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hc
2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/kernel/ptrace.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * linux/kernel/ptrace.c
34  *
....@@ -30,6 +31,8 @@
3031 #include <linux/cn_proc.h>
3132 #include <linux/compat.h>
3233 #include <linux/sched/signal.h>
34
+
35
+#include <asm/syscall.h>	/* for syscall_get_* */
3336 
3437 /*
3538  * Access another process' address space via ptrace.
....@@ -115,6 +118,9 @@
115118 	BUG_ON(!child->ptrace);
116119 
117120 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
121
+#ifdef TIF_SYSCALL_EMU
122
+	clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
123
+#endif
118124 
119125 	child->parent = child->real_parent;
120126 	list_del_init(&child->ptrace_entry);
....@@ -364,6 +370,26 @@
364370 	return !err;
365371 }
366372 
373
+static int check_ptrace_options(unsigned long data)
374
+{
375
+	if (data & ~(unsigned long)PTRACE_O_MASK)
376
+		return -EINVAL;
377
+
378
+	if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) {
379
+		if (!IS_ENABLED(CONFIG_CHECKPOINT_RESTORE) ||
380
+		    !IS_ENABLED(CONFIG_SECCOMP))
381
+			return -EINVAL;
382
+
383
+		if (!capable(CAP_SYS_ADMIN))
384
+			return -EPERM;
385
+
386
+		if (seccomp_mode(&current->seccomp) != SECCOMP_MODE_DISABLED ||
387
+		    current->ptrace & PT_SUSPEND_SECCOMP)
388
+			return -EPERM;
389
+	}
390
+	return 0;
391
+}
392
+
367393 static int ptrace_attach(struct task_struct *task, long request,
368394 			 unsigned long addr,
369395 			 unsigned long flags)
....@@ -375,8 +401,16 @@
375401 	if (seize) {
376402 		if (addr != 0)
377403 			goto out;
404
+		/*
405
+		 * This duplicates the check in check_ptrace_options() because
406
+		 * ptrace_attach() and ptrace_setoptions() have historically
407
+		 * used different error codes for unknown ptrace options.
408
+		 */
378409 		if (flags & ~(unsigned long)PTRACE_O_MASK)
379410 			goto out;
411
+		retval = check_ptrace_options(flags);
412
+		if (retval)
413
+			return retval;
380414 		flags = PT_PTRACED | PT_SEIZED | (flags << PT_OPT_FLAG_SHIFT);
381415 	} else {
382416 		flags = PT_PTRACED;
....@@ -420,7 +454,7 @@
420454 
421455 	/* SEIZE doesn't trap tracee on attach */
422456 	if (!seize)
423
-		send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
457
+		send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
424458 
425459 	spin_lock(&task->sighand->siglock);
426460 
....@@ -587,7 +621,7 @@
587621 
588622 	list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
589623 		if (unlikely(p->ptrace & PT_EXITKILL))
590
-			send_sig_info(SIGKILL, SEND_SIG_FORCED, p);
624
+			send_sig_info(SIGKILL, SEND_SIG_PRIV, p);
591625 
592626 		if (__ptrace_detach(tracer, p))
593627 			list_add(&p->ptrace_entry, dead);
....@@ -649,22 +683,11 @@
649683 static int ptrace_setoptions(struct task_struct *child, unsigned long data)
650684 {
651685 	unsigned flags;
686
+	int ret;
652687 
653
-	if (data & ~(unsigned long)PTRACE_O_MASK)
654
-		return -EINVAL;
655
-
656
-	if (unlikely(data & PTRACE_O_SUSPEND_SECCOMP)) {
657
-		if (!IS_ENABLED(CONFIG_CHECKPOINT_RESTORE) ||
658
-		    !IS_ENABLED(CONFIG_SECCOMP))
659
-			return -EINVAL;
660
-
661
-		if (!capable(CAP_SYS_ADMIN))
662
-			return -EPERM;
663
-
664
-		if (seccomp_mode(&current->seccomp) != SECCOMP_MODE_DISABLED ||
665
-		    current->ptrace & PT_SUSPEND_SECCOMP)
666
-			return -EPERM;
667
-	}
688
+	ret = check_ptrace_options(data);
689
+	if (ret)
690
+		return ret;
668691 
669692 	/* Avoid intermediate state when all opts are cleared */
670693 	flags = child->ptrace;
....@@ -675,7 +698,7 @@
675698 	return 0;
676699 }
677700 
678
-static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
701
+static int ptrace_getsiginfo(struct task_struct *child, kernel_siginfo_t *info)
679702 {
680703 	unsigned long flags;
681704 	int error = -ESRCH;
....@@ -691,7 +714,7 @@
691714 	return error;
692715 }
693716 
694
-static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
717
+static int ptrace_setsiginfo(struct task_struct *child, const kernel_siginfo_t *info)
695718 {
696719 	unsigned long flags;
697720 	int error = -ESRCH;
....@@ -737,7 +760,7 @@
737760 		pending = &child->pending;
738761 
739762 	for (i = 0; i < arg.nr; ) {
740
-		siginfo_t info;
763
+		kernel_siginfo_t info;
741764 		unsigned long off = arg.off + i;
742765 		bool found = false;
743766 
....@@ -908,14 +931,107 @@
908931  * to ensure no machine forgets it.
