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MIPS: traps: Fix SIGFPE information leak from do_ov' and
do_trap_or_bp'
Avoid sending a partially initialised `siginfo_t' structure along SIGFPE signals issued from `do_ov' and `do_trap_or_bp', leading to information leaking from the kernel stack. Signed-off-by: Maciej W. Rozycki <macro@imgtec.com> Cc: stable@vger.kernel.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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parent
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commit
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1 changed files with 6 additions and 7 deletions
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@ -690,15 +690,15 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
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asmlinkage void do_ov(struct pt_regs *regs)
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{
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enum ctx_state prev_state;
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siginfo_t info;
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siginfo_t info = {
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.si_signo = SIGFPE,
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.si_code = FPE_INTOVF,
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.si_addr = (void __user *)regs->cp0_epc,
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};
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prev_state = exception_enter();
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die_if_kernel("Integer overflow", regs);
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info.si_code = FPE_INTOVF;
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info.si_signo = SIGFPE;
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info.si_errno = 0;
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info.si_addr = (void __user *) regs->cp0_epc;
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force_sig_info(SIGFPE, &info, current);
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exception_exit(prev_state);
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}
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@ -874,7 +874,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
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void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
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const char *str)
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{
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siginfo_t info;
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siginfo_t info = { 0 };
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char b[40];
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#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
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@ -903,7 +903,6 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
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else
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info.si_code = FPE_INTOVF;
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info.si_signo = SIGFPE;
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info.si_errno = 0;
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info.si_addr = (void __user *) regs->cp0_epc;
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force_sig_info(SIGFPE, &info, current);
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break;
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