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MIPS: traps: Fix SIGFPE information leak from do_ov' and do_trap_or_bp'

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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>
This commit is contained in:
Maciej W. Rozycki 2016-03-04 01:42:49 +00:00 committed by Ralf Baechle
parent 887349f69f
commit e723e3f7f9
1 changed files with 6 additions and 7 deletions
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13
arch/mips/kernel/traps.c
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@ -690,15 +690,15 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
asmlinkage void do_ov(struct pt_regs *regs) asmlinkage void do_ov(struct pt_regs *regs)
{ {
enum ctx_state prev_state; enum ctx_state prev_state;
siginfo_t info; siginfo_t info = {
.si_signo = SIGFPE,
.si_code = FPE_INTOVF,
.si_addr = (void __user *)regs->cp0_epc,
};
prev_state = exception_enter(); prev_state = exception_enter();
die_if_kernel("Integer overflow", regs); die_if_kernel("Integer overflow", regs);
info.si_code = FPE_INTOVF;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current); force_sig_info(SIGFPE, &info, current);
exception_exit(prev_state); exception_exit(prev_state);
} }
@ -874,7 +874,7 @@ out:
void do_trap_or_bp(struct pt_regs *regs, unsigned int code, void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
const char *str) const char *str)
{ {
siginfo_t info; siginfo_t info = { 0 };
char b[40]; char b[40];
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
@ -903,7 +903,6 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
else else
info.si_code = FPE_INTOVF; info.si_code = FPE_INTOVF;
info.si_signo = SIGFPE; info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void __user *) regs->cp0_epc; info.si_addr = (void __user *) regs->cp0_epc;
force_sig_info(SIGFPE, &info, current); force_sig_info(SIGFPE, &info, current);
break; break;