ARM: 5793/1: ARM: Check put_user fail in do_signal when enable OABI_COMPAT
Using OABI, the call to put_user in do_signal can fail causing the calling app to hang. The solution is to check if put_user fails and force the app to seg fault in that case. Tested with multiple sleeping apps/threads (using the nanosleep syscall) and suspend/resume. Signed-off-by: janboe <janboe.ye at gmail.com> Signed-off-by: Jean Pihet <jpihet@mvista.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -662,8 +662,12 @@ static void do_signal(struct pt_regs *regs, int syscall)
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regs->ARM_sp -= 4;
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usp = (u32 __user *)regs->ARM_sp;
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put_user(regs->ARM_pc, usp);
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if (put_user(regs->ARM_pc, usp) == 0) {
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regs->ARM_pc = KERN_RESTART_CODE;
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} else {
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regs->ARM_sp += 4;
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force_sigsegv(0, current);
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}
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#endif
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}
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}
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