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Date: Fri, 19 Feb 2016 05:45:59 -0800
From: "Luis R. Rodriguez" <mcgrof@...nel.org>
To: hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, luto@...capital.net,
boris.ostrovsky@...cle.com, rusty@...tcorp.com.au,
david.vrabel@...rix.com, konrad.wilk@...cle.com, mcb30@...e.org,
jgross@...e.com, ming.lei@...onical.com,
gregkh@...uxfoundation.org, arnd@...db.de,
linux-arch@...r.kernel.org, linux@....linux.org.uk,
benh@...nel.crashing.org, jbaron@...mai.com, ananth@...ibm.com,
anil.s.keshavamurthy@...el.com, davem@...emloft.net,
masami.hiramatsu.pt@...achi.com, andriy.shevchenko@...ux.intel.com,
dwmw2@...radead.org, xen-devel@...ts.xensource.com,
"Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [RFC v2 7/7] kprobes: port to linker table
kprobe makes use of two custom sections:
type name begin end
init.data _kprobe_blacklist __start_kprobe_blacklist __stop_kprobe_blacklist
text .kprobes.text __kprobes_text_start __kprobes_text_end
Port these to the linker table generic solution. This lets
us remove all the custom kprobe section declarations on the
linker script.
Tested with CONFIG_KPROBES_SANITY_TEST, it passes with:
Kprobe smoke test: started
Kprobe smoke test: passed successfully
Then tested CONFIG_SAMPLE_KPROBES on do_fork, and the
kprobe bites and kicks as expected. Lastly tried registering
a kprobe on a kprobe blacklisted symbol (NOKPROBE_SYMBOL()),
and confirms that fails to work.
Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
arch/arc/kernel/vmlinux.lds.S | 1 -
arch/arm/kernel/entry-armv.S | 2 +-
arch/arm/kernel/vmlinux.lds.S | 1 -
arch/avr32/kernel/entry-avr32b.S | 4 ++--
arch/avr32/kernel/vmlinux.lds.S | 1 -
arch/blackfin/kernel/vmlinux.lds.S | 1 -
arch/c6x/kernel/vmlinux.lds.S | 1 -
arch/hexagon/kernel/vmlinux.lds.S | 1 -
arch/ia64/kernel/jprobes.S | 2 +-
arch/ia64/kernel/vmlinux.lds.S | 1 -
arch/ia64/lib/flush.S | 4 ++--
arch/metag/kernel/vmlinux.lds.S | 1 -
arch/microblaze/kernel/vmlinux.lds.S | 1 -
arch/mips/kernel/vmlinux.lds.S | 1 -
arch/mn10300/kernel/vmlinux.lds.S | 1 -
arch/nios2/kernel/vmlinux.lds.S | 1 -
arch/openrisc/kernel/vmlinux.lds.S | 1 -
arch/parisc/kernel/vmlinux.lds.S | 1 -
arch/powerpc/include/asm/ppc_asm.h | 6 +++---
arch/powerpc/kernel/vmlinux.lds.S | 1 -
arch/s390/kernel/entry.S | 4 ++--
arch/s390/kernel/kprobes.c | 2 +-
arch/s390/kernel/mcount.S | 2 +-
arch/s390/kernel/vmlinux.lds.S | 1 -
arch/score/kernel/vmlinux.lds.S | 1 -
arch/sh/kernel/vmlinux.lds.S | 1 -
arch/sparc/kernel/vmlinux.lds.S | 1 -
arch/sparc/mm/ultra.S | 2 +-
arch/tile/kernel/vmlinux.lds.S | 1 -
arch/x86/kernel/kprobes/core.c | 10 ++++++----
arch/x86/kernel/vmlinux.lds.S | 1 -
include/asm-generic/sections.h | 4 ++--
include/asm-generic/vmlinux.lds.h | 16 ----------------
include/linux/compiler.h | 3 ++-
include/linux/kprobes.h | 7 +++++--
kernel/kprobes.c | 16 +++++++---------
scripts/mod/modpost.c | 3 ++-
scripts/recordmcount.c | 3 ++-
scripts/recordmcount.pl | 2 +-
39 files changed, 41 insertions(+), 72 deletions(-)
diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
index 894e696bddaa..52f23df2b9b6 100644
--- a/arch/arc/kernel/vmlinux.lds.S
+++ b/arch/arc/kernel/vmlinux.lds.S
@@ -98,7 +98,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.fixup)
