* Re: [Bug 209919] New: kernel BUG at mm/usercopy.c:99 from stress-ng procfs
[not found] <bug-209919-27@https.bugzilla.kernel.org/>
@ 2020-10-28 23:36 ` Andrew Morton
2020-10-29 15:22 ` Jeffrey Bastian
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Morton @ 2020-10-28 23:36 UTC (permalink / raw)
To: jbastian; +Cc: bugzilla-daemon, linux-mm, Kees Cook, Al Viro
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Wed, 28 Oct 2020 15:49:15 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=209919
>
> Bug ID: 209919
> Summary: kernel BUG at mm/usercopy.c:99 from stress-ng procfs
> Product: Memory Management
> Version: 2.5
> Kernel Version: 5.10.0-rc1
> Hardware: All
> OS: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: Other
> Assignee: akpm@linux-foundation.org
> Reporter: jbastian@redhat.com
> Regression: No
>
> The procfs stressor from the stress-ng project triggers a kernel BUG in the
> 5.10.0-rc1 kernel on multiple architectures.
Thanks. A question from Kees, below...
> x86_64:
>
> [root@localhost stress-ng]# ./stress-ng --procfs 0 --timeout 60
> stress-ng: info: [3031466] dispatching hogs: 4 procfs
> [ 974.088011] ICMPv6: process `stress-ng-procf' is using deprecated sysctl
> (syscall) net.ipv6.neigh.enp0s29u1u1u5.retrans_time - use
> net.ipv6.neigh.enp0s29u1u1u5.retrans_time_ms instead
> [ 984.137351] usercopy: Kernel memory exposure attempt detected from SLUB
> object 'kmalloc-128' (offset 127, size 3)!
> [ 984.148917] ------------[ cut here ]------------
> [ 984.154089] kernel BUG at mm/usercopy.c:99!
> [ 984.158813] invalid opcode: 0000 [#1] SMP PTI
> [ 984.163771] CPU: 0 PID: 3031471 Comm: stress-ng-procf Tainted: G I
> 5.10.0-rc1 #1
> [ 984.173483] Hardware name: IBM IBM System X3250 M4 -[2583AC1]-/00D3729, BIOS
> -[JQE158AUS-1.05]- 07/23/2013
> [ 984.184260] RIP: 0010:usercopy_abort+0x74/0x76
> [ 984.189219] Code: 67 5c 8b 51 48 0f 45 d6 49 c7 c3 73 f7 5f 8b 4c 89 d1 57
> 48 c7 c6 68 57 5e 8b 48 c7 c7 38 f8 5f 8b 49 0f 45 f3 e8 13 71 ff ff <0f> 0b 4c
> 89 e1 49 89 d8 44 89 ea 31 f6 48 29 c1 48 c7 c7 b5 f7 5f
> [ 984.210177] RSP: 0018:ffff9c1f007b3dc0 EFLAGS: 00010286
> [ 984.216000] RAX: 0000000000000066 RBX: 0000000000000003 RCX:
> 0000000000000000
> [ 984.223965] RDX: ffff911f37c27e20 RSI: ffff911f37c19050 RDI:
> ffff911f37c19050
> [ 984.231929] RBP: ffff911e04cd1f82 R08: 0000000000000000 R09:
> 0000000000000000
> [ 984.239893] R10: ffff9c1f007b3bf8 R11: ffffffff8bd711a8 R12:
> ffff911e04cd1f7f
> [ 984.247857] R13: 0000000000000001 R14: 0000000000000003 R15:
> ffff911e009b19c0
> [ 984.255821] FS: 00007fbabb42b180(0000) GS:ffff911f37c00000(0000)
> knlGS:0000000000000000
> [ 984.264915] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 984.271520] CR2: 00007fbabb7ef000 CR3: 000000014e296001 CR4:
> 00000000001706f0
> [ 984.279683] Call Trace:
> [ 984.282581] __check_heap_object+0xe0/0x110
> [ 984.287405] __check_object_size+0x136/0x150
> [ 984.292347] proc_sys_call_handler+0x167/0x250
> [ 984.297565] new_sync_read+0x108/0x180
> [ 984.302082] vfs_read+0x174/0x1d0
> [ 984.306126] ksys_read+0x58/0xd0
> [ 984.310022] do_syscall_64+0x33/0x40
> [ 984.314277] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Can we determine which /proc/sys entries these are?
