abd4f7505b
This patch makes the i386 behave the same way that x86_64 does when a
segfault happens. A line gets printed to the kernel log so that tools
that need to check for failures can behave more uniformly between
debug.show_unhandled_signals sysctl variable to 0 (or by doing echo 0 >
/proc/sys/debug/exception-trace)
Also, all of the lines being printed are now using printk_ratelimit() to
deny the ability of DoS from a local user with a program like the
following:
main()
{
while (1)
if (!fork()) *(int *)0 = 0;
}
This new revision also includes the fix that Andrew did which got rid of
new sysctl that was added to the system in earlier versions of this.
Also, 'show-unhandled-signals' sysctl has been renamed back to the old
'exception-trace' to avoid breakage of people's scripts.
AK: Enabling by default for i386 will be likely controversal, but let's see what happens
AK: Really folks, before complaining just fix your segfaults
AK: I bet this will find a lot of silent issues
Signed-off-by: Masoud Sharbiani <masouds@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
[ Personally, I've found the complaints useful on x86-64, so I'm all for
this. That said, I wonder if we could do it more prettily.. -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
#ifndef _ASM_X8664_PROTO_H
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#define _ASM_X8664_PROTO_H 1
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#include <asm/ldt.h>
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/* misc architecture specific prototypes */
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struct cpuinfo_x86;
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struct pt_regs;
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extern void start_kernel(void);
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extern void pda_init(int);
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extern void early_idt_handler(void);
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extern void mcheck_init(struct cpuinfo_x86 *c);
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extern void init_memory_mapping(unsigned long start, unsigned long end);
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extern void system_call(void);
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extern int kernel_syscall(void);
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extern void syscall_init(void);
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extern void ia32_syscall(void);
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extern void ia32_cstar_target(void);
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extern void ia32_sysenter_target(void);
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extern void config_acpi_tables(void);
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extern void ia32_syscall(void);
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extern int pmtimer_mark_offset(void);
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extern void pmtimer_resume(void);
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extern void pmtimer_wait(unsigned);
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extern unsigned int do_gettimeoffset_pm(void);
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#ifdef CONFIG_X86_PM_TIMER
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extern u32 pmtmr_ioport;
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#else
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#define pmtmr_ioport 0
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#endif
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extern int nohpet;
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extern void early_printk(const char *fmt, ...) __attribute__((format(printf,1,2)));
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extern void early_identify_cpu(struct cpuinfo_x86 *c);
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extern int k8_scan_nodes(unsigned long start, unsigned long end);
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extern void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
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extern unsigned long numa_free_all_bootmem(void);
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extern void reserve_bootmem_generic(unsigned long phys, unsigned len);
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extern void load_gs_index(unsigned gs);
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extern void stop_timer_interrupt(void);
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extern void main_timer_handler(void);
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extern unsigned long end_pfn_map;
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extern void show_trace(struct task_struct *, struct pt_regs *, unsigned long * rsp);
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extern void show_registers(struct pt_regs *regs);
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extern void exception_table_check(void);
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extern void acpi_reserve_bootmem(void);
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extern void swap_low_mappings(void);
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extern void __show_regs(struct pt_regs * regs);
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extern void show_regs(struct pt_regs * regs);
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extern void syscall32_cpu_init(void);
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extern void setup_node_bootmem(int nodeid, unsigned long start, unsigned long end);
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extern void early_quirks(void);
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extern void check_efer(void);
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extern void select_idle_routine(const struct cpuinfo_x86 *c);
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extern unsigned long table_start, table_end;
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extern int exception_trace;
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extern unsigned cpu_khz;
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extern unsigned tsc_khz;
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extern int reboot_force;
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extern int notsc_setup(char *);
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extern int timer_over_8254;
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extern int gsi_irq_sharing(int gsi);
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extern void smp_local_timer_interrupt(void);
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extern int force_mwait;
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long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);
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void i8254_timer_resume(void);
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#define round_up(x,y) (((x) + (y) - 1) & ~((y)-1))
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#define round_down(x,y) ((x) & ~((y)-1))
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#endif
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