*(.gnu.warning)
}
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 3ce377f7251f..4959a83833fd 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -83,7 +83,7 @@
.endm
#ifdef CONFIG_KPROBES
- .section .kprobes.text,"ax",%progbits
+ .section .text.tbl.kprobes.all,"ax",%progbits
#else
.text
#endif
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 8b60fde5ce48..8de7921ac331 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -108,7 +108,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.gnu.warning)
*(.glue_7)
*(.glue_7t)
diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 7301f4806bbe..c0fe699d0a21 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/arch/avr32/kernel/entry-avr32b.S
@@ -605,7 +605,7 @@ fault_exit_work:
brcc fault_resume_user
rjmp enter_monitor_mode
- .section .kprobes.text, "ax", @progbits
+ .section .text.tbl.kprobes.all, "ax", @progbits
.type handle_debug, @function
handle_debug:
sub sp, 4 /* r12_orig */
@@ -826,7 +826,7 @@ irq_level\level:
IRQ_LEVEL 2
IRQ_LEVEL 3
- .section .kprobes.text, "ax", @progbits
+ .section .text.tbl.kprobes.all, "ax", @progbits
.type enter_monitor_mode, @function
enter_monitor_mode:
/*
diff --git a/arch/avr32/kernel/vmlinux.lds.S b/arch/avr32/kernel/vmlinux.lds.S
index a4589176bed5..bf4f3f1f9dbb 100644
--- a/arch/avr32/kernel/vmlinux.lds.S
+++ b/arch/avr32/kernel/vmlinux.lds.S
@@ -49,7 +49,6 @@ SECTIONS
_stext = .;
*(.ex.text)
*(.irq.text)
- KPROBES_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
diff --git a/arch/blackfin/kernel/vmlinux.lds.S b/arch/blackfin/kernel/vmlinux.lds.S
index c9eec84aa258..8a193fad4c5d 100644
--- a/arch/blackfin/kernel/vmlinux.lds.S
+++ b/arch/blackfin/kernel/vmlinux.lds.S
@@ -35,7 +35,6 @@ SECTIONS
#endif
LOCK_TEXT
IRQENTRY_TEXT
- KPROBES_TEXT
#ifdef CONFIG_ROMKERNEL
__sinittext = .;
INIT_TEXT
diff --git a/arch/c6x/kernel/vmlinux.lds.S b/arch/c6x/kernel/vmlinux.lds.S
index 5a6e141d1641..a23bed62cec3 100644
--- a/arch/c6x/kernel/vmlinux.lds.S
+++ b/arch/c6x/kernel/vmlinux.lds.S
@@ -72,7 +72,6 @@ SECTIONS
SCHED_TEXT
LOCK_TEXT
IRQENTRY_TEXT
- KPROBES_TEXT
*(.fixup)
*(.gnu.warning)
}
diff --git a/arch/hexagon/kernel/vmlinux.lds.S b/arch/hexagon/kernel/vmlinux.lds.S
index 5f268c1071b3..a358b699ec64 100644
--- a/arch/hexagon/kernel/vmlinux.lds.S
+++ b/arch/hexagon/kernel/vmlinux.lds.S
@@ -51,7 +51,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.fixup)
}
_etext = .;
diff --git a/arch/ia64/kernel/jprobes.S b/arch/ia64/kernel/jprobes.S
index f69389c7be1d..c6c23a3e92fb 100644
--- a/arch/ia64/kernel/jprobes.S
+++ b/arch/ia64/kernel/jprobes.S
@@ -50,7 +50,7 @@
/*
* void jprobe_break(void)
*/
- .section .kprobes.text, "ax"
+ .section .text.tbl.kprobes.all, "ax"
ENTRY(jprobe_break)
break.m __IA64_BREAK_JPROBE
END(jprobe_break)
diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S
index dc506b05ffbd..884f36d38989 100644
--- a/arch/ia64/kernel/vmlinux.lds.S
+++ b/arch/ia64/kernel/vmlinux.lds.S
@@ -47,7 +47,6 @@ SECTIONS {
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.gnu.linkonce.t*)
}
diff --git a/arch/ia64/lib/flush.S b/arch/ia64/lib/flush.S
index 1d8c88860063..7f257810e858 100644
--- a/arch/ia64/lib/flush.S
+++ b/arch/ia64/lib/flush.S
@@ -20,7 +20,7 @@
*
* Note: "in0" and "in1" are preserved for debugging purposes.
