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SubjectRe: [PATCH v2 00/39] x86: Kernel IBT
On Thu, Feb 24, 2022 at 03:51:38PM +0100, Peter Zijlstra wrote:
> Hi,
>
> This is an even more complete Kernel IBT implementation.
>
> Since last time (in no specific order):
>
> - Reworked Xen and paravirt bits lots (andyhpp)
> - Reworked entry annotation (jpoimboe)
> - Renamed CONFIG symbol to CONFIG_X86_KERNEL_IBT (redgecomb)
> - Pinned CR4_CET (kees)
> - Added __noendbr to CET control functions (kees)
> - kexec (redgecomb)
> - made function-graph, kprobes and bpf not explode (rostedt)
> - cleanups and split ups (jpoimboe, mbenes)
> - reworked whole module objtool (nathanchance)
> - attempted and failed at making Clang go
>
> Specifically to clang; I made clang-13 explode by rediscovering:
> https://reviews.llvm.org/D111108, then I tried clang-14 but it looks like
> ld.lld is still generating .plt entries out of thin air.
>
> Also, I know the very first patch is somewhat controversial amonst the clang
> people, but I really think the current state of affairs is abysmal and this
> lets me at least use clang.
>
> Patches are also available here:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt

Bricked my SPR:

[ 21.602888] jump_label: Fatal kernel bug, unexpected op at sched_clock_stable+0x4/0x20 [0000000074a0db20] (eb 06 b8 01 00 != eb 0a 00 00 00)) size:2 type:0
[ 21.618489] ------------[ cut here ]------------
[ 21.623706] kernel BUG at arch/x86/kernel/jump_label.c:73!
[ 21.629903] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[ 21.630897] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G I 5.17.0-rc5+ #3
[ 21.630897] Hardware name: Intel Corporation ArcherCity/ArcherCity, BIOS EGSDCRB1.86B.0064.D15.2109031959 09/03/2021
[ 21.630897] RIP: 0010:__jump_label_patch.cold.0+0x24/0x26
[ 21.630897] Code: 9f e9 9d b1 5f ff 48 c7 c3 a8 44 65 a0 41 55 45 89 f1 49 89 d8 4c 89 e1 4c 89 e2 4c 89 e6 48 c7 c7 78 00 77 9f e8 e8 a8 00 00 <0f> 0b 48 89 fb 48 c7 c6 f0 03 77 9f 48 8d bf d0 00 00 00 e8 41 16
[ 21.630897] RSP: 0000:ff7af25cc01cfd68 EFLAGS: 00010246
[ 21.630897] RAX: 000000000000008f RBX: ffffffffa06544a8 RCX: 0000000000000001
[ 21.630897] RDX: 0000000000000000 RSI: 00000000fffeffff RDI: 00000000ffffffff
[ 21.630897] RBP: ff7af25cc01cfd98 R08: 0000000000000000 R09: c0000000fffeffff
[ 21.630897] R10: 0000000000000001 R11: ff7af25cc01cfb88 R12: ffffffff9e520a74
[ 21.630897] R13: 0000000000000000 R14: 0000000000000002 R15: ffffffff9f7293b7
[ 21.630897] FS: 0000000000000000(0000) GS:ff422b3e2cc40000(0000) knlGS:0000000000000000
[ 21.630897] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.630897] CR2: 0000000000000000 CR3: 0000001994810001 CR4: 0000000000f71ee0
[ 21.630897] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 21.630897] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ 21.630897] PKRU: 55555554
[ 21.630897] Call Trace:
[ 21.630897] <TASK>
[ 21.630897] arch_jump_label_transform_queue+0x37/0x80
[ 21.630897] __jump_label_update+0x74/0x130
[ 21.630897] ? sched_init+0x556/0x556
[ 21.630897] ? rdinit_setup+0x30/0x30
[ 21.630897] static_key_enable_cpuslocked+0x5b/0x90
[ 21.630897] static_key_enable+0x1a/0x20
[ 21.630897] sched_clock_init_late+0x7a/0x95
[ 21.630897] do_one_initcall+0x45/0x200
[ 21.630897] kernel_init_freeable+0x211/0x27a
[ 21.630897] ? rest_init+0xd0/0xd0
[ 21.630897] kernel_init+0x1a/0x130
[ 21.630897] ret_from_fork+0x1f/0x30
[ 21.630897] </TASK>
[ 21.630897] Modules linked in:
[ 21.838238] ---[ end trace 0000000000000000 ]---


ffffffff81120a70 <sched_clock_stable>:
ffffffff81120a70: f3 0f 1e fa endbr64
ffffffff81120a74: eb 06 jmp ffffffff81120a7c <sched_clock_stable+0xc>
ffffffff81120a76: b8 01 00 00 00 mov $0x1,%eax
ffffffff81120a7b: c3 retq
ffffffff81120a7c: f3 0f 1e fa endbr64
ffffffff81120a80: 31 c0 xor %eax,%eax
ffffffff81120a82: c3 retq
ffffffff81120a83: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
ffffffff81120a8a: 00 00 00 00
ffffffff81120a8e: 66 90 xchg %ax,%ax

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