commit 82cd003a77173c91b9acad8033fb7931dac8d751 upstream. struct crush_bucket_tree::num_nodes is u8, so ceph_decode_8_safe() should be used. -Wconversion catches this, but I guess it went unnoticed in all the noise it spews. The actual problem (at least for common crushmaps) isn't the u32 -> u8 truncation though - it's the advancement by 4 bytes instead of 1 in the crushmap buffer. Fixes: http://tracker.ceph.com/issues/2759 Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Josh Durgin <jdurgin@redhat.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit 7eb71e0351fbb1b242ae70abb7bb17107fe2f792 upstream.
It turns out it's possible to get __remove_osd() called twice on the
same OSD. That doesn't sit well with rb_erase() - depending on the
shape of the tree we can get a NULL dereference, a soft lockup or
a random crash at some point in the future as we end up touching freed
memory. One scenario that I was able to reproduce is as follows:
<osd3 is idle, on the osd lru list>
<con reset - osd3>
con_fault_finish()
osd_reset()
<osdmap - osd3 down>
ceph_osdc_handle_map()
<takes map_sem>
kick_requests()
<takes request_mutex>
reset_changed_osds()
__reset_osd()
__remove_osd()
<releases request_mutex>
<releases map_sem>
<takes map_sem>
<takes request_mutex>
__kick_osd_requests()
__reset_osd()
__remove_osd() <-- !!!
A case can be made that osd refcounting is imperfect and reworking it
would be a proper resolution, but for now Sage and I decided to fix
this by adding a safe guard around __remove_osd().
Fixes: http://tracker.ceph.com/issues/8087
Cc: Sage Weil <sage@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Reviewed-by: Alex Elder <elder@linaro.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit aaef31703a0cf6a733e651885bfb49edc3ac6774 upstream. Large (greater than 32k, the value of PAGE_ALLOC_COSTLY_ORDER) auth tickets will have their buffers vmalloc'ed, which leads to the following crash in crypto: [ 28.685082] BUG: unable to handle kernel paging request at ffffeb04000032c0 [ 28.686032] IP: [<ffffffff81392b42>] scatterwalk_pagedone+0x22/0x80 [ 28.686032] PGD 0 [ 28.688088] Oops: 0000 [#1] PREEMPT SMP [ 28.688088] Modules linked in: [ 28.688088] CPU: 0 PID: 878 Comm: kworker/0:2 Not tainted 3.17.0-vm+ #305 [ 28.688088] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 [ 28.688088] Workqueue: ceph-msgr con_work [ 28.688088] task: ffff88011a7f9030 ti: ffff8800d903c000 task.ti: ffff8800d903c000 [ 28.688088] RIP: 0010:[<ffffffff81392b42>] [<ffffffff81392b42>] scatterwalk_pagedone+0x22/0x80 [ 28.688088] RSP: 0018:ffff8800d903f688 EFLAGS: 00010286 [ 28.688088] RAX: ffffeb04000032c0 RBX: ffff8800d903f718 RCX: ffffeb04000032c0 [ 28.688088] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8800d903f750 [ 28.688088] RBP: ffff8800d903f688 R08: 00000000000007de R09: ffff8800d903f880 [ 28.688088] R10: 18df467c72d6257b R11: 0000000000000000 R12: 0000000000000010 [ 28.688088] R13: ffff8800d903f750 R14: ffff8800d903f8a0 R15: 0000000000000000 [ 28.688088] FS: 00007f50a41c7700(0000) GS:ffff88011fc00000(0000) knlGS:0000000000000000 [ 28.688088] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 28.688088] CR2: ffffeb04000032c0 CR3: 00000000da3f3000 CR4: 00000000000006b0 [ 28.688088] Stack: [ 28.688088] ffff8800d903f698 ffffffff81392ca8 ffff8800d903f6e8 ffffffff81395d32 [ 28.688088] ffff8800dac96000 ffff880000000000 ffff8800d903f980 ffff880119b7e020 [ 28.688088] ffff880119b7e010 0000000000000000 0000000000000010 0000000000000010 [ 28.688088] Call Trace: [ 28.688088] [<ffffffff81392ca8>] scatterwalk_done+0x38/0x40 [ 28.688088] [<ffffffff81392ca8>] scatterwalk_done+0x38/0x40 [ 28.688088] [<ffffffff81395d32>] blkcipher_walk_done+0x182/0x220 [ 28.688088] [<ffffffff813990bf>] crypto_cbc_encrypt+0x15f/0x180 [ 28.688088] [<ffffffff81399780>] ? crypto_aes_set_key+0x30/0x30 [ 28.688088] [<ffffffff8156c40c>] ceph_aes_encrypt2+0x29c/0x2e0 [ 28.688088] [<ffffffff8156d2a3>] ceph_encrypt2+0x93/0xb0 [ 28.688088] [<ffffffff8156d7da>] ceph_x_encrypt+0x4a/0x60 [ 28.688088] [<ffffffff8155b39d>] ? ceph_buffer_new+0x5d/0xf0 [ 