*/
- .section .kprobes.text,"ax"
+ .section .text.tbl.kprobes.all,"ax"
GLOBAL_ENTRY(flush_icache_range)
.prologue
@@ -72,7 +72,7 @@ END(flush_icache_range)
*
* Note: "in0" and "in1" are preserved for debugging purposes.
*/
- .section .kprobes.text,"ax"
+ .section .text.tbl.kprobes.all,"ax"
GLOBAL_ENTRY(clflush_cache_range)
.prologue
diff --git a/arch/metag/kernel/vmlinux.lds.S b/arch/metag/kernel/vmlinux.lds.S
index e12055e88bfe..da1689c85bc8 100644
--- a/arch/metag/kernel/vmlinux.lds.S
+++ b/arch/metag/kernel/vmlinux.lds.S
@@ -22,7 +22,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.text.*)
*(.gnu.warning)
diff --git a/arch/microblaze/kernel/vmlinux.lds.S b/arch/microblaze/kernel/vmlinux.lds.S
index be9488d69734..94c1c5574a77 100644
--- a/arch/microblaze/kernel/vmlinux.lds.S
+++ b/arch/microblaze/kernel/vmlinux.lds.S
@@ -34,7 +34,6 @@ SECTIONS {
EXIT_CALL
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
. = ALIGN (4) ;
_etext = . ;
diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index 0a93e83cd014..9183e9235651 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -56,7 +56,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.text.*)
*(.fixup)
diff --git a/arch/mn10300/kernel/vmlinux.lds.S b/arch/mn10300/kernel/vmlinux.lds.S
index 13c4814c29f8..ead5efc01802 100644
--- a/arch/mn10300/kernel/vmlinux.lds.S
+++ b/arch/mn10300/kernel/vmlinux.lds.S
@@ -31,7 +31,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.fixup)
*(.gnu.warning)
} = 0xcb
diff --git a/arch/nios2/kernel/vmlinux.lds.S b/arch/nios2/kernel/vmlinux.lds.S
index 326fab40a9de..dc8a84183700 100644
--- a/arch/nios2/kernel/vmlinux.lds.S
+++ b/arch/nios2/kernel/vmlinux.lds.S
@@ -39,7 +39,6 @@ SECTIONS
SCHED_TEXT
LOCK_TEXT
IRQENTRY_TEXT
- KPROBES_TEXT
} =0
_etext = .;
diff --git a/arch/openrisc/kernel/vmlinux.lds.S b/arch/openrisc/kernel/vmlinux.lds.S
index 2d69a853b742..b010cb75edc4 100644
--- a/arch/openrisc/kernel/vmlinux.lds.S
+++ b/arch/openrisc/kernel/vmlinux.lds.S
@@ -48,7 +48,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.fixup)
*(.text.__*)
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index 308f29081d46..9d9dc4984465 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -70,7 +70,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.text.do_softirq)
*(.text.sys_exit)
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 499d9f89435a..4e36e86338f3 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -218,7 +218,7 @@ name: \
.localentry name,.-name
#define _KPROBE(name) \
- .section ".kprobes.text","a"; \
+ .section ".text.tbl.kprobes.all","a"; \
.align 2 ; \
.type name,@function; \
.globl name; \
@@ -248,7 +248,7 @@ GLUE(.,name):
#define _GLOBAL_TOC(name) _GLOBAL(name)
#define _KPROBE(name) \
- .section ".kprobes.text","a"; \
+ .section ".text.tbl.kprobes.all","a"; \
.align 2 ; \
.globl name; \
.globl GLUE(.,name); \
@@ -280,7 +280,7 @@ n:
#define _GLOBAL_TOC(name) _GLOBAL(name)
#define _KPROBE(n) \
- .section ".kprobes.text","a"; \
+ .section ".text.tbl.kprobes.all","a"; \
.globl n; \
n:
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index d41fd0af8980..8779ae180783 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -53,7 +53,6 @@ SECTIONS
*(.text .fixup __ftr_alt_* .ref.text)
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
#ifdef CONFIG_PPC32
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index cd5a191381b9..b09aa9ab5a1f 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -162,7 +162,7 @@ _PIF_WORK = (_PIF_PER_TRAP)
tm off+\addr, \mask
.endm
- .section .kprobes.text, "ax"
+ .section .text.tbl.kprobes.all, "ax"
/*
* Scheduler resume function, called by switch_to
@@ -965,7 +965,7 @@ ENTRY(restart_int_handler)
brc 2,2b
3: j 3b
- .section .kprobes.text, "ax"
+ .section .text.tbl.kprobes.all, "ax"
#ifdef CONFIG_CHECK_STACK
/*
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 250f5972536a..376d4bd487c5 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -288,7 +288,7 @@ static void kprobe_reenter_check(struct kprobe_ctlblk *kcb, struct kprobe *p)
default:
/*
* A kprobe on the code path to single step an instruction
- * is a BUG. The code path resides in the .kprobes.text
+ * is a BUG. The code path resides in the .text.tbl.kprobes.all
* section and is executed with interrupts disabled.
