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kprobes/x86: Fix to add __kprobes to in-kernel fault handing functions

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Add __kprobes to the functions which handle in-kernel fixable page
faults. Since kprobes can cause those in-kernel page faults by accessing
kprobe data structures, probing those fault functions will cause
fault-int3-loop (do_page_fault has already been marked as __kprobes).

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20090827172311.8246.92725.stgit@localhost.localdomain>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Masami Hiramatsu 2009-08-27 13:23:11 -04:00 committed by Frederic Weisbecker
parent f5ad31158d
commit 62c9295f9d
1 changed files with 6 additions and 5 deletions
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11
arch/x86/mm/fault.c
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@ -38,7 +38,8 @@ enum x86_pf_error_code {
* Returns 0 if mmiotrace is disabled, or if the fault is not * Returns 0 if mmiotrace is disabled, or if the fault is not
* handled by mmiotrace: * handled by mmiotrace:
*/ */
static inline int kmmio_fault(struct pt_regs *regs, unsigned long addr) static inline int __kprobes
kmmio_fault(struct pt_regs *regs, unsigned long addr)
{ {
if (unlikely(is_kmmio_active())) if (unlikely(is_kmmio_active()))
if (kmmio_handler(regs, addr) == 1) if (kmmio_handler(regs, addr) == 1)
@ -46,7 +47,7 @@ static inline int kmmio_fault(struct pt_regs *regs, unsigned long addr)
return 0; return 0;
} }
static inline int notify_page_fault(struct pt_regs *regs) static inline int __kprobes notify_page_fault(struct pt_regs *regs)
{ {
int ret = 0; int ret = 0;
@ -239,7 +240,7 @@ void vmalloc_sync_all(void)
* *
* Handle a fault on the vmalloc or module mapping area * Handle a fault on the vmalloc or module mapping area
*/ */
static noinline int vmalloc_fault(unsigned long address) static noinline __kprobes int vmalloc_fault(unsigned long address)
{ {
unsigned long pgd_paddr; unsigned long pgd_paddr;
pmd_t *pmd_k; pmd_t *pmd_k;
@ -361,7 +362,7 @@ void vmalloc_sync_all(void)
* *
* This assumes no large pages in there. * This assumes no large pages in there.
*/ */
static noinline int vmalloc_fault(unsigned long address) static noinline __kprobes int vmalloc_fault(unsigned long address)
{ {
pgd_t *pgd, *pgd_ref; pgd_t *pgd, *pgd_ref;
pud_t *pud, *pud_ref; pud_t *pud, *pud_ref;
@ -858,7 +859,7 @@ static int spurious_fault_check(unsigned long error_code, pte_t *pte)
* There are no security implications to leaving a stale TLB when * There are no security implications to leaving a stale TLB when
* increasing the permissions on a page. * increasing the permissions on a page.
*/ */
static noinline int static noinline __kprobes int
spurious_fault(unsigned long error_code, unsigned long address) spurious_fault(unsigned long error_code, unsigned long address)
{ {
pgd_t *pgd; pgd_t *pgd;