Dave Hansen 1de14c3c5c x86-32: Fix possible incomplete TLB invalidate with PAE pagetables ... This patch attempts to fix: https://bugzilla.kernel.org/show_bug.cgi?id=56461 The symptom is a crash and messages like this: chrome: Corrupted page table at address 34a03000 *pdpt = 0000000000000000 *pde = 0000000000000000 Bad pagetable: 000f [#1] PREEMPT SMP Ingo guesses this got introduced by commit 611ae8e3f5 ("x86/tlb: enable tlb flush range support for x86") since that code started to free unused pagetables. On x86-32 PAE kernels, that new code has the potential to free an entire PMD page and will clear one of the four page-directory-pointer-table (aka pgd_t entries). The hardware aggressively "caches" these top-level entries and invlpg does not actually affect the CPU's copy. If we clear one we *HAVE* to do a full TLB flush, otherwise we might continue using a freed pmd page. (note, we do this properly on the population side in pud_populate()). This patch tracks whenever we clear one of these entries in the 'struct mmu_gather', and ensures that we follow up with a full tlb flush. BTW, I disassembled and checked that: if (tlb->fullmm == 0) and if (!tlb->fullmm && !tlb->need_flush_all) generate essentially the same code, so there should be zero impact there to the !PAE case. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Artem S Tashkinov <t.artem@mailcity.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-04-12 16:56:47 -07:00
..
boot	x86: Fix rebuild with EFI_STUB enabled	2013-04-05 13:59:23 -07:00
configs	x86: Default to ARCH=x86 to avoid overriding CONFIG_64BIT	2012-12-20 14:37:18 -08:00
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2013-02-25 15:56:15 -08:00
ia32	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2013-03-02 08:34:06 -08:00
include	x86-32: Fix possible incomplete TLB invalidate with PAE pagetables	2013-04-12 16:56:47 -07:00
kernel	Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-03-24 10:10:34 -07:00
kvm	KVM: Allow cross page reads and writes from cached translations.	2013-04-07 13:05:35 +03:00
lguest	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-21 18:06:55 -08:00
lib	x86-64: Fix the failure case in copy_user_handle_tail()	2013-03-18 11:32:03 -07:00
math-emu
mm	x86-32: Fix possible incomplete TLB invalidate with PAE pagetables	2013-04-12 16:56:47 -07:00
net	x86: bpf_jit_comp: add pkt_type support	2013-01-30 22:38:34 -05:00
oprofile	oprofile, x86: Fix wrapping bug in op_x86_get_ctrl()	2012-10-15 14:38:24 +02:00
pci	Bug-fixes:	2013-03-03 14:22:53 -08:00
platform	Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-27 16:17:42 -08:00
power	perf,x86: fix kernel crash with PEBS/BTS after suspend/resume	2013-03-15 09:26:35 -07:00
realmode	Merge remote-tracking branch 'origin/x86/mm' into x86/mm2	2013-02-01 02:28:36 -08:00
syscalls	fix compat truncate/ftruncate	2013-02-25 09:24:55 -05:00
tools	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-05 07:57:09 +11:00
um	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2013-02-23 18:50:11 -08:00
vdso	timers/x86/hpet: Use HPET_COUNTER to specify the hpet counter in vread_hpet()	2013-02-15 12:13:18 +01:00
video
xen	xen/mmu: On early bootup, flush the TLB when changing RO->RW bits Xen provided pagetables.	2013-04-02 14:02:23 -04:00
.gitignore
Kbuild
Kconfig	Select VIRT_TO_BUS directly where needed	2013-03-12 11:16:40 -07:00
Kconfig.cpu	x86, 386 removal: Document Nx586 as a 386 and thus unsupported	2012-11-29 13:28:39 -08:00
Kconfig.debug
Makefile	Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-19 19:12:03 -08:00
Makefile_32.cpu	x86, 386 removal: Remove CONFIG_M386 from Kconfig	2012-11-29 13:23:01 -08:00
Makefile.um