*/
printk(KERN_EMERG "Invalid kprobe detected at %p.\n", p->addr);
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
index e499370fbccb..4572045b968e 100644
--- a/arch/s390/kernel/mcount.S
+++ b/arch/s390/kernel/mcount.S
@@ -10,7 +10,7 @@
#include <asm/ftrace.h>
#include <asm/ptrace.h>
- .section .kprobes.text, "ax"
+ .section .text.tbl.kprobes.all, "ax"
ENTRY(ftrace_stub)
br %r14
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index 445657fe658c..4614b5bcab5e 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -26,7 +26,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.fixup)
*(.gnu.warning)
diff --git a/arch/score/kernel/vmlinux.lds.S b/arch/score/kernel/vmlinux.lds.S
index 7274b5c4287e..36ebcb3b1215 100644
--- a/arch/score/kernel/vmlinux.lds.S
+++ b/arch/score/kernel/vmlinux.lds.S
@@ -41,7 +41,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
*(.text.*)
*(.fixup)
. = ALIGN (4) ;
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index db88cbf9eafd..af4f37375345 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -37,7 +37,6 @@ SECTIONS
EXTRA_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.fixup)
*(.gnu.warning)
diff --git a/arch/sparc/kernel/vmlinux.lds.S b/arch/sparc/kernel/vmlinux.lds.S
index f1a2f688b28a..a1c8e3a3ebb6 100644
--- a/arch/sparc/kernel/vmlinux.lds.S
+++ b/arch/sparc/kernel/vmlinux.lds.S
@@ -46,7 +46,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
*(.gnu.warning)
} = 0
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index b4f4733abc6e..a08fb40656ac 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -148,7 +148,7 @@ __spitfire_flush_tlb_mm_slow:
/*
* The following code flushes one page_size worth.
*/
- .section .kprobes.text, "ax"
+ .section .text.tbl.kprobes.all, "ax"
.align 32
.globl __flush_icache_page
__flush_icache_page: /* %o0 = phys_page */
diff --git a/arch/tile/kernel/vmlinux.lds.S b/arch/tile/kernel/vmlinux.lds.S
index 0e059a0101ea..0f04268fc394 100644
--- a/arch/tile/kernel/vmlinux.lds.S
+++ b/arch/tile/kernel/vmlinux.lds.S
@@ -43,7 +43,6 @@ SECTIONS
HEAD_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
IRQENTRY_TEXT
__fix_text_end = .; /* tile-cpack won't rearrange before this */
ALIGN_FUNCTION();
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 1deffe6cc873..dde4ec0e0185 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -577,7 +577,10 @@ static int reenter_kprobe(struct kprobe *p, struct pt_regs *regs,
case KPROBE_REENTER:
/* A probe has been hit in the codepath leading up to, or just
* after, single-stepping of a probed instruction. This entire
- * codepath should strictly reside in .kprobes.text section.
+ * codepath should strictly reside in the kprobes section:
+ *
+ * SECTION_TBL(SECTION_TEXT, kprobes, all)
+ *
* Raise a BUG or we'll continue in an endless reentering loop
* and eventually a stack overflow.