> [ 984.320201] RIP: 0033:0x7fbabb6099ac
> [ 984.324514] Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 89 fc
> ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00
> f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 bf fc ff ff 48
> [ 984.346368] RSP: 002b:00007fff47397340 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000000
> [ 984.355402] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
> 00007fbabb6099ac
> [ 984.363971] RDX: 0000000000000060 RSI: 00007fff47397390 RDI:
> 0000000000000006
> [ 984.372583] RBP: 0000000000000006 R08: 0000000000000000 R09:
> 0000000000000000
> [ 984.381093] R10: 00000000000fa2b4 R11: 0000000000000246 R12:
> 0000000000000003
> [ 984.389577] R13: 00007fff473a3630 R14: 0000000000001000 R15:
> 0000000000000060
> [ 984.398087] Modules linked in: binfmt_misc rfkill sunrpc intel_rapl_msr
> intel_rapl_common x86_pkg_temp_thermal mgag200 intel_powerclamp iTCO_wdt
> i2c_algo_bit coretemp intel_pmc_bxt cdc_ether gpio_ich drm_kms_helper
> iTCO_vendor_support usbnet mii cec rapl ipmi_ssif i2c_i801 intel_cstate e1000e
> intel_uncore ie31200_edac pcspkr ipmi_si i2c_smbus lpc_ich ipmi_devintf
> ipmi_msghandler drm ip_tables xfs crct10dif_pclmul crc32_pclmul crc32c_intel
> ghash_clmulni_intel ata_generic pata_acpi wmi
> [ 984.449316] ---[ end trace d44739bb135b1e63 ]---
> [ 984.455360] RIP: 0010:usercopy_abort+0x74/0x76
> [ 984.461181] Code: 67 5c 8b 51 48 0f 45 d6 49 c7 c3 73 f7 5f 8b 4c 89 d1 57
> 48 c7 c6 68 57 5e 8b 48 c7 c7 38 f8 5f 8b 49 0f 45 f3 e8 13 71 ff ff <0f> 0b 4c
> 89 e1 49 89 d8 44 89 ea 31 f6 48 29 c1 48 c7 c7 b5 f7 5f
> [ 984.483379] RSP: 0018:ffff9c1f007b3dc0 EFLAGS: 00010286
> [ 984.489416] RAX: 0000000000000066 RBX: 0000000000000003 RCX:
> 0000000000000000
> [ 984.497965] RDX: ffff911f37c27e20 RSI: ffff911f37c19050 RDI:
> ffff911f37c19050
> [ 984.507102] RBP: ffff911e04cd1f82 R08: 0000000000000000 R09:
> 0000000000000000
> [ 984.515588] R10: ffff9c1f007b3bf8 R11: ffffffff8bd711a8 R12:
> ffff911e04cd1f7f
> [ 984.524474] R13: 0000000000000001 R14: 0000000000000003 R15:
> ffff911e009b19c0
> [ 984.532878] FS: 00007fbabb42b180(0000) GS:ffff911f37c00000(0000)
> knlGS:0000000000000000
> [ 984.542084] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 984.548804] CR2: 00007fbabb7ef000 CR3: 000000014e296001 CR4:
> 00000000001706f0
>
>
> aarch64 (arm64):
>
> [root@localhost stress-ng]# ./stress-ng --procfs 0
> stress-ng: info: [44802] defaulting to a 86400 second (1 day, 0.00 secs) run
> per stressor
> stress-ng: info: [44802] dispatching hogs: 32 procfs
> stress-ng: info: [44802] cache allocate: using defaults, can't determine cache
> details from sysfs
> [ 2934.501319] usercopy: Kernel memory exposure attempt detected from SLUB
> object 'kmalloc-128' (offset 82, size 73)!
> [ 2934.516649] ------------[ cut here ]------------
> [ 2934.524448] kernel BUG at mm/usercopy.c:99!
