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SubjectRe: [PATCH v1] binfmt_misc: fix crash when load/unload module
On Tue, Jan 25, 2022 at 9:23 PM Tong Zhang <ztong0001@gmail.com> wrote:
>
> On Tue, Jan 25, 2022 at 9:04 PM Murphy Zhou <jencce.kernel@gmail.com> wrote:
> >
> > Still panic with this patch on Linux-next tree:
> >
> > [ 1128.275515] LTP: starting binfmt_misc02 (binfmt_misc02.sh)
> > [ 1128.303975] CPU: 1 PID: 107182 Comm: modprobe Kdump: loaded
> > Tainted: G W 5.17.0-rc1-next-20220125+ #1
> > [ 1128.305264] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
> > [ 1128.305992] Call Trace:
> > [ 1128.306376] <TASK>
> > [ 1128.306682] dump_stack_lvl+0x34/0x44
> > [ 1128.307211] __register_sysctl_table+0x2c7/0x4a0
> > [ 1128.307846] ? load_module+0xb37/0xbb0
> > [ 1128.308339] ? 0xffffffffc01b6000
> > [ 1128.308762] init_misc_binfmt+0x32/0x1000 [binfmt_misc]
> > [ 1128.309402] do_one_initcall+0x44/0x200
> > [ 1128.309937] ? kmem_cache_alloc_trace+0x163/0x2c0
> > [ 1128.310535] do_init_module+0x5c/0x260
> > [ 1128.311045] __do_sys_finit_module+0xb4/0x120
> > [ 1128.311603] do_syscall_64+0x3b/0x90
> > [ 1128.312088] entry_SYSCALL_64_after_hwframe+0x44/0xae
> > [ 1128.312755] RIP: 0033:0x7f929ab85fbd
> >
> > Testing patch on Linus tree.
>
> Hi Murphy,
> Did you apply this patch?
> Link: https://lkml.kernel.org/r/20220124181812.1869535-2-ztong0001@gmail.com
> I tested it on top of the current master branch and it works on my
> setup using the reproducer I mentioned.
> Could you share your test script?
> Thanks,
> - Tong

I can find binfmt_misc02.sh on github, and running the following
command shows: failed 0.

./runltp -s binfmt_misc
Running tests.......
<<<test_start>>>
tag=binfmt_misc01 stime=1643178454
cmdline="binfmt_misc01.sh"
contacts=""
analysis=exit
<<<test_output>>>
[ 90.908282] LTP: starting binfmt_misc01 (binfmt_misc01.sh)
binfmt_misc01 1 TINFO: timeout per run is 0h 5m 0s
binfmt_misc01 1 TPASS: Failed to register a binary type
binfmt_misc01 2 TPASS: Failed to register a binary type
binfmt_misc01 3 TPASS: Failed to register a binary type
binfmt_misc01 4 TPASS: Failed to register a binary type
binfmt_misc01 5 TPASS: Failed to register a binary type
binfmt_misc01 6 TPASS: Failed to register a binary type
binfmt_misc01 7 TPASS: Failed to register a binary type
binfmt_misc01 8 TPASS: Failed to register a binary type
binfmt_misc01 9 TPASS: Failed to register a binary type

Summary:
passed 9
failed 0
broken 0
skipped 0
warnings 0
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=0 corefile=no
cutime=2 cstime=17
<<<test_end>>>
<<<test_start>>>
tag=binfmt_misc02 stime=1643178454
cmdline="binfmt_misc02.sh"
contacts=""
analysis=exit
<<<test_output>>>
[ 91.133399] LTP: starting binfmt_misc02 (binfmt_misc02.sh)
incrementing stop
binfmt_misc02 1 TINFO: timeout per run is 0h 5m 0s
binfmt_misc02 1 TPASS: Recognise and unrecognise a binary type as expected
binfmt_misc02 2 TPASS: Recognise and unrecognise a binary type as expected
binfmt_misc02 3 TPASS: Recognise and unrecognise a binary type as expected
binfmt_misc02 4 TPASS: Recognise and unrecognise a binary type as expected
binfmt_misc02 5 TPASS: Fail to recognise a binary type
binfmt_misc02 6 TPASS: Fail to recognise a binary type

Summary:
passed 6
failed 0
broken 0
skipped 0
warnings 0
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=0 corefile=no
cutime=3 cstime=25
<<<test_end>>>
INFO: ltp-pan reported all tests PASS
LTP Version: 20220121-9-g010e4f783

###############################################################

Done executing testcases.
LTP Version: 20220121-9-g010e4f783
###############################################################

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