39a26d8721
commit 0e25498f8cd43c1b5aa327f373dd094e9a006da7 upstream. There are two big uses of do_exit. The first is it's design use to be the guts of the exit(2) system call. The second use is to terminate a task after something catastrophic has happened like a NULL pointer in kernel code. Add a function make_task_dead that is initialy exactly the same as do_exit to cover the cases where do_exit is called to handle catastrophic failure. In time this can probably be reduced to just a light wrapper around do_task_dead. For now keep it exactly the same so that there will be no behavioral differences introducing this new concept. Replace all of the uses of do_exit that use it for catastraphic task cleanup with make_task_dead to make it clear what the code is doing. As part of this rename rewind_stack_do_exit rewind_stack_and_make_dead. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/h8300/mm/fault.c
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
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* Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
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*
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* Based on:
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*
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* linux/arch/m68knommu/mm/fault.c
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* linux/arch/m68k/mm/fault.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*/
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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void die(const char *str, struct pt_regs *fp, unsigned long err);
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/*
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* This routine handles page faults. It determines the problem, and
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* then passes it off to one of the appropriate routines.
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*
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* error_code:
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* bit 0 == 0 means no page found, 1 means protection fault
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* bit 1 == 0 means read, 1 means write
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*
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* If this routine detects a bad access, it returns 1, otherwise it
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* returns 0.
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*/
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asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
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unsigned long error_code)
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{
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#ifdef DEBUG
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pr_debug("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n",
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regs->sr, regs->pc, address, error_code);
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#endif
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/*
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* Oops. The kernel tried to access some bad page. We'll have to
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* terminate things with extreme prejudice.
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*/
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if ((unsigned long) address < PAGE_SIZE)
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pr_alert("Unable to handle kernel NULL pointer dereference");
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else
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pr_alert("Unable to handle kernel access");
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printk(" at virtual address %08lx\n", address);
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if (!user_mode(regs))
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die("Oops", regs, error_code);
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make_dead_task(SIGKILL);
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return 1;
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}
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