selftests/x86: Add a test for process_vm_readv() on the vsyscall page (7f0a5e07) · Commits · 戴 / test

tools/testing/selftests/x86/test_vsyscall.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@
		#include <sched.h>
		#include <stdbool.h>
		#include <setjmp.h>
		#include <sys/uio.h>

		#ifdef __x86_64__
		# define VSYS(x) (x)
		@@ -459,6 +460,38 @@ static int test_vsys_x(void)
		return 0;
		}

		static int test_process_vm_readv(void)
		{
		#ifdef __x86_64__
		char buf[4096];
		struct iovec local, remote;
		int ret;

		printf("[RUN]\tprocess_vm_readv() from vsyscall page\n");

		local.iov_base = buf;
		local.iov_len = 4096;
		remote.iov_base = (void *)0xffffffffff600000;
		remote.iov_len = 4096;
		ret = process_vm_readv(getpid(), &local, 1, &remote, 1, 0);
		if (ret != 4096) {
		printf("[OK]\tprocess_vm_readv() failed (ret = %d, errno = %d)\n", ret, errno);
		return 0;
		}

		if (vsyscall_map_r) {
		if (!memcmp(buf, (const void *)0xffffffffff600000, 4096)) {
		printf("[OK]\tIt worked and read correct data\n");
		} else {
		printf("[FAIL]\tIt worked but returned incorrect data\n");
		return 1;
		}
		}
		#endif

		return 0;
		}

		#ifdef __x86_64__
		#define X86_EFLAGS_TF (1UL << 8)
		static volatile sig_atomic_t num_vsyscall_traps;
		@@ -533,6 +566,8 @@ int main(int argc, char **argv)
		nerrs += test_vsys_r();
		nerrs += test_vsys_x();

		nerrs += test_process_vm_readv();

		#ifdef __x86_64__
		nerrs += test_emulation();
		#endif