0x2fc0 [cifs] [ 111.674332] cifs_smb3_do_mount+0x263/0xf10 [cifs] [ 111.677915] mount_fs+0x55/0x2b0 [ 111.679504] vfs_kern_mount.part.22+0xaa/0x430 [ 111.684511] do_mount+0xc40/0x2660 [ 111.698301] ksys_mount+0x80/0xd0 [ 111.701541] do_syscall_64+0x14e/0x4b0 [ 111.711807] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.713665] RIP: 0033:0x7f372385b5fa [ 111.715311] Code: 48 8b 0d 99 78 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 66 78 2c 00 f7 d8 64 89 01 48 [ 111.720330] RSP: 002b:00007ffff27049d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 111.722601] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f372385b5fa [ 111.724842] RDX: 000055c2ecdc73b2 RSI: 000055c2ecdc73f9 RDI: 00007ffff270580f [ 111.727083] RBP: 00007ffff2705804 R08: 000055c2ee976060 R09: 0000000000001000 [ 111.729319] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f3723f4d000 [ 111.731615] R13: 000055c2ee976060 R14: 00007f3723f4f90f R15: 0000000000000000 [ 111.735448] The buggy address belongs to the page: [ 111.737420] page:ffffea000420a7c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 111.739890] flags: 0x17ffffc0000000() [ 111.741750] raw: 0017ffffc0000000 0000000000000000 dead000000000200 0000000000000000 [ 111.744216] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 111.746679] page dumped because: kasan: bad access detected [ 111.750482] Memory state around the buggy address: [ 111.752562] ffff88010829f100: 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 [ 111.754991] ffff88010829f180: 00 00 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 [ 111.757401] >ffff88010829f200: 00 00 00 00 00 f1 f1 f1 f1 01 f2 f2 f2 f2 f2 f2 [ 111.759801] ^ [ 111.762034] ffff88010829f280: f2 02 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 [ 111.764486] ffff88010829f300: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 111.766913] ================================================================== Lease keys are however already generated and stored in fid data on open and create paths: pass them down to the lease context creation handlers and use them. Suggested-by: Aurélien Aptel <aaptel@suse.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Fixes: b8c32dbb0deb ("CIFS: Request SMB2.1 leases") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-06-07cifs: fix a buffer leak in smb2_query_symlinkRonnie Sahlberg
This leak was introduced in 91cb74f5142c14dd921ab2d064b7b128054f9fae and caused us to leak one small buffer for every symlink query. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-01-26CIFS: use tcon_ipc instead of use_ipc parameter of SMB2_ioctlAurelien Aptel
Since IPC now has a tcon object, the caller can just pass it. This allows domain-based DFS requests to work with smb2+. Link: https://bugzilla.samba.org/show_bug.cgi?id=12917 Fixes: 9d49640a21bf ("CIFS: implement get_dfs_refer for SMB2+") Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2017-03-01CIFS: add use_ipc flag to SMB2_ioctl()Aurelien Aptel
when set, use the session IPC tree id instead of the tid in the provided tcon. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
2016-12-05CIFS: Fix a possible memory corruption in push locksPavel Shilovsky
If maxBuf is not 0 but less than a size of SMB2 lock structure we can end up with a memory corruption. Cc: Stable <stable@vger.kernel.org> Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
2015-11-03Add resilienthandles mount parmSteve French
Since many servers (Windows clients, and non-clustered servers) do not support persistent handles but do support resilient handles, allow the user to specify a mount option "resilienthandles" in order to get more reliable connections and less chance of data loss (at least when SMB2.1 or later). Default resilient handle timeout (120 seconds to recent Windows server) is used. Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <steve.french@primarydata.com>
2015-04-15VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells
that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-12-10fs/cifs/smb2file.c: replace count*size kzalloc by kcallocFabian Frederick
kcalloc manages count*sizeof overflow. Signed-off-by: Fabian Frederick <fabf@skynet.be> Cc: Steve French <sfrench@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-25CIFS: Fix wrong filename length for SMB2Pavel Shilovsky
