Messages in this thread Patch in this message | | | Date | Wed, 29 Jun 2005 15:24:22 +0000 | From | Luca Falavigna <> | Subject | [PATCH] Kprobes: Verify probepoint in register_jprobe() |
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This patch, built against version 2.6.12, checks if probepoint address is a function entry point using an offset value, obtained from kallsyms_lookup(). If offset is zero, we register jprobe, otherwise we return -EINVAL.
Signed-off-by: Luca Falavigna <dktrkranz@gmail.com>
--- ./kernel/kprobes.c.orig 2005-06-29 00:17:43.000000000 +0000 +++ ./kernel/kprobes.c 2005-06-29 11:08:02.000000000 +0000 @@ -33,6 +33,7 @@ #include <linux/hash.h> #include <linux/init.h> #include <linux/module.h> +#include <linux/kallsyms.h> #include <asm/cacheflush.h> #include <asm/errno.h> #include <asm/kdebug.h> @@ -245,7 +246,15 @@ static struct notifier_block kprobe_exce
int register_jprobe(struct jprobe *jp) { - /* Todo: Verify probepoint is a function entry point */ + unsigned long size, offset; + char *modname, namebuf[KSYM_NAME_LEN+1]; + + kallsyms_lookup((unsigned long)jp->kp.addr, &size, + &offset, &modname, namebuf); + + if(unlikely(offset)) + return -EINVAL; + jp->kp.pre_handler = setjmp_pre_handler; jp->kp.break_handler = longjmp_break_handler;
Regards, -- Luca
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