add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/tools/testing/selftests/x86/test_vsyscall.c
..
..
@@ -18,6 +18,9 @@
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 #include <sched.h>
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 #include <stdbool.h>
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 #include <setjmp.h>
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+#include <sys/uio.h>
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+
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+#include "helpers.h"
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24
 
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 #ifdef __x86_64__
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 # define VSYS(x) (x)
..
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@@ -49,21 +52,21 @@
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 }
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 /* vsyscalls and vDSO */
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-bool should_read_vsyscall = false;
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+bool vsyscall_map_r = false, vsyscall_map_x = false;
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56
 
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 typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
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-gtod_t vgtod = (gtod_t)VSYS(0xffffffffff600000);
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+const gtod_t vgtod = (gtod_t)VSYS(0xffffffffff600000);
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 gtod_t vdso_gtod;
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60
 
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 typedef int (*vgettime_t)(clockid_t, struct timespec *);
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 vgettime_t vdso_gettime;
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63
 
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 typedef long (*time_func_t)(time_t *t);
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-time_func_t vtime = (time_func_t)VSYS(0xffffffffff600400);
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+const time_func_t vtime = (time_func_t)VSYS(0xffffffffff600400);
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 time_func_t vdso_time;
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67
 
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 typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
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-getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
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+const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
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 getcpu_t vdso_getcpu;
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71
 
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 static void init_vdso(void)
..
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@@ -107,7 +110,7 @@
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 	maps = fopen("/proc/self/maps", "r");
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 	if (!maps) {
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 		printf("[WARN]\tCould not open /proc/self/maps -- assuming vsyscall is r-x\n");
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-		should_read_vsyscall = true;
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+		vsyscall_map_r = true;
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 		return 0;
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 	}
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..
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@@ -133,12 +136,8 @@
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 		}
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 		printf("\tvsyscall permissions are %c-%c\n", r, x);
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-		should_read_vsyscall = (r == 'r');
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-		if (x != 'x') {
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-			vgtod = NULL;
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-			vtime = NULL;
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-			vgetcpu = NULL;
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-		}
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+		vsyscall_map_r = (r == 'r');
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+		vsyscall_map_x = (x == 'x');
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 		found = true;
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 		break;
..
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@@ -148,10 +147,8 @@
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 	if (!found) {
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 		printf("\tno vsyscall map in /proc/self/maps\n");
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-		should_read_vsyscall = false;
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-		vgtod = NULL;
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-		vtime = NULL;
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-		vgetcpu = NULL;
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+		vsyscall_map_r = false;
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+		vsyscall_map_x = false;
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 	}
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 	return nerrs;
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@@ -183,9 +180,13 @@
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 }
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 static jmp_buf jmpbuf;
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+static volatile unsigned long segv_err;
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184
 
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 static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
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 {
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+	ucontext_t *ctx = (ucontext_t *)ctx_void;
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+
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+	segv_err =  ctx->uc_mcontext.gregs[REG_ERR];
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 	siglongjmp(jmpbuf, 1);
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 }
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@@ -238,7 +239,7 @@
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 		err(1, "syscall gettimeofday");
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 	if (vdso_gtod)
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 		ret_vdso = vdso_gtod(&tv_vdso, &tz_vdso);
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-	if (vgtod)
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+	if (vsyscall_map_x)
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 		ret_vsys = vgtod(&tv_vsys, &tz_vsys);
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 	if (sys_gtod(&tv_sys2, &tz_sys) != 0)
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 		err(1, "syscall gettimeofday");
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@@ -252,7 +253,7 @@
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 		}
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 	}
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-	if (vgtod) {
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+	if (vsyscall_map_x) {
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 		if (ret_vsys == 0) {
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 			nerrs += check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vsyscall", &tv_vsys, &tz_vsys);
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 		} else {
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@@ -273,7 +274,7 @@
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 	t_sys1 = sys_time(&t2_sys1);
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 	if (vdso_time)
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 		t_vdso = vdso_time(&t2_vdso);
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-	if (vtime)
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+	if (vsyscall_map_x)
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 		t_vsys = vtime(&t2_vsys);
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 	t_sys2 = sys_time(&t2_sys2);
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 	if (t_sys1 < 0 || t_sys1 != t2_sys1 || t_sys2 < 0 || t_sys2 != t2_sys2) {
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@@ -294,7 +295,7 @@
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 		}
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 	}
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-	if (vtime) {
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+	if (vsyscall_map_x) {
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 		if (t_vsys < 0 || t_vsys != t2_vsys) {
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 			printf("[FAIL]\tvsyscall failed (ret:%ld output:%ld)\n", t_vsys, t2_vsys);
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 			nerrs++;
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@@ -330,7 +331,7 @@
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 	ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
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 	if (vdso_getcpu)
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 		ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
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-	if (vgetcpu)
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+	if (vsyscall_map_x)
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 		ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
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 	if (ret_sys == 0) {
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@@ -369,7 +370,7 @@
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 		}
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 	}
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372
-	if (vgetcpu) {
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+	if (vsyscall_map_x) {
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 		if (ret_vsys) {
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 			printf("[FAIL]\tvsyscall getcpu() failed\n");
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 			nerrs++;
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@@ -410,36 +411,109 @@
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 		can_read = false;
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 	}
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-	if (can_read && !should_read_vsyscall) {
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+	if (can_read && !vsyscall_map_r) {
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 		printf("[FAIL]\tWe have read access, but we shouldn't\n");
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 		return 1;
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-	} else if (!can_read && should_read_vsyscall) {
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+	} else if (!can_read && vsyscall_map_r) {
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 		printf("[FAIL]\tWe don't have read access, but we should\n");
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 		return 1;
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+	} else if (can_read) {
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+		printf("[OK]\tWe have read access\n");
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 	} else {
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-		printf("[OK]\tgot expected result\n");
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+		printf("[OK]\tWe do not have read access: #PF(0x%lx)\n",
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+		       segv_err);
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 	}
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426
 #endif
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427
 
