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tile: use si_int instead of si_ptr for compat_siginfo

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To be compatible with the generic get_compat_sigevent(), the
copy_siginfo_to_user32() and thus copy_siginfo_from_user32()
have to use si_int instead of si_ptr.  Using si_ptr means that
for the case of ILP32 compat code running in big-endian mode,
we would end up copying the high 32 bits of the pointer value
into si_int instead of the desired low 32 bits.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Chris Metcalf 2015-03-16 15:04:05 -04:00
parent c517d838eb
commit 89067c2daf
1 changed files with 5 additions and 6 deletions
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11
arch/tile/kernel/compat_signal.c
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@ -68,7 +68,7 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
if (from->si_code < 0) {
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
err |= __put_user(from->si_int, &to->si_int);
} else {
/*
* First 32bits of unions are always present:
@ -93,8 +93,7 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
break;
case __SI_TIMER >> 16:
err |= __put_user(from->si_overrun, &to->si_overrun);
err |= __put_user(ptr_to_compat(from->si_ptr),
&to->si_ptr);
err |= __put_user(from->si_int, &to->si_int);
break;
/* This is not generated by the kernel as of now. */
case __SI_RT >> 16:
@ -110,19 +109,19 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *fr
int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
{
int err;
u32 ptr32;
if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo)))
return -EFAULT;
memset(to, 0, sizeof(*to));
err = __get_user(to->si_signo, &from->si_signo);
err |= __get_user(to->si_errno, &from->si_errno);
err |= __get_user(to->si_code, &from->si_code);
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
err |= __get_user(ptr32, &from->si_ptr);
to->si_ptr = compat_ptr(ptr32);
err |= __get_user(to->si_int, &from->si_int);
return err;
}