*/
@@ -1114,10 +1117,9 @@ NOKPROBE_SYMBOL(longjmp_break_handler);
bool arch_within_kprobe_blacklist(unsigned long addr)
{
- return (addr >= (unsigned long)__kprobes_text_start &&
- addr < (unsigned long)__kprobes_text_end) ||
+ return (LINKTABLE_ADDR_WITHIN(kprobes, addr) ||
(addr >= (unsigned long)__entry_text_start &&
- addr < (unsigned long)__entry_text_end);
+ addr < (unsigned long)__entry_text_end));
}
int __init arch_init_kprobes(void)
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 74e4bf11f562..80a9f9106d2a 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -99,7 +99,6 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
- KPROBES_TEXT
ENTRY_TEXT
IRQENTRY_TEXT
*(.fixup)
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index f5ea98bd85d2..0438aab5cb58 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -24,7 +24,7 @@
* Following global variables are optional and may be unavailable on some
* architectures and/or kernel configurations.
* _text, _data
- * __kprobes_text_start, __kprobes_text_end
+ * LINKTABLE_START(kprobes), LINKTABLE_END(kprobes)
* __entry_text_start, __entry_text_end
* __ctors_start, __ctors_end
*/
@@ -35,7 +35,7 @@ extern char __init_begin[], __init_end[];
extern char _sinittext[], _einittext[];
extern char _end[];
extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
-extern char __kprobes_text_start[], __kprobes_text_end[];
+DECLARE_LINKTABLE_TEXT(char, kprobes);
extern char __entry_text_start[], __entry_text_end[];
extern char __start_rodata[], __end_rodata[];
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c5fcac902cbe..f1420714a549 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -112,15 +112,6 @@
#define BRANCH_PROFILE()
#endif
-#ifdef CONFIG_KPROBES
-#define KPROBE_BLACKLIST() . = ALIGN(8); \
- VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
- *(_kprobe_blacklist) \
- VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
-#else
-#define KPROBE_BLACKLIST()
-#endif
-
#ifdef CONFIG_EVENT_TRACING
#define FTRACE_EVENTS() . = ALIGN(8); \
VMLINUX_SYMBOL(__start_ftrace_events) = .; \
@@ -433,12 +424,6 @@
*(.spinlock.text) \
VMLINUX_SYMBOL(__lock_text_end) = .;
-#define KPROBES_TEXT \
- ALIGN_FUNCTION(); \
- VMLINUX_SYMBOL(__kprobes_text_start) = .; \
- *(.kprobes.text) \
- VMLINUX_SYMBOL(__kprobes_text_end) = .;
-
#define ENTRY_TEXT \
ALIGN_FUNCTION(); \
VMLINUX_SYMBOL(__entry_text_start) = .; \
@@ -504,7 +489,6 @@
*(.init.rodata) \
FTRACE_EVENTS() \
TRACE_SYSCALLS() \
- KPROBE_BLACKLIST() \
MEM_DISCARD(init.rodata) \
CLK_OF_TABLES() \
RESERVEDMEM_OF_TABLES() \
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 00b042c49ccd..8e33fc1ffd3c 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -546,7 +546,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */
#ifdef CONFIG_KPROBES
-# define __kprobes __attribute__((__section__(".kprobes.text")))
+#include <linux/sections.h>
+# define __kprobes __attribute__((__section__(SECTION_TBL(SECTION_TEXT, kprobes, all))))
# define nokprobe_inline __always_inline
#else
# define __kprobes
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 8f6849084248..544eb59cdbb9 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -42,8 +42,12 @@
#include <linux/ftrace.h>
#ifdef CONFIG_KPROBES
+#include <linux/tables.h>
#include <asm/kprobes.h>
+DECLARE_LINKTABLE_TEXT(char, kprobes);
+DECLARE_LINKTABLE_INIT_DATA(unsigned long, _kprobe_blacklist);
+
/* kprobe_status settings */
#define KPROBE_HIT_ACTIVE 0x00000001
#define KPROBE_HIT_SS 0x00000002
@@ -487,8 +491,7 @@ static inline int enable_jprobe(struct jprobe *jp)
* by using this macro.
