@@ -9,7 +9,7 @@
#include <asm/processor.h>
#include <asm/ppc-opcode.h>
#include <asm/firmware.h>
-#include <asm/ranges.h>
+#include <asm/tables.h>
#ifdef __ASSEMBLY__
@@ -266,7 +266,7 @@ GLUE(.,name):
*/
#ifdef CONFIG_KPROBES
#define _ASM_NOKPROBE_SYMBOL(entry) \
- .pushsection "_kprobe_blacklist","aw"; \
+ push_section_tbl(.init.data, _kprobe_blacklist, any, aw); \
PPC_LONG (entry) ; \
.popsection
#else
@@ -1,6 +1,8 @@
#ifndef _ASM_X86_ASM_H
#define _ASM_X86_ASM_H
+#include <asm/tables.h>
+
#ifdef __ASSEMBLY__
# define __ASM_FORM(x) x
# define __ASM_FORM_RAW(x) x
@@ -74,7 +76,7 @@
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
# define _ASM_NOKPROBE(entry) \
- .pushsection "_kprobe_blacklist","aw" ; \
+ push_section_tbl_any(.init.data, _kprobe_blacklist, aw);\
_ASM_ALIGN ; \
_ASM_PTR (entry); \
.popsection
@@ -3,14 +3,14 @@
#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
#ifdef CONFIG_KPROBES
+#include <linux/tables.h>
#include <asm/ranges.h>
/*
* Blacklist ganerating macro. Specify functions which is not probed
* 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)
/* Use this to forbid a kprobes attach on very low level functions */
@@ -114,15 +114,6 @@
#define BRANCH_PROFILE()
#endif
-#ifdef CONFIG_KPROBES
-#define KPROBE_BLACKLIST() . = ALIGN(8); \
- VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
- KEEP(*(_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) = .; \
@@ -551,7 +542,6 @@
*(.init.rodata) \
FTRACE_EVENTS() \
TRACE_SYSCALLS() \
- KPROBE_BLACKLIST() \
MEM_DISCARD(init.rodata) \
CLK_OF_TABLES() \
RESERVEDMEM_OF_TABLES() \
@@ -44,8 +44,10 @@
#ifdef CONFIG_KPROBES
#include <linux/ranges.h>
+#include <linux/tables.h>
DECLARE_SECTION_RANGE(kprobes);
+DECLARE_LINKTABLE(unsigned long, _kprobe_blacklist);
/* kprobe_status settings */
#define KPROBE_HIT_ACTIVE 0x00000001
@@ -2053,14 +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) ||
@@ -2125,8 +2124,7 @@ 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 section range */
DEFINE_SECTION_RANGE(kprobes, .text);
@@ -2143,8 +2141,7 @@ 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");
kprobe makes use of two sections, the one dealing with the actual kprobes was recently ported using the standard section range API. The blacklist functionality of kprobes is still using a custom section and declaring its custom section using the linker script as follows: type Linux-section custom section name begin end table .init.data _kprobe_blacklist __start_kprobe_blacklist __stop_kprobe_blacklist This ports the _kprobe_blacklist custom section to the standard Linux linker table API allowing us remove all the custom blacklist kprobe section declarations from the linker script. This has been tested by trying to register a kprobe on a blacklisted symbol (these are declared with NOKPROBE_SYMBOL()), and confirms that this fails to work as expected. This was tested with: # insmod samples/kprobes/kprobe_example.ko symbol="get_kprobe" This fails to load as expected with: insmod: ERROR: could not insert module samples/kprobes/kprobe_example.ko: Invalid parameters v5: Use push_section_tbl() for _ASM_NOKPROBE() for x86, and _ASM_NOKPROBE_SYMBOL() on powerpc v4: ported over _ASM_NOKPROBE_SYMBOL() on powerpc and ASM_NOKPROBE() on x86 v3: this patch was introduced in this series Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> --- arch/powerpc/include/asm/ppc_asm.h | 4 ++-- arch/x86/include/asm/asm.h | 4 +++- include/asm-generic/kprobes.h | 4 ++-- include/asm-generic/vmlinux.lds.h | 10 ---------- include/linux/kprobes.h | 2 ++ kernel/kprobes.c | 11 ++++------- 6 files changed, 13 insertions(+), 22 deletions(-)