/* * vdso_restorer.c - tests vDSO-based signal restore * Copyright (c) 2015 Andrew Lutomirski * * This program is free software; you can redistribute it and/or modify * it under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * This makes sure that sa_restorer == NULL keeps working on 32-bit * configurations. Modern glibc doesn't use it under any circumstances, * so it's easy to overlook breakage. * * 64-bit userspace has never supported sa_restorer == NULL, so this is * 32-bit only. */ #define _GNU_SOURCE #include #include #include #include #include #include #include /* Open-code this -- the headers are too messy to easily use them. */ struct real_sigaction { void *handler; unsigned long flags; void *restorer; unsigned int mask[2]; }; static volatile sig_atomic_t handler_called; static void handler_with_siginfo(int sig, siginfo_t *info, void *ctx_void) { handler_called = 1; } static void handler_without_siginfo(int sig) { handler_called = 1; } int main() { int nerrs = 0; struct real_sigaction sa; memset(&sa, 0, sizeof(sa)); sa.handler = handler_with_siginfo; sa.flags = SA_SIGINFO; sa.restorer = NULL; /* request kernel-provided restorer */ if (syscall(SYS_rt_sigaction, SIGUSR1, &sa, NULL, 8) != 0) err(1, "raw rt_sigaction syscall"); raise(SIGUSR1); if (handler_called) { printf("[OK]\tSA_SIGINFO handler returned successfully\n"); } else { printf("[FAIL]\tSA_SIGINFO handler was not called\n"); nerrs++; } sa.flags = 0; sa.handler = handler_without_siginfo; if (syscall(SYS_sigaction, SIGUSR1, &sa, 0) != 0) err(1, "raw sigaction syscall"); handler_called = 0; raise(SIGUSR1); if (handler_called) { printf("[OK]\t!SA_SIGINFO handler returned successfully\n"); } else { printf("[FAIL]\t!SA_SIGINFO handler was not called\n"); nerrs++; } } esting/ktest/examples?h=nds-private-remove&id=aaaec6fc755447a1d056765b11b24d8ff2b81366'>diff
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 19:03:21 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 20:22:18 +0100
commitaaaec6fc755447a1d056765b11b24d8ff2b81366 (patch)
treea7f4167960ee1df86739905b6ccdeb95465bfe5f /tools/testing/ktest/examples
parent08d85f3ea99f1eeafc4e8507936190e86a16ee8c (diff)
x86/irq: Make irq activate operations symmetric
The recent commit which prevents double activation of interrupts unearthed interesting code in x86. The code (ab)uses irq_domain_activate_irq() to reconfigure an already activated interrupt. That trips over the prevention code now. Fix it by deactivating the interrupt before activating the new configuration. Fixes: 08d85f3ea99f1 "irqdomain: Avoid activating interrupts more than once" Reported-and-tested-by: Mike Galbraith <efault@gmx.de> Reported-and-tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701311901580.3457@nanos
Diffstat (limited to 'tools/testing/ktest/examples')