linux-kernel - Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI

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Date: Tue, 27 Feb 2024 13:30:28 +0000
From: Conor Dooley <conor.dooley@...rochip.com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
CC: Nathan Chancellor <nathan@...nel.org>, Conor Dooley <conor@...nel.org>,
	Matthew Maurer <mmaurer@...gle.com>, <linux-riscv@...ts.infradead.org>,
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson
 Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary
 Guo <gary@...yguo.net>, Björn Roy Baron
	<bjorn3_gh@...tonmail.com>, Jonathan Corbet <corbet@....net>, Paul Walmsley
	<paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Nick
 Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
	<rust-for-linux@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
	<stable@...r.kernel.org>, Sami Tolvanen <samitolvanen@...gle.com>, Ramon de C
 Valle <rcvalle@...gle.com>
Subject: Re: [PATCH v2 1/3] rust: make mutually exclusive with CFI_CLANG

On Tue, Feb 27, 2024 at 01:02:17PM +0000, Conor Dooley wrote:

> I'll give testing another try.

Yah, it is (as expected) broken on arm64 too:

 CFI failure at do_one_initcall+0xec/0x26c (target: __rust_minimal_init+0x0/0x64; expected type: 0x36b1c5a6)
 Internal error: Oops - CFI: 00000000f2008233 [#1] PREEMPT SMP
 Modules linked in:
 CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc3-00002-g724a75ac9542 #10
 Hardware name: linux,dummy-virt (DT)
 pstate: a0000005 (NzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : do_one_initcall+0xec/0x26c
 lr : do_initcall_level+0x8c/0xb0
 sp : ffff80008000bab0
 x29: ffff80008000bda0 x28: 0000000000000000 x27: 0000000000000000
 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
 x23: 0000000000000000 x22: 0000000000000000 x21: ffff18d941cb0000
 x20: ffffb8f6d6d9f000 x19: ffffb8f6d63e8b18 x18: 0000000000000002
 x17: 0000000036b1c5a6 x16: 00000000d65f03c0 x15: 0000000000000000
 x14: ffff18d9420280b1 x13: 0000000065dde380 x12: 0000000000000017
 x11: 0000000000000000 x10: 0000000000000000 x9 : d4db8c0058e7e300
 x8 : 0000000000000000 x7 : 0000000001f4c18b x6 : 0000000001f4c18b
 x5 : ffffb8f6d6d300a0 x4 : ffff80008000ba78 x3 : ffff18d942019860
 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffb8f6d63e8b18
 Call trace:
  do_one_initcall+0xec/0x26c
  do_initcall_level+0x8c/0xb0
  do_initcalls+0x54/0x94
  do_basic_setup+0x68/0x78
  kernel_init_freeable+0x100/0x16c
  kernel_init+0x20/0x1a0
  ret_from_fork+0x10/0x20
 Code: 7298b4d1 72a6d631 6b11021f 54000040 (d4304660) 
 ---[ end trace 0000000000000000 ]---
 note: swapper/0[1] exited with irqs disabled
 note: swapper/0[1] exited with preempt_count 1
 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
 Kernel Offset: 0x38f655800000 from 0xffff800080000000
 PHYS_OFFSET: 0xffffe72700000000
 CPU features: 0x0,88000203,3c020000,0100421b
 Memory Limit: none
 ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Cheers,
Conor.

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