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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9fe6299dde
When the kernel.print-fatal-signals sysctl has been enabled, a simple
userspace crash will cause the kernel to write a crash dump that contains,
among other things, the kernel gsbase into dmesg.
As suggested by Andy, limit output to pt_regs, FS_BASE and KERNEL_GS_BASE
in this case.
This also moves the bitness-specific logic from show_regs() into
process_{32,64}.c.
Fixes: 45807a1df9 ("vdso: print fatal signals")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180831194151.123586-1-jannh@google.com
44 lines
964 B
C
44 lines
964 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_KDEBUG_H
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#define _ASM_X86_KDEBUG_H
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#include <linux/notifier.h>
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struct pt_regs;
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/* Grossly misnamed. */
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enum die_val {
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DIE_OOPS = 1,
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DIE_INT3,
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DIE_DEBUG,
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DIE_PANIC,
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DIE_NMI,
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DIE_DIE,
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DIE_KERNELDEBUG,
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DIE_TRAP,
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DIE_GPF,
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DIE_CALL,
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DIE_PAGE_FAULT,
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DIE_NMIUNKNOWN,
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};
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enum show_regs_mode {
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SHOW_REGS_SHORT,
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/*
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* For when userspace crashed, but we don't think it's our fault, and
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* therefore don't print kernel registers.
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*/
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SHOW_REGS_USER,
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SHOW_REGS_ALL
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};
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extern void die(const char *, struct pt_regs *,long);
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extern int __must_check __die(const char *, struct pt_regs *, long);
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extern void show_stack_regs(struct pt_regs *regs);
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extern void __show_regs(struct pt_regs *regs, enum show_regs_mode);
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extern void show_iret_regs(struct pt_regs *regs);
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extern unsigned long oops_begin(void);
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extern void oops_end(unsigned long, struct pt_regs *, int signr);
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#endif /* _ASM_X86_KDEBUG_H */
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