From c7b645f934e52a54af58142d91fb51f881f8ce26 Mon Sep 17 00:00:00 2001 From: Keshavamurthy Anil S Date: Mon, 27 Jun 2005 15:17:16 -0700 Subject: [PATCH] kprobes/ia64: refuse kprobe on ivt code Not safe to insert kprobes on IVT code. This patch checks to see if the address on which Kprobes is being inserted is in ivt code and if it is in ivt code then refuse to register kprobe. Signed-off-by: Anil S Keshavamurthy Acked-by: David Mosberger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/kernel/kprobes.c | 18 ++++++++++++++++-- arch/ia64/kernel/vmlinux.lds.S | 7 ++++++- 2 files changed, 22 insertions(+), 3 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index ec2ceade12b0..3aa3167edbec 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -34,6 +34,7 @@ #include #include +#include extern void jprobe_inst_return(void); @@ -263,14 +264,27 @@ static inline void get_kprobe_inst(bundle_t *bundle, uint slot, } } +/* Returns non-zero if the addr is in the Interrupt Vector Table */ +static inline int in_ivt_functions(unsigned long addr) +{ + return (addr >= (unsigned long)__start_ivt_text + && addr < (unsigned long)__end_ivt_text); +} + static int valid_kprobe_addr(int template, int slot, unsigned long addr) { if ((slot > 2) || ((bundle_encoding[template][1] == L) && slot > 1)) { - printk(KERN_WARNING "Attempting to insert unaligned kprobe at 0x%lx\n", - addr); + printk(KERN_WARNING "Attempting to insert unaligned kprobe " + "at 0x%lx\n", addr); return -EINVAL; } + if (in_ivt_functions(addr)) { + printk(KERN_WARNING "Kprobes can't be inserted inside " + "IVT functions at 0x%lx\n", addr); + return -EINVAL; + } + if (slot == 1 && bundle_encoding[template][1] != L) { printk(KERN_WARNING "Inserting kprobes on slot #1 " "is not supported\n"); diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S index b9f0db4c1b04..a676e79e0681 100644 --- a/arch/ia64/kernel/vmlinux.lds.S +++ b/arch/ia64/kernel/vmlinux.lds.S @@ -8,6 +8,11 @@ #define LOAD_OFFSET (KERNEL_START - KERNEL_TR_PAGE_SIZE) #include +#define IVT_TEXT \ + VMLINUX_SYMBOL(__start_ivt_text) = .; \ + *(.text.ivt) \ + VMLINUX_SYMBOL(__end_ivt_text) = .; + OUTPUT_FORMAT("elf64-ia64-little") OUTPUT_ARCH(ia64) ENTRY(phys_start) @@ -39,7 +44,7 @@ SECTIONS .text : AT(ADDR(.text) - LOAD_OFFSET) { - *(.text.ivt) + IVT_TEXT *(.text) SCHED_TEXT LOCK_TEXT -- cgit v1.2.2