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 	return 0;
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 }
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+static int test_vsys_x(void)
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+{
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+#ifdef __x86_64__
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+	if (vsyscall_map_x) {
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+		/* We already tested this adequately. */
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+		return 0;
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+	}
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+
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+	printf("[RUN]\tMake sure that vsyscalls really page fault\n");
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+
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+	bool can_exec;
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+	if (sigsetjmp(jmpbuf, 1) == 0) {
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+		vgtod(NULL, NULL);
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+		can_exec = true;
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+	} else {
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+		can_exec = false;
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+	}
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+
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+	if (can_exec) {
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+		printf("[FAIL]\tExecuting the vsyscall did not page fault\n");
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+		return 1;
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+	} else if (segv_err & (1 << 4)) { /* INSTR */
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+		printf("[OK]\tExecuting the vsyscall page failed: #PF(0x%lx)\n",
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+		       segv_err);
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+	} else {
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+		printf("[FAIL]\tExecution failed with the wrong error: #PF(0x%lx)\n",
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+		       segv_err);
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+		return 1;
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+	}
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+#endif
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+
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+	return 0;
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+}
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+
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+/*
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+ * Debuggers expect ptrace() to be able to peek at the vsyscall page.
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+ * Use process_vm_readv() as a proxy for ptrace() to test this.  We
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+ * want it to work in the vsyscall=emulate case and to fail in the
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+ * vsyscall=xonly case.
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+ *
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+ * It's worth noting that this ABI is a bit nutty.  write(2) can't
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+ * read from the vsyscall page on any kernel version or mode.  The
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+ * fact that ptrace() ever worked was a nice courtesy of old kernels,
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+ * but the code to support it is fairly gross.
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+ */
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+static int test_process_vm_readv(void)
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+{
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+#ifdef __x86_64__
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+	char buf[4096];
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+	struct iovec local, remote;
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+	int ret;
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+
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+	printf("[RUN]\tprocess_vm_readv() from vsyscall page\n");
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+
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+	local.iov_base = buf;
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+	local.iov_len = 4096;
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+	remote.iov_base = (void *)0xffffffffff600000;
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+	remote.iov_len = 4096;
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+	ret = process_vm_readv(getpid(), &local, 1, &remote, 1, 0);
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+	if (ret != 4096) {
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+		/*
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+		 * We expect process_vm_readv() to work if and only if the
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+		 * vsyscall page is readable.
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+		 */
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+		printf("[%s]\tprocess_vm_readv() failed (ret = %d, errno = %d)\n", vsyscall_map_r ? "FAIL" : "OK", ret, errno);
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+		return vsyscall_map_r ? 1 : 0;
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+	}
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+
499
+	if (vsyscall_map_r) {
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+		if (!memcmp(buf, remote.iov_base, sizeof(buf))) {
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+			printf("[OK]\tIt worked and read correct data\n");
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+		} else {
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+			printf("[FAIL]\tIt worked but returned incorrect data\n");
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+			return 1;
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+		}
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+	} else {
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+		printf("[FAIL]\tprocess_rm_readv() succeeded, but it should have failed in this configuration\n");
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+		return 1;
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+	}
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+#endif
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+
512
+	return 0;
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+}
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 #ifdef __x86_64__
429
-#define X86_EFLAGS_TF (1UL << 8)
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 static volatile sig_atomic_t num_vsyscall_traps;
431
-
432
-static unsigned long get_eflags(void)
433
-{
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-	unsigned long eflags;
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-	asm volatile ("pushfq\n\tpopq %0" : "=rm" (eflags));
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-	return eflags;
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-}
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-
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-static void set_eflags(unsigned long eflags)
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-{
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-	asm volatile ("pushq %0\n\tpopfq" : : "rm" (eflags) : "flags");
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-}
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517
 
444
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 static void sigtrap(int sig, siginfo_t *info, void *ctx_void)
445
519
 {
..
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@@ -455,7 +529,7 @@
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 	time_t tmp;
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 	bool is_native;
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531
 
458
-	if (!vtime)
532
+	if (!vsyscall_map_x)
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 		return 0;
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534
 
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 	printf("[RUN]\tchecking that vsyscalls are emulated\n");
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@@ -497,6 +571,9 @@
497
571
 
498
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 	sethandler(SIGSEGV, sigsegv, 0);
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 	nerrs += test_vsys_r();
574
+	nerrs += test_vsys_x();
575
+
576
+	nerrs += test_process_vm_readv();
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501
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 #ifdef __x86_64__
502
579
 	nerrs += test_emulation();