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Date: Wed, 26 Jun 2024 15:53:14 -0400 From: "Valdis Klētnieks" <valdis.kletnieks@...edu> To: linux-kernel@...r.kernel.org Subject: next-20240613 system crash in usercopy during ia32 emulation Been a while since I've managed to repeatably crash a linux-next kernel... Setup: I found myself needing to build an i686 RPM on a Fedora system. So I followed the docs, installed mock and tried to run it.. mock -r /etc/mock/fedora-rawhide-i386.cfg /path/to/srpm And it dies while trying to populate the chroot environment with RPMs, before it even looks at the srpm. Have triggered it twice, haven't dug in to see if it dies at the same RPM, or in more detail what it's doing besides "installing an i686 rpm". % zgrep -i ia32 /proc/config.gz CONFIG_IA32_FEAT_CTL=y CONFIG_IA32_EMULATION=y CONFIG_IA32_EMULATION_DEFAULT_DISABLED=y but /proc/cmdline does contain ia32_emulation=1. Any ideas? What got left in pstore: [ 863.309804][ T4890] usercopy: Kernel memory overwrite attempt detected to SLUB object 'task_struct' (offset 10880, size 160)! [ 863.391576][ T4890] ------------[ cut here ]------------ [ 863.471844][ T4890] kernel BUG at mm/usercopy.c:102! [ 863.552181][ T4890] Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI [ 863.632443][ T4890] CPU: 1 PID: 4890 Comm: sh Tainted: G I T 6.10.0-rc3-next-20240613 #80 ddf22571ffa7b333da0a09c88396e47266906b78 [ 863.712707][ T4890] Tainted: [I]=FIRMWARE_WORKAROUND, [T]=RANDSTRUCT [ 863.792967][ T4890] Hardware name: Dell Inc. Inspiron 5559/052K07, BIOS 1.9.0 09/07/2020 [ 863.873227][ T4890] RIP: 0010:usercopy_abort+0x77/0x79 [ 863.953494][ T4890] Code: 04 5d 00 90 eb 0e 48 c7 c2 25 9b 02 90 48 c7 c7 18 bc ff 8f 56 48 89 fe 48 c7 c7 f8 44 0a 90 51 48 89 c1 41 52 e8 19 6f ff ff <0f> 0b 48 89 d9 48 2b 08 41 0f b6 d5 4d 89 e0 31 f6 48 c7 c7 2d 3f [ 864.033756][ T4890] RSP: 0000:ffff95380525fbe8 EFLAGS: 00010246 [ 864.114016][ T4890] [ 864.194277][ T4890] RAX: 0000000000000069 RBX: ffff8fdd8214d8c0 RCX: 0000000000000000 [ 864.274542][ T4890] RDX: 0000000000000000 RSI: ffffffff8fffa9a5 RDI: 00000000ffffffff [ 864.354809][ T4890] RBP: ffff95380525fc00 R08: 0000000000000000 R09: ffff95380525fa48 [ 864.435074][ T4890] R10: ffffffff90b7e028 R11: 0000000000000003 R12: 00000000000000a0 [ 864.515370][ T4890] R13: 0000000000000000 R14: ffff8fdd8214d960 R15: ffff8fdd8214d8c0 [ 864.595632][ T4890] FS: 0000000000000000(0003) GS:ffff8fe072400000(0063) knlGS:00000000f7f8c900 [ 864.675897][ T4890] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 864.756163][ T4890] CR2: 00007fed02b68000 CR3: 0000000196fd0003 CR4: 00000000003706f0 [ 864.836442][ T4890] Call Trace: [ 864.916728][ T4890] <TASK> [ 864.996994][ T4890] ? show_trace_log_lvl+0x1ff/0x2d0 [ 865.077303][ T4890] ? show_trace_log_lvl+0x1ff/0x2d0 [ 865.157570][ T4890] ? __check_heap_object+0x82/0xa0 [ 865.237837][ T4890] ? show_regs.part.0+0x1d/0x23 [ 865.318109][ T4890] ? __die_body.cold+0x8/0xd [ 865.398383][ T4890] ? __die+0x29/0x40 [ 865.478652][ T4890] ? die+0x2e/0x50 [ 865.558919][ T4890] ? do_trap+0xb7/0x100 [ 865.639188][ T4890] ? do_error_trap+0x75/0x110 [ 865.719518][ T4890] ? usercopy_abort+0x77/0x79 [ 865.799792][ T4890] ? exc_invalid_op+0x56/0x70 [ 865.880055][ T4890] ? usercopy_abort+0x77/0x79 [ 865.960342][ T4890] ? asm_exc_invalid_op+0x1f/0x30 [ 866.040645][ T4890] ? usercopy_abort+0x77/0x79 [ 866.120907][ T4890] ? usercopy_abort+0x77/0x79 [ 866.201167][ T4890] __check_heap_object+0x82/0xa0 [ 866.281490][ T4890] check_heap_object+0x141/0x160 [ 866.361757][ T4890] __check_object_size.part.0+0x5d/0xc0 [ 866.442022][ T4890] __check_object_size+0x1d/0x30 [ 866.522299][ T4890] copy_from_buffer+0x45/0x70 [ 866.602638][ T4890] copy_uabi_to_xstate+0x12e/0x230 [ 866.682907][ T4890] copy_sigframe_from_user_to_xstate+0x20/0x30 [ 866.763183][ T4890] __fpu_restore_sig+0x303/0x320 [ 866.843508][ T4890] fpu__restore_sig+0x50/0x90 [ 866.923798][ T4890] ia32_restore_sigcontext+0x11c/0x150 [ 867.004069][ T4890] __do_compat_sys_sigreturn+0x8d/0xd0 [ 867.084343][ T4890] ia32_sys_call+0x1a9b/0x23f0 [ 867.164608][ T4890] do_int80_emulation+0x91/0x120 [ 867.244874][ T4890] asm_int80_emulation+0x1f/0x30 [ 867.325161][ T4890] RIP: 0023:0xf7f91579 [ 867.405501][ T4890] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 [ 867.485772][ T4890] RSP: 002b:00000000ffd5d840 EFLAGS: 00000286 [ 867.646290][ T4890] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000ffd5d944 [ 867.726585][ T4890] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000583a9e30 [ 867.806846][ T4890] RBP: 00000000ffd5d8e8 R08: 0000000000000000 R09: 0000000000000000 [ 867.887127][ T4890] R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000000 [ 867.967386][ T4890] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 868.047696][ T4890] </TASK> [ 868.127955][ T4890] Modules linked in: snd_hrtimer ts_bm nft_limit algif_hash algif_skcipher xt_string af_alg xt_LOG nf_log_syslog nft_compat bnep nf_tables sunrpc amdgpu amdxcp drm_exec gpu_sched binfmt_misc btusb btrtl btintel btbcm intel_rapl_msr rtsx_usb dell_smm_hwmon intel_rapl_common x86_pkg_temp_thermal intel_powerclamp crct10dif_pclmul radeon crc32_pclmul crc32c_intel polyval_clmulni polyval_generic ghash_clmulni_intel bluetooth cryptd sha512_ssse3 sha256_ssse3 sha1_ssse3 drm_ttm_helper drm_suballoc_helper intel_pch_thermal fan vfat fat tpm_crb uas joydev serio_raw bfq fuse dmi_sysfs [ 895.745791][ T4890] ---[ end trace 0000000000000000 ]--- [ 910.594045][ T4890] RIP: 0010:usercopy_abort+0x77/0x79 [ 910.694667][ T4890] Code: 04 5d 00 90 eb 0e 48 c7 c2 25 9b 02 90 48 c7 c7 18 bc ff 8f 56 48 89 fe 48 c7 c7 f8 44 0a 90 51 48 89 c1 41 52 e8 19 6f ff ff <0f> 0b 48 89 d9 48 2b 08 41 0f b6 d5 4d 89 e0 31 f6 48 c7 c7 2d 3f [ 910.774952][ T4890] RSP: 0000:ffff95380525fbe8 EFLAGS: 00010246 [ 910.855542][ T4890] [ 910.935811][ T4890] RAX: 0000000000000069 RBX: ffff8fdd8214d8c0 RCX: 0000000000000000 [ 911.016089][ T4890] RDX: 0000000000000000 RSI: ffffffff8fffa9a5 RDI: 00000000ffffffff [ 911.096357][ T4890] RBP: ffff95380525fc00 R08: 0000000000000000 R09: ffff95380525fa48 [ 911.176624][ T4890] R10: ffffffff90b7e028 R11: 0000000000000003 R12: 00000000000000a0 [ 911.256892][ T4890] R13: 0000000000000000 R14: ffff8fdd8214d960 R15: ffff8fdd8214d8c0 [ 911.337181][ T4890] FS: 0000000000000000(0003) GS:ffff8fe072800000(0063) knlGS:00000000f7f8c900 [ 911.417466][ T4890] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 911.497743][ T4890] CR2: 00007feedd108640 CR3: 0000000196fd0006 CR4: 00000000003706f0 [ 911.578040][ T4890] Kernel panic - not syncing: Fatal exception [ 911.658351][ T4890] Kernel Offset: 0xd000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
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