28.688088] [<ffffffff8156e837>] ceph_x_build_authorizer.isra.6+0x297/0x360 [ 28.688088] [<ffffffff8112089b>] ? kmem_cache_alloc_trace+0x11b/0x1c0 [ 28.688088] [<ffffffff8156b496>] ? ceph_auth_create_authorizer+0x36/0x80 [ 28.688088] [<ffffffff8156ed83>] ceph_x_create_authorizer+0x63/0xd0 [ 28.688088] [<ffffffff8156b4b4>] ceph_auth_create_authorizer+0x54/0x80 [ 28.688088] [<ffffffff8155f7c0>] get_authorizer+0x80/0xd0 [ 28.688088] [<ffffffff81555a8b>] prepare_write_connect+0x18b/0x2b0 [ 28.688088] [<ffffffff81559289>] try_read+0x1e59/0x1f10 This is because we set up crypto scatterlists as if all buffers were kmalloc'ed. Fix it. Signed-off-by: Ilya Dryomov <idryomov@redhat.com> Reviewed-by: Sage Weil <sage@redhat.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit f9865f06f7f18c6661c88d0511f05c48612319cc upstream.
Commit f363e45fd118 ("net/ceph: make ceph_msgr_wq non-reentrant")
effectively removed WQ_MEM_RECLAIM flag from ceph_msgr_wq. This is
wrong - libceph is very much a memory reclaim path, so restore it.
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
Tested-by: Micha Krause <micha@krausam.de>
Reviewed-by: Sage Weil <sage@redhat.com>
[bwh: Backported to 3.2:
- Keep passing the WQ_NON_REENTRANT flag too
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit c27a3e4d667fdcad3db7b104f75659478e0c68d8 upstream. We hard code cephx auth ticket buffer size to 256 bytes. This isn't enough for any moderate setups and, in case tickets themselves are not encrypted, leads to buffer overflows (ceph_x_decrypt() errors out, but ceph_decode_copy() doesn't - it's just a memcpy() wrapper). Since the buffer is allocated dynamically anyway, allocated it a bit later, at the point where we know how much is going to be needed. Fixes: http://tracker.ceph.com/issues/8979 Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@redhat.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit 597cda357716a3cf8d994cb11927af917c8d71fa upstream. Add a helper for processing individual cephx auth tickets. Needed for the next commit, which deals with allocating ticket buffers. (Most of the diff here is whitespace - view with git diff -b). Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@redhat.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit 73c3d4812b4c755efeca0140f606f83772a39ce4 upstream. We preallocate a few of the message types we get back from the mon. If we get a larger message than we are expecting, fall back to trying to allocate a new one instead of blindly using the one we have. Signed-off-by: Sage Weil <sage@redhat.com> Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit 3cea4c3071d4e55e9d7356efe9d0ebf92f0c2204 upstream. Rename front_max field of struct ceph_msg to front_alloc_len to make its purpose more clear. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit 178eda29ca721842f2146378e73d43e0044c4166 upstream. It has been reported that using ZFSonLinux on rbd will result in memory corruption. The bug report can be found here: https://github.com/zfsonlinux/spl/issues/241 http://tracker.ceph.com/issues/7790 The reason is that ZFS will send pages with page_count 0 into rbd, which in turns send them to tcp_sendpage. However, tcp_sendpage cannot deal with page_count 0, as it will do get_page and put_page, and erroneously free the page. This type of issue has been noted before, and handled in iscsi, drbd, etc. So, rbd should also handle this. This fix address this issue by fall back to slower sendmsg when page_count 0 detected. Cc: Sage Weil <sage@inktank.com> Cc: Yehuda Sadeh <yehuda@inktank.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
commit e36b13cceb46136d849aeee06b4907ad3570ba78 upstream.
Make ceph_tcp_sendpage() be the only place kernel_sendpage() is
used, by using this helper in write_partial_msg_pages().
Signed-off-by: Alex Elder <elder@dreamhost.com>
Reviewed-by: Sage Weil <sage@newdream.net>
[bwh: Backported to 3.2:
- Add ceph_tcp_sendpage(), from commit 31739139f3ed ('libceph: use
kernel_sendpage() for sending zeroes'), the rest of which is not
applicable
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>