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Lock Giant around calls to useracc() in osf1_sigreturn() so that the

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function is MP safe.
This commit is contained in:
John Baldwin 2003-04-25 19:52:30 +00:00
parent b11c8f53dc
commit fdbaa60278
1 changed files with 5 additions and 1 deletions
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6
sys/alpha/osf1/osf1_signal.c
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@ -572,6 +572,7 @@ osf1_sigreturn(struct thread *td,
p = td->td_proc; p = td->td_proc;
scp = uap->sigcntxp; scp = uap->sigcntxp;
mtx_lock(&Giant);
if (useracc((caddr_t)scp, sizeof (*scp), VM_PROT_READ) == 0 ) { if (useracc((caddr_t)scp, sizeof (*scp), VM_PROT_READ) == 0 ) {
uprintf("uac fails\n"); uprintf("uac fails\n");
uprintf("scp: %p\n", scp); uprintf("scp: %p\n", scp);
@ -581,8 +582,11 @@ osf1_sigreturn(struct thread *td,
* We grab it all at once for speed. * We grab it all at once for speed.
*/ */
if (useracc((caddr_t)scp, sizeof (*scp), VM_PROT_READ) == 0 || if (useracc((caddr_t)scp, sizeof (*scp), VM_PROT_READ) == 0 ||
copyin((caddr_t)scp, (caddr_t)&ksc, sizeof ksc)) copyin((caddr_t)scp, (caddr_t)&ksc, sizeof ksc)) {
mtx_unlock(&Giant);
return (EFAULT); return (EFAULT);
}
mtx_unlock(&Giant);
/* /*
* Restore the user-supplied information. * Restore the user-supplied information.