https://lists.ubuntu.com/archives/kernel-team/2021-May/120236.html
Sent fix to mailing list.
** Description changed:
- io_uring02 from ubuntu_ltp_syscalls fails on F/oem-5.6 5.6.0-1056.60 on
- host spitfire
+ [Impact]
+ When using async io_uring OP_SENDMSG, a copy to kernel address 0 might be
attempted, leading to a kernel WARN/BUG and an uninterruptible process.
+
+ [Fix]
+ Partial backport of dd821e0c95a64b5923a0c57f07d3f7563553e756 ("io_uring: fix
missing msg_name assignment"). The recvmsg side does not seed to set msg_name,
as it copies from a local/stack kernel address (at ____sys_recvmsg) to a uaddr
parameter, which is given when doing the copy_msghdr operation.
+
+ [Test case]
+ LTP io_uring02 was run, and an equivalent recvmsg test was done too. A
successfull sendmsg test (without the chroot at io_uring02 test) was also
tested.
+
+ [Potential regressions]
+ io_uring sendmsg/recvmsg paths could fail, potentially leading to a system
crash or even a security vulnerability.
+
+
+ -----------------------------------------------------------------------
+
+
+ io_uring02 from ubuntu_ltp_syscalls fails on F/oem-5.6 5.6.0-1056.60 on host
spitfire
This test isn't found to be ran on previous versions on F/oem-5.6, so
would not consider this to be a regression.
-
26934. 05/07 14:42:48 DEBUG| utils:0153| [stdout] tag=io_uring01
stime=1620398217 dur=0 exit=exited stat=0 core=no cu=0 cs=0
26935. 05/07 14:42:48 DEBUG| utils:0153| [stdout] startup='Fri May 7
14:36:57 2021'
26936. 05/07 14:42:48 DEBUG| utils:0153| [stdout] tst_test.c:1311:
TINFO: Timeout per run is 0h 05m 00s
26937. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26938. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26939. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26940. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26941. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26942. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26943. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26944. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26945. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26946. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26947. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Test timeouted,
sending SIGKILL!
26948. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Cannot kill test
processes!
26949. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Congratulation,
likely test hit a kernel bug.
26950. 05/07 14:42:48 DEBUG| utils:0153| [stdout] Exitting uncleanly...
26951. 05/07 14:42:48 DEBUG| utils:0153| [stdout] tag=io_uring02
stime=1620398217 dur=350 exit=exited stat=1 core=no cu=0 cs=0
--
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https://bugs.launchpad.net/bugs/1928028
Title:
io_uring02 from ubuntu_ltp_syscalls fails on F/oem-5.6 (timeouted /
SIGKILL)
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