*/
#define __NOKPROBE_SYMBOL(fname) \
-static unsigned long __used \
- __attribute__((section("_kprobe_blacklist"))) \
+static LINKTABLE_INIT_DATA(_kprobe_blacklist, all) \
_kbl_addr_##fname = (unsigned long)fname;
#define NOKPROBE_SYMBOL(fname) __NOKPROBE_SYMBOL(fname)
#else
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index d10ab6b9b5e0..d816c659f358 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1328,8 +1328,7 @@ out:
bool __weak arch_within_kprobe_blacklist(unsigned long addr)
{
/* The __kprobes marked functions and entry code must not be probed */
- return addr >= (unsigned long)__kprobes_text_start &&
- addr < (unsigned long)__kprobes_text_end;
+ return LINKTABLE_ADDR_WITHIN(kprobes, addr);
}
bool within_kprobe_blacklist(unsigned long addr)
@@ -2054,14 +2053,13 @@ NOKPROBE_SYMBOL(dump_kprobe);
* since a kprobe need not necessarily be at the beginning
* of a function.
*/
-static int __init populate_kprobe_blacklist(unsigned long *start,
- unsigned long *end)
+static int __init populate_kprobe_blacklist(void)
{
unsigned long *iter;
struct kprobe_blacklist_entry *ent;
unsigned long entry, offset = 0, size = 0;
- for (iter = start; iter < end; iter++) {
+ LINKTABLE_FOR_EACH(iter, _kprobe_blacklist) {
entry = arch_deref_entry_point((void *)*iter);
if (!kernel_text_address(entry) ||
@@ -2126,8 +2124,9 @@ static struct notifier_block kprobe_module_nb = {
};
/* Markers of _kprobe_blacklist section */
-extern unsigned long __start_kprobe_blacklist[];
-extern unsigned long __stop_kprobe_blacklist[];
+DEFINE_LINKTABLE_INIT_DATA(unsigned long, _kprobe_blacklist);
+/* Actual kprobes linker table */
+DEFINE_LINKTABLE_TEXT(char, kprobes);
static int __init init_kprobes(void)
{
@@ -2141,8 +2140,7 @@ static int __init init_kprobes(void)
raw_spin_lock_init(&(kretprobe_table_locks[i].lock));
}
- err = populate_kprobe_blacklist(__start_kprobe_blacklist,
- __stop_kprobe_blacklist);
+ err = populate_kprobe_blacklist();
if (err) {
pr_err("kprobes: failed to populate blacklist: %d\n", err);
pr_err("Please take care of using kprobes.\n");
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 48958d3cec9e..b0a8f519efb8 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -22,6 +22,7 @@
#include "../../include/generated/autoconf.h"
#include "../../include/linux/license.h"
#include "../../include/linux/export.h"
+#include "../../include/linux/sections.h"
/* Are we using CONFIG_MODVERSIONS? */
static int modversions = 0;
@@ -888,7 +889,7 @@ static void check_section(const char *modname, struct elf_info *elf,
#define DATA_SECTIONS ".data", ".data.rel"
#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
- ".kprobes.text"
+ SECTION_TBL(SECTION_TEXT, kprobes, all)
#define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
".fixup", ".entry.text", ".exception.text", ".text.*", \
".coldtext"
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index e167592793a7..f37dac17f033 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -32,6 +32,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include "../../include/linux/sections.h"
#ifndef EM_METAG
/* Remove this when these make it to the standard system elf.h. */
@@ -356,7 +357,7 @@ is_mcounted_section_name(char const *const txtname)
strcmp(".sched.text", txtname) == 0 ||
strcmp(".spinlock.text", txtname) == 0 ||
strcmp(".irqentry.text", txtname) == 0 ||
- strcmp(".kprobes.text", txtname) == 0 ||
+ strcmp(SECTION_TBL(SECTION_TEXT, kprobe, all), txtname) == 0 ||
strcmp(".text.unlikely", txtname) == 0;
}
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 96e2486a6fc4..63e13009dda9 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -134,7 +134,7 @@ my %text_sections = (
".sched.text" => 1,
".spinlock.text" => 1,
".irqentry.text" => 1,
- ".kprobes.text" => 1,
+ ".text.tbl.kprobes.all" => 1,
".text.unlikely" => 1,
);
--
2.7.0
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