diff options
| author | Nicolas Pitre <nico@cam.org> | 2007-12-03 21:27:56 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 16:25:17 +0100 |
| commit | 785d3cd286f0bf67d1bf692559b9ae5de12678f5 (patch) | |
| tree | d533f0ab4792b1df11a0f862ec7246bb4455869c /arch/arm/kernel | |
| parent | ARM kprobes: don't let a single-stepped stmdb corrupt the exception stack (diff) | |
| download | linux-785d3cd286f0bf67d1bf692559b9ae5de12678f5.tar.xz linux-785d3cd286f0bf67d1bf692559b9ae5de12678f5.zip | |
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.S | 8 | ||||
| -rw-r--r-- | arch/arm/kernel/kprobes.c | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/traps.c | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 1 |
4 files changed, 9 insertions, 11 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 12ecc817be3f..3727537f5825 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 a18a8458e99d..450ee2cbfe17 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 c34db4e868fa..65bb762b2d80 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 5ff5406666b4..30f732c7fdb5 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 |