The existing code uses the old MAX_NAME constant. This causes XFS test generic/013 to fail. Fix it by replacing MAX_NAME with PATH_MAX that SMB1 uses. Also remove an unused MAX_NAME constant definition. Cc: <stable@vger.kernel.org> # v3.7+ Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2013-09-09CIFS: Store lease state itself rather than a mapped oplock valuePavel Shilovsky
and separate smb20_operations struct. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2013-09-08CIFS: Replace clientCanCache* bools with an integerPavel Shilovsky
that prepare the code to handle different types of SMB2 leases. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2013-09-08CIFS: Implement follow_link for SMB2Pavel Shilovsky
that allows to access files through symlink created on a server. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
2013-07-10CIFS: Reconnect durable handles for SMB2Pavel Shilovsky
On reconnects, we need to reopen file and then obtain all byte-range locks held by the client. SMB2 protocol provides feature to make this process atomic by reconnecting to the same file handle with all it's byte-range locks. This patch adds this capability for SMB2 shares. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
2013-07-10CIFS: Make SMB2_open use cifs_open_parms structPavel Shilovsky
to prepare it for further durable handle reconnect processing. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
2013-07-10CIFS: Introduce cifs_open_parms structPavel Shilovsky
and pass it to the open() call. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
2013-07-10CIFS: Request durable open for SMB2 opensPavel Shilovsky
by passing durable context together with a handle caching lease or batch oplock. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
2013-07-10CIFS: Respect create_options in smb2_open_filePavel Shilovsky
and eliminated unused file_attribute parms of SMB2_open. Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
2013-05-04[CIFS] cifs: Rename cERROR and cFYI to cifs_dbgJoe Perches
It's not obvious from reading the macro names that these macros are for debugging. Convert the names to a single more typical kernel style cifs_dbg macro. cERROR(1, ...) -> cifs_dbg(VFS, ...) cFYI(1, ...) -> cifs_dbg(FYI, ...) cFYI(DBG2, ...) -> cifs_dbg(NOISY, ...) Move the terminating format newline from the macro to the call site. Add CONFIG_CIFS_DEBUG function cifs_vfs_err to emit the "CIFS VFS: " prefix for VFS messages. Size is reduced ~ 1% when CONFIG_CIFS_DEBUG is set (default y) $ size fs/cifs/cifs.ko* text data bss dec hex filename 265245 2525 132 267902 4167e fs/cifs/cifs.ko.new 268359 2525 132 271016 422a8 fs/cifs/cifs.ko.old Other miscellaneous changes around these conversions: o Miscellaneous typo fixes o Add terminating \n's to almost all formats and remove them from the macros to be more kernel style like. A few formats previously had defective \n's o Remove unnecessary OOM messages as kmalloc() calls dump_stack o Coalesce formats to make grep easier, added missing spaces when coalescing formats o Use %s, __func__ instead of embedded function name o Removed unnecessary "cifs: " prefixes o Convert kzalloc with multiply to kcalloc o Remove unused cifswarn macro Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-12-05CIFS: Separate pushing mandatory locks and lock_sem handlingPavel Shilovsky
Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24CIFS: Add SMB2.1 lease break supportPavel Shilovsky
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-09-24CIFS: Request SMB2.1 leasesPavel Shilovsky
if server supports them and we need oplocks. Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-09-24CIFS: Turn lock mutex into rw semaphorePavel Shilovsky
and allow several processes to walk through the lock list and read can_cache_brlcks value if they are not going to modify them. Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-09-24CIFS: Use brlock cache for SMB2Pavel Shilovsky
Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2012-09-24CIFS: Add brlock support for SMB2Pavel Shilovsky
Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
2012-09-24CIFS: Process oplocks for SMB2Pavel Shilovsky
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
2012-09-24CIFS: Add open/close file support for SMB2Pavel Shilovsky
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-15 08:12:29 +0000