[next] x86: BUG: kernel NULL pointer dereference, address:
From: Naresh Kamboju
Date: Fri Apr 29 2022 - 07:50:49 EST
Following kernel BUG noticed on Linux next-20220428 on x86_64 while running
selftests x86 fsgsbase_64 test cases.
Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
Test log:
----------
# selftests: x86: fsgsbase_64
# [OK] GSBASE started at 1
# [RUN] Set GS = 0x7, read GSBASE
# [OK] GSBASE reads as 0x1 with invalid GS
# FSGSBASE instructions are enabled
# [RUN] ARCH_SET_GS to 0x0
# [OK] GSBASE was set as expected (selector 0x0)
# [OK] ARCH_GET_GS worked as expected (selector 0x0)
# [RUN] ARCH_SET_GS to 0x1
# [OK] GSBASE was set as expected (selector 0x0)
# [OK] ARCH_GET_GS worked as exp[ 199.295202] BUG: kernel NULL
pointer dereference, address: 0000000000000000
[ 199.302779] #PF: supervisor read access in kernel mode
[ 199.307918] #PF: error_code(0x0000) - not-present page
[ 199.313057] PGD 8000000145f05067 P4D 8000000145f05067 PUD 145f04067 PMD 0
[ 199.319930] Oops: 0000 [#1] PREEMPT SMP PTI
[ 199.324117] CPU: 1 PID: 2948 Comm: sysret_rip_64 Tainted: G
K 5.18.0-rc4-next-20220428 #1
[ 199.333587] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 199.340972] RIP: 0010:copy_vma+0x61/0x220
[ 199.344983] Code: 48 89 45 d0 31 c0 49 8b 07 49 83 7f 60 00 48 89
45 b8 0f 84 47 01 00 00 48 8d 55 c8 4c 89 ee 4c 89 f7 4c 01 eb e8 2f
ec ff ff <48> 39 18 72 7e 4d 8b 47 20 4d 8b 4f 58 6a 00 48 89 d9 41 ff
b7 90
[ 199.363722] RSP: 0018:ffffacf8813bfca0 EFLAGS: 00010292
[ 199.368946] RAX: 0000000000000000 RBX: 00007fffffffe000 RCX: 0000000000000001
[ 199.376070] RDX: ffffffffffffffff RSI: ffff9c6d04959f00 RDI: ffffacf8813bfc38
[ 199.383193] RBP: ffffacf8813bfcf0 R08: 000000000000000b R09: 000000000000000b
[ 199.390317] R10: ffff9c6d03e392f0 R11: 0000000000000058 R12: ffffacf8813bfd48
[ 199.397441] R13: 00007fffffffd000 R14: ffff9c6ccc331d40 R15: ffff9c6d03e392f0
[ 199.404566] FS: 00007fce67a16b80(0000) GS:ffff9c6e2fa80000(0000)
knlGS:0000000000000000
[ 199.412644] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 199.418391] CR2: 0000000000000000 CR3: 0000000156398002 CR4: 00000000003706e0
[ 199.425521] DR0: 00000000006021a8 DR1: 0000000000400ae9 DR2: 0000000000000000
[ 199.432647] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 199.439778] Call Trace:
[ 199.442221] <TASK>
[ 199.444320] move_vma+0x131/0x4a0
[ 199.447644] __do_sys_mremap+0x35c/0x890
[ 199.451578] ? syscall_trace_enter.constprop.0+0x176/0x230
[ 199.457068] __x64_sys_mremap+0x25/0x30
[ 199.460907] do_syscall_64+0x5c/0x80
[ 199.464486] ? do_syscall_64+0x69/0x80
[ 199.468239] ? syscall_exit_to_user_mode+0x3a/0x50
[ 199.473031] ? do_syscall_64+0x69/0x80
[ 199.476786] ? asm_exc_general_protection+0x8/0x30
[ 199.481576] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 199.486631] RIP: 0033:0x7fce66f10bda
