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95 lines
2.2 KiB
95 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* vdso_restorer.c - tests vDSO-based signal restore |
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* Copyright (c) 2015 Andrew Lutomirski |
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* |
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* This makes sure that sa_restorer == NULL keeps working on 32-bit |
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* configurations. Modern glibc doesn't use it under any circumstances, |
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* so it's easy to overlook breakage. |
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* |
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* 64-bit userspace has never supported sa_restorer == NULL, so this is |
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* 32-bit only. |
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*/ |
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#define _GNU_SOURCE |
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#include <err.h> |
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#include <stdio.h> |
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#include <dlfcn.h> |
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#include <string.h> |
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#include <signal.h> |
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#include <unistd.h> |
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#include <syscall.h> |
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#include <sys/syscall.h> |
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/* Open-code this -- the headers are too messy to easily use them. */ |
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struct real_sigaction { |
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void *handler; |
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unsigned long flags; |
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void *restorer; |
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unsigned int mask[2]; |
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}; |
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static volatile sig_atomic_t handler_called; |
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static void handler_with_siginfo(int sig, siginfo_t *info, void *ctx_void) |
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{ |
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handler_called = 1; |
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} |
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static void handler_without_siginfo(int sig) |
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{ |
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handler_called = 1; |
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} |
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int main() |
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{ |
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int nerrs = 0; |
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struct real_sigaction sa; |
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void *vdso = dlopen("linux-vdso.so.1", |
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); |
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if (!vdso) |
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vdso = dlopen("linux-gate.so.1", |
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); |
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if (!vdso) { |
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printf("[SKIP]\tFailed to find vDSO. Tests are not expected to work.\n"); |
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return 0; |
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} |
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memset(&sa, 0, sizeof(sa)); |
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sa.handler = handler_with_siginfo; |
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sa.flags = SA_SIGINFO; |
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sa.restorer = NULL; /* request kernel-provided restorer */ |
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printf("[RUN]\tRaise a signal, SA_SIGINFO, sa.restorer == NULL\n"); |
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if (syscall(SYS_rt_sigaction, SIGUSR1, &sa, NULL, 8) != 0) |
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err(1, "raw rt_sigaction syscall"); |
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raise(SIGUSR1); |
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if (handler_called) { |
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printf("[OK]\tSA_SIGINFO handler returned successfully\n"); |
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} else { |
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printf("[FAIL]\tSA_SIGINFO handler was not called\n"); |
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nerrs++; |
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} |
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printf("[RUN]\tRaise a signal, !SA_SIGINFO, sa.restorer == NULL\n"); |
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sa.flags = 0; |
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sa.handler = handler_without_siginfo; |
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if (syscall(SYS_sigaction, SIGUSR1, &sa, 0) != 0) |
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err(1, "raw sigaction syscall"); |
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handler_called = 0; |
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raise(SIGUSR1); |
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if (handler_called) { |
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printf("[OK]\t!SA_SIGINFO handler returned successfully\n"); |
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} else { |
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printf("[FAIL]\t!SA_SIGINFO handler was not called\n"); |
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nerrs++; |
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} |
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}
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