Hi Christoph, thank you very much for your work in this LP! Both the
debug part and finally your patch. I was looking the same set of issues
in parallel, with another user that reported the same crashes.
So, regarding your question in comment #15 ("are those gonna be
backportet to 4.x-generic?"), I've just nominated this LP for all series
with kernels 4.15+, given we had no reports for previous series. That
said, we're going to backport your patch as soon some more validation
tests are finished. I'm planning to use this LP only for the strcat
issue.
There's another LP for the smb2_push_mandatory_locks() crash:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795659
I suggest you to add yourself in that bug, so we can follow-up the
discussion there regarding this 2nd crash. There's a candidate patch for
the smb2_push_mandatory_locks() issue, you already mentioned it here:
b98749cac4a ("CIFS: keep FileInfo handle live during oplock break").
It's unfortunate that you said testing v5.1-rc7 didn't fix that crash -
I've discussed this smb2_push_mandatory_locks() crash with Steve and
Pavel (from Microsoft) in a private thread and they suggested me exactly
this patch in order to fix the issue.
Could you test the kernel
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2-rc1/ (which includes your
strcat patch) and see if it still reproduces the smb2_push_mandatory_locks()
crash?
Would be really helpful for us. You can comment the testing in the other LP (#
1795659), if possible.
Cheers,
Guilherme
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1824981
Title:
cifs set_oplock buffer overflow in strcat
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Status in linux source package in Disco:
In Progress
Status in linux source package in Eoan:
Fix Committed
Bug description:
Ubuntu 18.04.2 LTS
Linux SRV013 4.15.0-47-generic #50-Ubuntu SMP Wed Mar 13 10:44:52 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
DELL R740, 2 CPU (40 Cores, 80 Threads), 384 GiB RAM
top - 12:39:53 up 3:41, 4 users, load average: 66.19, 64.06, 76.90
Tasks: 1076 total, 1 running, 675 sleeping, 12 stopped, 1 zombie
%Cpu(s): 28.2 us, 0.3 sy, 0.0 ni, 71.5 id, 0.0 wa, 0.0 hi, 0.1 si, 0.0
st
KiB Mem : 39483801+total, 24077185+free, 57428284 used, 96637872 buff/cache
KiB Swap: 999420 total, 999420 free, 0 used. 33477683+avail Mem
We've seen the following bug many times since we introduced new
machines running Ubuntu 18. Wasn't an issue older machines running
Ubuntu 16. Three different machines are affected, so it's rather not a
hardware issue.
| detected buffer overflow in strcat
| ------------[ cut here ]------------
| kernel BUG at /build/linux-6ZmFRN/linux-4.15.0/lib/string.c:1052!
| invalid opcode: 0000 [#1] SMP PTI
| Modules linked in: [...]
| Hardware name: Dell Inc. PowerEdge R740/0923K0, BIOS 1.6.11 11/20/2018
| RIP: 0010:fortify_panic+0x13/0x22
| [...]
| Call Trace:
| smb21_set_oplock_level+0x147/0x1a0 [cifs]
| smb3_set_oplock_level+0x22/0x90 [cifs]
| smb2_set_fid+0x76/0xb0 [cifs]
| cifs_new_fileinfo+0x259/0x390 [cifs]
| ? smb2_get_lease_key+0x40/0x40 [cifs]
| ? cifs_new_fileinfo+0x259/0x390 [cifs]
| cifs_open+0x3db/0x8d0 [cifs]
| [...]
(Full dmesg output attached)
After hitting this bug there are many cifs related dmesg entries,
processes lock up and eventually the systems freezes.
The share is mounted using:
//server/share /mnt/server/ cifs
defaults,auto,iocharset=utf8,noperm,file_mode=0777,dir_mode=0777,credentials=/root/passwords/share,domain=myDomain,uid=myUser,gid=10513,mfsymlinks
Currently we're testing the cifs mount options "cache=none" as the bug
seems to be oplock related.
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