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authorNicolas Pitre <nico@cam.org>2007-12-03 15:27:56 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-26 15:25:17 +0000
commit785d3cd286f0bf67d1bf692559b9ae5de12678f5 (patch)
treed533f0ab4792b1df11a0f862ec7246bb4455869c /arch/arm/kernel
parentd30a0c8bf99f0e6a7d8c57bd4524039585ffbced (diff)
ARM kprobes: prevent some functions involved with kprobes from being probed
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/entry-armv.S8
-rw-r--r--arch/arm/kernel/kprobes.c2
-rw-r--r--arch/arm/kernel/traps.c9
-rw-r--r--arch/arm/kernel/vmlinux.lds.S1
4 files changed, 9 insertions, 11 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 12ecc817be3..3727537f582 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -58,6 +58,12 @@
.endm
+#ifdef CONFIG_KPROBES
+ .section .kprobes.text,"ax",%progbits
+#else
+ .text
+#endif
+
/*
* Invalid mode handlers
*/
@@ -562,7 +568,7 @@ do_fpe:
.data
ENTRY(fp_enter)
.word no_fp
- .text
+ .previous
no_fp: mov pc, lr
diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c
index a18a8458e99..450ee2cbfe1 100644
--- a/arch/arm/kernel/kprobes.c
+++ b/arch/arm/kernel/kprobes.c
@@ -55,7 +55,7 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
unsigned long addr = (unsigned long)p->addr;
int is;
- if (addr & 0x3)
+ if (addr & 0x3 || in_exception_text(addr))
return -EINVAL;
insn = *p->addr;
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index c34db4e868f..65bb762b2d8 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -46,15 +46,6 @@ __setup("user_debug=", user_debug_setup);
static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
-static inline int in_exception_text(unsigned long ptr)
-{
- extern char __exception_text_start[];
- extern char __exception_text_end[];
-
- return ptr >= (unsigned long)&__exception_text_start &&
- ptr < (unsigned long)&__exception_text_end;
-}
-
void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
{
#ifdef CONFIG_KALLSYMS
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 5ff5406666b..30f732c7fdb 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -94,6 +94,7 @@ SECTIONS
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
+ KPROBES_TEXT
#ifdef CONFIG_MMU
*(.fixup)
#endif