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Fix stack smashing when handling PR_GET_PDEATHSIG

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The bug was triggered by the following code on aarch64-linux-user:

int main(void)
{
  int PDeathSig = 0;
  if (prctl(PR_GET_PDEATHSIG, &PDeathSig) == 0 && PDeathSig == SIGKILL)
    prctl(PR_GET_PDEATHSIG, 0);
  return (PDeathSig == SIGKILL);
}

Signed-off-by: Stephen Long <steplong@quicinc.com>
Signed-off-by: Ana Pazos <apazos@quicinc.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200507130302.3684-1-steplong@quicinc.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Stephen Long 2020-05-07 06:03:02 -07:00 committed by Laurent Vivier
parent 4c5b97bfd0
commit d9a5eba477
1 changed files with 1 additions and 1 deletions
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2
linux-user/syscall.c
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@ -10703,7 +10703,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
int deathsig;
ret = get_errno(prctl(arg1, &deathsig, arg3, arg4, arg5));
if (!is_error(ret) && arg2
&& put_user_ual(deathsig, arg2)) {
&& put_user_s32(deathsig, arg2)) {
return -TARGET_EFAULT;
}
return ret;