[ 199.490208] Code: 73 01 c3 48 8b 0d be a2 2b 00 f7 d8 64 89 01 48
83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 19 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 8e a2 2b 00 f7 d8 64 89
01 48
[ 199.508952] RSP: 002b:00007ffd71e44b28 EFLAGS: 00000206 ORIG_RAX:
0000000000000019
[ 199.516511] RAX: ffffffffffffffda RBX: 00007fffffffd000 RCX: 00007fce66f10bda
[ 199.523634] RDX: 0000000000001000 RSI: 0000000000001000 RDI: 0000000000402000
[ 199.530757] RBP: 0000000000000001 R08: 00007fffffffd000 R09: 00007ffd71e449fc
[ 199.537883] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000001
[ 199.545016] R13: 00007ffd71e44ce0 R14: 0000000000000000 R15: 0000000000000000
[ 199.552150] </TASK>
[ 199.554341] Modules linked in: x86_pkg_temp_thermal fuse [last
unloaded: test_klp_livepatch]
[ 199.562772] CR2: 0000000000000000
ected (selector [ 199.566084] ---[ end trace 0000000000000000 ]---
[ 199.566085] RIP: 0010:copy_vma+0x61/0x220
0x0)
# [RUN] AR[ 199.566088] Code: 48 89 45 d0 31 c0 49 8b 07 49 83 7f 60
00 48 89 45 b8 0f 84 47 01 00 00 48 8d 55 c8 4c 89 ee 4c 89 f7 4c 01
eb e8 2f ec ff ff <48> 39 18 72 7e 4d 8b 47 20 4d 8b 4f 58 6a 00 48 89
d9 41 ff b7 90
[ 199.566089] RSP: 0018:ffffacf8813bfca0 EFLAGS: 00010292
CH_SET_GS to 0x2[ 199.566090] RAX: 0000000000000000 RBX:
00007fffffffe000 RCX: 0000000000000001
[ 199.566091] RDX: ffffffffffffffff RSI: ffff9c6d04959f00 RDI: ffffacf8813bfc38
00000000
# [OK][ 199.566092] RBP: ffffacf8813bfcf0 R08: 000000000000000b R09:
000000000000000b
GSBASE was set [ 199.566092] R10: ffff9c6d03e392f0 R11:
0000000000000058 R12: ffffacf8813bfd48
[ 199.566093] R13: 00007fffffffd000 R14: ffff9c6ccc331d40 R15: ffff9c6d03e392f0
as expected (sel[ 199.566094] FS: 00007fce67a16b80(0000)
GS:ffff9c6e2fa80000(0000) knlGS:0000000000000000
[ 199.566095] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
ector 0x0)
# [O[ 199.566096] CR2: 0000000000000000 CR3: 0000000156398002 CR4:
00000000003706e0
[ 199.566097] DR0: 00000000006021a8 DR1: 0000000000400ae9 DR2: 0000000000000000
K] ARCH_GET_GS w[ 199.566098] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000600
orked as expected (selector 0x0)
# [RUN] ARCH_SET_GS to 0x0
# [OK] GSBASE was set as expected (selector 0x0)
# [OK] ARCH_GET_GS worked as expected (selector 0x0)
metadata:
git_ref: master
git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
git_sha: bdc61aad77faf67187525028f1f355eff3849f22
git_describe: next-20220428
kernel_version: 5.18.0-rc4
kernel-config: https://builds.tuxbuild.com/28Pz4BMeY7pEp28bl5hC46lwjpe/config
vmlinux : https://builds.tuxbuild.com/28Pz4BMeY7pEp28bl5hC46lwjpe/vmlinux.xz
System.map : https://builds.tuxbuild.com/28Pz4BMeY7pEp28bl5hC46lwjpe/System.map
Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
--
Linaro LKFT
https://lkft.linaro.org