diff options
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
| -rw-r--r-- | arch/powerpc/kernel/signal_64.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c index 1decf2785530..5462bef898f6 100644 --- a/arch/powerpc/kernel/signal_64.c +++ b/arch/powerpc/kernel/signal_64.c @@ -96,8 +96,10 @@ long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int while (1) { current->state = TASK_INTERRUPTIBLE; schedule(); - if (do_signal(&saveset, regs)) + if (do_signal(&saveset, regs)) { + set_thread_flag(TIF_RESTOREALL); return 0; + } } } @@ -152,6 +154,14 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, err |= __put_user(0, &sc->v_regs); #endif /* CONFIG_ALTIVEC */ err |= __put_user(&sc->gp_regs, &sc->regs); + if (!FULL_REGS(regs)) { + /* Zero out the unsaved GPRs to avoid information + leak, and set TIF_SAVE_NVGPRS to ensure that the + registers do actually get saved later. */ + memset(®s->gpr[14], 0, 18 * sizeof(unsigned long)); + set_thread_flag(TIF_SAVE_NVGPRS); + current_thread_info()->nvgprs_frame = &sc->gp_regs; + } err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE); err |= __copy_to_user(&sc->fp_regs, ¤t->thread.fpr, FP_REGS_SIZE); err |= __put_user(signr, &sc->signal); @@ -340,6 +350,7 @@ int sys_swapcontext(struct ucontext __user *old_ctx, do_exit(SIGSEGV); /* This returns like rt_sigreturn */ + set_thread_flag(TIF_RESTOREALL); return 0; } @@ -372,7 +383,8 @@ int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5, */ do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]); - return regs->result; + set_thread_flag(TIF_RESTOREALL); + return 0; badframe: #if DEBUG_SIG @@ -454,9 +466,6 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info, if (err) goto badframe; - if (test_thread_flag(TIF_SINGLESTEP)) - ptrace_notify(SIGTRAP); - return 1; badframe: @@ -502,6 +511,8 @@ static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) * we only get here if there is a handler, we dont restart. */ regs->result = -EINTR; + regs->gpr[3] = EINTR; + regs->ccr |= 0x10000000; break; case -ERESTARTSYS: /* ERESTARTSYS means to restart the syscall if there is no @@ -509,6 +520,8 @@ static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) */ if (!(ka->sa.sa_flags & SA_RESTART)) { regs->result = -EINTR; + regs->gpr[3] = EINTR; + regs->ccr |= 0x10000000; break; } /* fallthrough */ |