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| author | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2008-05-12 17:58:48 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-06-05 18:13:14 +0100 |
| commit | 10220c884444a1866bb070e207d84fc18188e2a7 (patch) | |
| tree | d931cbfe5375a4e24ff05b3f6ae143b0b214416e /arch/mips | |
| parent | 057229f9efc7ebebd3ce0496195ed46df631f383 (diff) | |
| download | lwn-10220c884444a1866bb070e207d84fc18188e2a7.tar.gz lwn-10220c884444a1866bb070e207d84fc18188e2a7.zip | |
[MIPS] Fix check for valid stack pointer during backtrace
The newly added check for valid stack pointer address breaks at least for
64bit kernels. Use __get_user() for accessing stack content to avoid crashes,
when doing the backtrace.
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/traps.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index cb8b0e2c7954..f9165d1a17bf 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -88,15 +88,17 @@ static void show_raw_backtrace(unsigned long reg29) #ifdef CONFIG_KALLSYMS printk("\n"); #endif -#define IS_KVA01(a) ((((unsigned int)a) & 0xc0000000) == 0x80000000) - if (IS_KVA01(sp)) { - while (!kstack_end(sp)) { - addr = *sp++; - if (__kernel_text_address(addr)) - print_ip_sym(addr); + while (!kstack_end(sp)) { + unsigned long __user *p = + (unsigned long __user *)(unsigned long)sp++; + if (__get_user(addr, p)) { + printk(" (Bad stack address)"); + break; } - printk("\n"); + if (__kernel_text_address(addr)) + print_ip_sym(addr); } + printk("\n"); } #ifdef CONFIG_KALLSYMS |