diff options
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/fault.c | 18 | ||||
| -rw-r--r-- | arch/x86/mm/init.c | 2 | ||||
| -rw-r--r-- | arch/x86/mm/init_32.c | 2 |
3 files changed, 17 insertions, 5 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index c6acc632637..baa0e86adfb 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -14,6 +14,7 @@ #include <asm/traps.h> /* dotraplinkage, ... */ #include <asm/pgalloc.h> /* pgd_*(), ... */ +#include <asm/kmemcheck.h> /* kmemcheck_*(), ... */ /* * Page fault error code bits: @@ -956,6 +957,13 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code) /* Get the faulting address: */ address = read_cr2(); + /* + * Detect and handle instructions that would cause a page fault for + * both a tracked kernel page and a userspace page. + */ + if (kmemcheck_active(regs)) + kmemcheck_hide(regs); + if (unlikely(kmmio_fault(regs, address))) return; @@ -973,9 +981,13 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code) * protection error (error_code & 9) == 0. */ if (unlikely(fault_in_kernel_space(address))) { - if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) && - vmalloc_fault(address) >= 0) - return; + if (!(error_code & (PF_RSVD | PF_USER | PF_PROT))) { + if (vmalloc_fault(address) >= 0) + return; + + if (kmemcheck_fault(regs, address, error_code)) + return; + } /* Can handle a stale RO->RW TLB: */ if (spurious_fault(error_code, address)) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 34c1bfb64f1..f53b57e4086 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -213,7 +213,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, if (!after_bootmem) init_gbpages(); -#ifdef CONFIG_DEBUG_PAGEALLOC +#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) /* * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. * This will simplify cpa(), which otherwise needs to support splitting diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 949708d7a48..80cafd76a2b 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -111,7 +111,7 @@ static pte_t * __init one_page_table_init(pmd_t *pmd) pte_t *page_table = NULL; if (after_bootmem) { -#ifdef CONFIG_DEBUG_PAGEALLOC +#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); #endif if (!page_table) |