> [ 2934.532208] Internal error: Oops - BUG: 0 [#1] SMP
> [ 2934.539950] Modules linked in: rfkill sunrpc nicvf cavium_ptp joydev nicpf
> cavium_rng_vf thunder_bgx thunder_xcv mdio_thunder cavium_rng mdio_cavium
> thunderx_edac ipmi_ssif ipmi_devintf ipmi_msghandler vfat fat ip_tables xfs ast
> i2c_algo_bit drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt
> fb_sys_fops cec drm_ttm_helper ttm crct10dif_ce drm ghash_ce gpio_keys
> i2c_thunderx thunderx_mmc aes_neon_bs
> [ 2934.540737] usercopy: Kernel memory exposure attempt detected from SLUB
> object 'kmalloc-128' (offset 55, size 108)!
> [ 2934.550255] usercopy: Kernel memory exposure attempt detected from SLUB
> object 'kmalloc-128' (offset 86, size 68)!
> [ 2934.550297] ------------[ cut here ]------------
> [ 2934.550300] kernel BUG at mm/usercopy.c:99!
> [ 2934.589488] CPU: 6 PID: 44874 Comm: stress-ng-procf Not tainted 5.10.0-rc1
> #1
> [ 2934.589492] Hardware name: GIGABYTE R120-T34-00/MT30-GS2-00, BIOS F02
> 08/06/2019
> [ 2934.589497] pstate: 40400005 (nZcv daif +PAN -UAO -TCO BTYPE=--)
> [ 2934.589507] pc : usercopy_abort+0x98/0x9c
> [ 2934.589511] lr : usercopy_abort+0x98/0x9c
> [ 2934.589518] sp : ffff80007e14bc70
> [ 2934.603274] ------------[ cut here ]------------
> [ 2934.616904] x29: ffff80007e14bc80 x28: ffff00013a6d2a80
> [ 2934.624799] kernel BUG at mm/usercopy.c:99!
> [ 2934.707971]
> [ 2934.707977] x27: 0000000000000000 x26: 0000000000000000
> [ 2934.721063] x25: ffff80007e14bd30 x24: 0000000000000000
> [ 2934.729652] x23: ffff000101e8a540 x22: ffff000149809a9b
> [ 2934.738181] x21: 0000000000000001 x20: 0000000000000049
> [ 2934.746646] x19: ffff000149809a52 x18: 0000000000000000
> [ 2934.755018] x17: 0000000000000000 x16: 0000000000000000
> [ 2934.763363] x15: 0000000000aaaaaa x14: 0000000000000020
> [ 2934.771682] x13: 00000000000117ca x12: ffff8000120bbe00
> [ 2934.780114] x11: 0000000000000003 x10: ffff80001208be18
> [ 2934.788496] x9 : ffff8000102310c0 x8 : ffff80001208bdc0
> [ 2934.796849] x7 : 0000000000000001 x6 : 0000000000000000
> [ 2934.804954] x5 : 0000000000000000 x4 : ffff000ff63af410
> [ 2934.813101] x3 : ffff000ff63be340 x2 : ffff000ff63af410
> [ 2934.821102] x1 : ffff00013a6d2a80 x0 : 0000000000000066
> [ 2934.829282] Call trace:
> [ 2934.834432] usercopy_abort+0x98/0x9c
> [ 2934.840907] __check_heap_object+0x124/0x138
> [ 2934.847889] __check_object_size+0x190/0x210
> [ 2934.854815] proc_sys_call_handler+0x154/0x220
> [ 2934.861877] proc_sys_read+0x1c/0x28
> [ 2934.868165] new_sync_read+0xdc/0x158
> [ 2934.874521] vfs_read+0x150/0x1e0
> [ 2934.880382] ksys_read+0x60/0xe8
> [ 2934.886226] __arm64_sys_read+0x24/0x30
> [ 2934.892799] el0_svc_common.constprop.0+0xac/0x1e0
> [ 2934.900356] do_el0_svc+0x2c/0x98
> [ 2934.906348] el0_sync_handler+0xb0/0xb8
> [ 2934.912797] el0_sync+0x178/0x180
> [ 2934.918675] Code: aa0003e3 f0002620 911f8000 97fff564 (d4210000)
> [ 2934.927269] ---[ end trace ed6d63c40907130f ]---
>
> --
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