On Tue, 16 Jan 2007 15:13:32 -0500
Neil Horman <[email protected]> wrote:
> As it is currently written, sys_select checks its return code to convert
> ERESTARTNOHAND to EINTR. However, the check is within an if (tvp) clause, and
> so if select is called from userspace with a NULL timeval, then it is possible
> for the ERESTARTNOHAND errno to leak into userspace, which is incorrect. This
> patch moves that check outside of the conditional, and prevents the errno leak.
the ERESTARTNOHAND thing is handled in arch specific signal code,
syscalls can return -ERESTARTNOHAND as much as they want (and your
change breaks the current behaviour of select()).
For example:
arch/x86_64/kernel/signal.c
/* Are we from a system call? */
if ((long)regs->orig_rax >= 0) {
/* If so, check system call restarting.. */
switch (regs->rax) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->rax = -EINTR;
break;
--
Paolo Ornati
Linux 2.6.20-rc5 on x86_64
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