diff options
Diffstat (limited to 'arch/s390/kernel/signal.c')
| -rw-r--r-- | arch/s390/kernel/signal.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index 4c28c39e3718..fb535874a246 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -58,7 +58,7 @@ static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) /* Copy a 'clean' PSW mask to the user to avoid leaking information about whether PER is currently on. */ user_sregs.regs.psw.mask = PSW_USER_BITS | - (regs->psw.mask & PSW_MASK_USER); + (regs->psw.mask & (PSW_MASK_USER | PSW_MASK_RI)); user_sregs.regs.psw.addr = regs->psw.addr; memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); memcpy(&user_sregs.regs.acrs, current->thread.acrs, @@ -86,13 +86,16 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) if (__copy_from_user(&user_sregs, sregs, sizeof(user_sregs))) return -EFAULT; + if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI)) + return -EINVAL; + /* Loading the floating-point-control word can fail. Do that first. */ if (restore_fp_ctl(&user_sregs.fpregs.fpc)) return -EINVAL; /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */ regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | - (user_sregs.regs.psw.mask & PSW_MASK_USER); + (user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI)); /* Check for invalid user address space control. */ if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME) regs->psw.mask = PSW_ASC_PRIMARY | |