eae30a240e
This is a complex one - `syscall` is used when people want to bypass libc and make the call directly However, this call: * Has a variable amount of arguments (up to 6, typically) * Has arguments that can be any type, (think of whatever arguments go in to the libc call, or see more details here https://syscalls.mebeim.net/?table=x86/64/x64/latest) I've tried to put in a couple tests to ensure we aren't mucking with the underlying functionality and they seem to be working.
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// RUN: %clangxx -fsanitize=realtime %s -o %t
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// RUN: %env_rtsan_opts="halt_on_error=false" %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK-RTSAN,CHECK
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// RUN: %clangxx %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s
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// UNSUPPORTED: ios
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// Intent: Ensure the `syscall` call behaves in the same way with/without the
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// sanitizer disabled
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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const char *GetTemporaryFilePath() { return "/tmp/rtsan_syscall_test.txt"; }
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void custom_assert(bool condition, const char *message) {
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if (!condition) {
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fprintf(stderr, "ASSERTION FAILED: %s\n", message);
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exit(1);
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}
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}
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class ScopedFileCleanup {
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public:
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[[nodiscard]] ScopedFileCleanup() = default;
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~ScopedFileCleanup() {
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if (access(GetTemporaryFilePath(), F_OK) != -1)
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unlink(GetTemporaryFilePath());
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}
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};
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// Apple has deprecated `syscall`, ignore that error
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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int main() [[clang::nonblocking]] {
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ScopedFileCleanup cleanup;
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{
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int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(),
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O_CREAT | O_WRONLY, 0644);
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custom_assert(fd != -1, "Failed to open file - write");
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int written = syscall(SYS_write, fd, "Hello, world!", 13);
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custom_assert(written == 13, "Failed to write to file");
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custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - write");
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}
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{
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int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(), O_RDONLY);
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custom_assert(fd != -1, "Failed to open file - read");
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char buffer[13];
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int read = syscall(SYS_read, fd, buffer, 13);
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custom_assert(read == 13, "Failed to read from file");
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custom_assert(memcmp(buffer, "Hello, world!", 13) == 0,
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"Read data does not match written data");
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custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - read");
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}
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unlink(GetTemporaryFilePath());
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printf("DONE\n");
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}
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#pragma clang diagnostic pop
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// CHECK-NOT: ASSERTION FAILED
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// CHECK-RTSAN-COUNT-6: Intercepted call to real-time unsafe function `syscall`
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// CHECK: DONE
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