Imre Deak 1d2127123d ARM: 5742/1: ARM: add debug check for invalid kernel page faults ... According to the following in arch/arm/mm/fault.c page faults from kernel mode are invalid if mmap_sem is already held and there is no exception handler defined for the faulting instruction: /* * As per x86, we may deadlock here. However, since the kernel only * validly references user space from well defined areas of the code, * we can bug out early if this is from code which shouldn't. */ if (!down_read_trylock(&mm->mmap_sem)) { if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc)) goto no_context; Since mmap_sem can be held at arbitrary times by another thread this also means that any page faults from kernel mode are invalid if no exception handler is defined for them, regardless whether mmap_sem is held at the time of fault. To easier detect code that can trigger the above error, add a check also for the case where mmap_sem is acquired. As this has an overhead make it a VM debug check. Signed-off-by: Imre Deak <imre.deak@nokia.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		2009-10-05 17:55:55 +01:00
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S	Add core support for ARMv6/v7 big-endian	2009-05-30 14:00:18 +01:00
abort-ev7.S
abort-lv4t.S
abort-macro.S
abort-nommu.S
alignment.c	Thumb-2: Implement the unified arch/arm/mm support	2009-07-24 12:32:56 +01:00
cache-fa.S
cache-feroceon-l2.c
cache-l2x0.c
cache-v3.S
cache-v4.S
cache-v4wb.S
cache-v4wt.S
cache-v6.S
cache-v7.S	Thumb-2: Implement the unified arch/arm/mm support	2009-07-24 12:32:56 +01:00
cache-xsc3l2.c
context.c	cpumask: use mm_cpumask() wrapper: arm	2009-09-24 09:34:49 +09:30
copypage-fa.c
copypage-feroceon.c
copypage-v3.c
copypage-v4mc.c
copypage-v4wb.c
copypage-v4wt.c
copypage-v6.c
copypage-xsc3.c
copypage-xscale.c
discontig.c
dma-mapping.c	nommu: Add noMMU support to the DMA API	2009-07-24 12:35:02 +01:00
extable.c
fault-armv.c
fault.c	ARM: 5742/1: ARM: add debug check for invalid kernel page faults	2009-10-05 17:55:55 +01:00
fault.h
flush.c	cpumask: use mm_cpumask() wrapper: arm	2009-09-24 09:34:49 +09:30
highmem.c	ARM: 5691/1: fix cache aliasing issues between kmap() and kmap_atomic() with highmem	2009-09-04 19:20:07 +01:00
init.c	Merge branch 'origin' into for-linus	2009-09-24 21:22:33 +01:00
iomap.c
ioremap.c
Kconfig	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
Makefile	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
mm.h
mmap.c	ARM: 5740/1: fix valid_phys_addr_range() range check	2009-10-02 22:32:34 +01:00
mmu.c	ARM: Don't allow highmem on SMP platforms without h/w TLB ops broadcast	2009-09-28 18:06:20 +01:00
nommu.c	nommu: Include asm/setup.h in arch/arm/mm/nommu.c	2009-07-24 12:35:03 +01:00
pabort-legacy.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
pabort-v6.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
pabort-v7.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
pgd.c
proc-arm6_7.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm7tdmi.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm9tdmi.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm720.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm740.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm920.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm922.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm925.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm926.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm940.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm946.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm1020.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm1020e.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm1022.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-arm1026.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-fa526.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-feroceon.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-macros.S	Merge branch 'devel-stable' into devel	2009-09-12 12:02:26 +01:00
proc-mohawk.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-sa110.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-sa1100.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-syms.c	[ARM] export __cpu_flush_dcache_page	2009-07-05 15:25:00 +01:00
proc-v6.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-v7.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-xsc3.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
proc-xscale.S	ARM: 5727/1: Pass IFSR register to do_PrefetchAbort()	2009-10-02 22:34:32 +01:00
tlb-fa.S
tlb-v3.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S
tlb-v7.S	Check whether the TLB operations need broadcasting on SMP systems	2009-05-30 14:00:14 +01:00