Messages in this thread Patch in this message | | | Date | Wed, 25 Mar 1998 15:49:12 +0100 (CET) | From | Andrea Arcangeli <> | Subject | [2.1.90 patch] SMP sys_idle() user level hang |
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This program call sys_idle() and then the process became unkillable since sys_idle should not be used from userland.
void main() { __asm__ volatile ("int $0x80" : : "a" ((long)0x70)); }
Here the patch: --- linux/arch/i386/kernel/process.c 1998/03/25 14:29:40 1.1 +++ linux/arch/i386/kernel/process.c 1998/03/25 14:35:05 @@ -171,6 +171,8 @@ asmlinkage int sys_idle(void) { + if (current->pid != 0) + return -EPERM; cpu_idle(NULL); return 0; }
Thanks to Eliott for the tipsy.c program that showed this up (but please Eliott remeber to tell people run it as nobody!!!!!! for example with `echo ~andrea/devel/tipsy | su - nobody`). Not it' s running from some minutes and no more problems here. Andrea[s] Arcangeli
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