Messages in this thread | | | Date | Mon, 10 Jul 2023 08:57:03 -0700 | From | Nathan Chancellor <> | Subject | Re: [RFC PATCH 0/2] x86: kprobes: Fix CFI_CLANG related issues |
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On Mon, Jul 10, 2023 at 09:14:13PM +0900, Masami Hiramatsu (Google) wrote: > I just build tested, since I could not boot the kernel with CFI_CLANG=y. > Would anyone know something about this error? > > [ 0.141030] MMIO Stale Data: Unknown: No mitigations > [ 0.153511] SMP alternatives: Using kCFI > [ 0.164593] Freeing SMP alternatives memory: 36K > [ 0.165053] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_kernel+0x472/0x48b > [ 0.166028] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.2-00002-g12b1b2fca8ef #126 > [ 0.166028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 > [ 0.166028] Call Trace: > [ 0.166028] <TASK> > [ 0.166028] dump_stack_lvl+0x6e/0xb0 > [ 0.166028] panic+0x146/0x2f0 > [ 0.166028] ? start_kernel+0x472/0x48b > [ 0.166028] __stack_chk_fail+0x14/0x20 > [ 0.166028] start_kernel+0x472/0x48b > [ 0.166028] x86_64_start_reservations+0x24/0x30 > [ 0.166028] x86_64_start_kernel+0xa6/0xbb > [ 0.166028] secondary_startup_64_no_verify+0x106/0x11b > [ 0.166028] </TASK> > [ 0.166028] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: start_kernel+0x472/0x48b ]---
This looks like https://github.com/ClangBuiltLinux/linux/issues/1815 to me. What version of LLVM are you using? This was fixed in 16.0.4. Commit 514ca14ed544 ("start_kernel: Add __no_stack_protector function attribute") should resolve it on the Linux side, it looks like that is in 6.5-rc1. Not sure if we should backport it or just let people upgrade their toolchains on older releases.
Cheers, Nathan
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