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Message-ID: <20131115045357.27580.92965.stgit@kbuild-fedora.novalocal>
Date: Fri, 15 Nov 2013 04:53:57 +0000
From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-arch@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
x86@...nel.org, lkml <linux-kernel@...r.kernel.org>,
"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
virtualization@...ts.linux-foundation.org,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Seiji Aguchi <seiji.aguchi@....com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH -tip RFC v2 14/22] x86/fault: Use NOKPROBE_SYMBOL macro in
fault.c
Use NOKPROBE_SYMBOL macro to protect functions from kprobes
instead of __kprobes annotation in fault.c.
This applies __always_inline annotation for some cases,
because NOKPROBE_SYMBOL() will inhibit inlining by
referring the symbol address.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Seiji Aguchi <seiji.aguchi@....com>
---
arch/x86/mm/fault.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9ff85bb..7c9305c 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -8,7 +8,7 @@
#include <linux/kdebug.h> /* oops_begin/end, ... */
#include <linux/module.h> /* search_exception_table */
#include <linux/bootmem.h> /* max_low_pfn */
-#include <linux/kprobes.h> /* __kprobes, ... */
+#include <linux/kprobes.h> /* NOKPROBE_SYMBOL, ... */
#include <linux/mmiotrace.h> /* kmmio_handler, ... */
#include <linux/perf_event.h> /* perf_sw_event */
#include <linux/hugetlb.h> /* hstate_index_to_shift */
@@ -45,7 +45,7 @@ enum x86_pf_error_code {
* Returns 0 if mmiotrace is disabled, or if the fault is not
* handled by mmiotrace:
*/
-static inline int __kprobes
+static __always_inline int
kmmio_fault(struct pt_regs *regs, unsigned long addr)
{
if (unlikely(is_kmmio_active()))
@@ -54,7 +54,7 @@ kmmio_fault(struct pt_regs *regs, unsigned long addr)
return 0;
}
-static inline int __kprobes kprobes_fault(struct pt_regs *regs)
+static __always_inline int kprobes_fault(struct pt_regs *regs)
{
int ret = 0;
@@ -261,7 +261,7 @@ void vmalloc_sync_all(void)
*
* Handle a fault on the vmalloc or module mapping area
*/
-static noinline __kprobes int vmalloc_fault(unsigned long address)
+static noinline int vmalloc_fault(unsigned long address)
{
unsigned long pgd_paddr;
pmd_t *pmd_k;
@@ -291,6 +291,7 @@ static noinline __kprobes int vmalloc_fault(unsigned long address)
return 0;
}
+NOKPROBE_SYMBOL(vmalloc_fault);
/*
* Did it hit the DOS screen memory VA from vm86 mode?
@@ -358,7 +359,7 @@ void vmalloc_sync_all(void)
*
* This assumes no large pages in there.
*/
-static noinline __kprobes int vmalloc_fault(unsigned long address)
+static noinline int vmalloc_fault(unsigned long address)
{
pgd_t *pgd, *pgd_ref;
pud_t *pud, *pud_ref;
@@ -425,6 +426,7 @@ static noinline __kprobes int vmalloc_fault(unsigned long address)
return 0;
}
+NOKPROBE_SYMBOL(vmalloc_fault);
#ifdef CONFIG_CPU_SUP_AMD
static const char errata93_warning[] =
@@ -904,7 +906,7 @@ static int spurious_fault_check(unsigned long error_code, pte_t *pte)
* There are no security implications to leaving a stale TLB when
* increasing the permissions on a page.
*/
-static noinline __kprobes int
+static noinline int
spurious_fault(unsigned long error_code, unsigned long address)
{
pgd_t *pgd;
@@ -952,6 +954,7 @@ spurious_fault(unsigned long error_code, unsigned long address)
return ret;
}
+NOKPROBE_SYMBOL(spurious_fault);
int show_unhandled_signals = 1;
@@ -997,7 +1000,7 @@ static inline bool smap_violation(int error_code, struct pt_regs *regs)
* and the problem, and then passes it off to one of the appropriate
* routines.
*/
-static void __kprobes
+static void
__do_page_fault(struct pt_regs *regs, unsigned long error_code)
{
struct vm_area_struct *vma;
@@ -1225,8 +1228,9 @@ good_area:
up_read(&mm->mmap_sem);
}
+NOKPROBE_SYMBOL(__do_page_fault);
-dotraplinkage void __kprobes
+dotraplinkage void
do_page_fault(struct pt_regs *regs, unsigned long error_code)
{
enum ctx_state prev_state;
@@ -1235,9 +1239,10 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
__do_page_fault(regs, error_code);
exception_exit(prev_state);
}
+NOKPROBE_SYMBOL(do_page_fault);
-static void trace_page_fault_entries(struct pt_regs *regs,
- unsigned long error_code)
+static __always_inline void
+trace_page_fault_entries(struct pt_regs *regs, unsigned long error_code)
{
if (user_mode(regs))
trace_page_fault_user(read_cr2(), regs, error_code);
@@ -1245,7 +1250,7 @@ static void trace_page_fault_entries(struct pt_regs *regs,
trace_page_fault_kernel(read_cr2(), regs, error_code);
}
-dotraplinkage void __kprobes
+dotraplinkage void
trace_do_page_fault(struct pt_regs *regs, unsigned long error_code)
{
enum ctx_state prev_state;
@@ -1255,3 +1260,4 @@ trace_do_page_fault(struct pt_regs *regs, unsigned long error_code)
__do_page_fault(regs, error_code);
exception_exit(prev_state);
}
+NOKPROBE_SYMBOL(trace_do_page_fault);
--
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