909932  */
910933 EXPORT_SYMBOL_GPL(task_user_regset_view);
911
-#endif
934
+
935
+static unsigned long
936
+ptrace_get_syscall_info_entry(struct task_struct *child, struct pt_regs *regs,
937
+			      struct ptrace_syscall_info *info)
938
+{
939
+	unsigned long args[ARRAY_SIZE(info->entry.args)];
940
+	int i;
941
+
942
+	info->op = PTRACE_SYSCALL_INFO_ENTRY;
943
+	info->entry.nr = syscall_get_nr(child, regs);
944
+	syscall_get_arguments(child, regs, args);
945
+	for (i = 0; i < ARRAY_SIZE(args); i++)
946
+		info->entry.args[i] = args[i];
947
+
948
+	/* args is the last field in struct ptrace_syscall_info.entry */
949
+	return offsetofend(struct ptrace_syscall_info, entry.args);
950
+}
951
+
952
+static unsigned long
953
+ptrace_get_syscall_info_seccomp(struct task_struct *child, struct pt_regs *regs,
954
+				struct ptrace_syscall_info *info)
955
+{
956
+	/*
957
+	 * As struct ptrace_syscall_info.entry is currently a subset
958
+	 * of struct ptrace_syscall_info.seccomp, it makes sense to
959
+	 * initialize that subset using ptrace_get_syscall_info_entry().
960
+	 * This can be reconsidered in the future if these structures
961
+	 * diverge significantly enough.
962
+	 */
963
+	ptrace_get_syscall_info_entry(child, regs, info);
964
+	info->op = PTRACE_SYSCALL_INFO_SECCOMP;
965
+	info->seccomp.ret_data = child->ptrace_message;
966
+
967
+	/* ret_data is the last field in struct ptrace_syscall_info.seccomp */
968
+	return offsetofend(struct ptrace_syscall_info, seccomp.ret_data);
969
+}
970
+
971
+static unsigned long
972
+ptrace_get_syscall_info_exit(struct task_struct *child, struct pt_regs *regs,
973
+			     struct ptrace_syscall_info *info)
974
+{
975
+	info->op = PTRACE_SYSCALL_INFO_EXIT;
976
+	info->exit.rval = syscall_get_error(child, regs);
977
+	info->exit.is_error = !!info->exit.rval;
978
+	if (!info->exit.is_error)
979
+		info->exit.rval = syscall_get_return_value(child, regs);
980
+
981
+	/* is_error is the last field in struct ptrace_syscall_info.exit */
982
+	return offsetofend(struct ptrace_syscall_info, exit.is_error);
983
+}
984
+
985
+static int
986
+ptrace_get_syscall_info(struct task_struct *child, unsigned long user_size,
987
+			void __user *datavp)
988
+{
989
+	struct pt_regs *regs = task_pt_regs(child);
990
+	struct ptrace_syscall_info info = {
991
+		.op = PTRACE_SYSCALL_INFO_NONE,
992
+		.arch = syscall_get_arch(child),
993
+		.instruction_pointer = instruction_pointer(regs),
994
+		.stack_pointer = user_stack_pointer(regs),
995
+	};
996
+	unsigned long actual_size = offsetof(struct ptrace_syscall_info, entry);
997
+	unsigned long write_size;
998
+
999
+	/*
1000
+	 * This does not need lock_task_sighand() to access
1001
+	 * child->last_siginfo because ptrace_freeze_traced()
1002
+	 * called earlier by ptrace_check_attach() ensures that
1003
+	 * the tracee cannot go away and clear its last_siginfo.
1004
+	 */
1005
+	switch (child->last_siginfo ? child->last_siginfo->si_code : 0) {
1006
+	case SIGTRAP | 0x80:
1007
+		switch (child->ptrace_message) {
1008
+		case PTRACE_EVENTMSG_SYSCALL_ENTRY:
1009
+			actual_size = ptrace_get_syscall_info_entry(child, regs,
1010
+								    &info);
1011
+			break;
1012
+		case PTRACE_EVENTMSG_SYSCALL_EXIT:
1013
+			actual_size = ptrace_get_syscall_info_exit(child, regs,
1014
+								   &info);
1015
+			break;
1016
+		}
1017
+		break;
1018
+	case SIGTRAP | (PTRACE_EVENT_SECCOMP << 8):
1019
+		actual_size = ptrace_get_syscall_info_seccomp(child, regs,
1020
+							      &info);
1021
+		break;
1022
+	}
1023
+
1024
+	write_size = min(actual_size, user_size);
1025
+	return copy_to_user(datavp, &info, write_size) ? -EFAULT : actual_size;
1026
+}
1027
+#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
9121028 
9131029 int ptrace_request(struct task_struct *child, long request,
9141030 		   unsigned long addr, unsigned long data)
9151031 {
9161032 	bool seized = child->ptrace & PT_SEIZED;
9171033 	int ret = -EIO;
918
-	siginfo_t siginfo, *si;
1034
+	kernel_siginfo_t siginfo, *si;
9191035 	void __user *datavp = (void __user *) data;
9201036 	unsigned long __user *datalp = datavp;
9211037 	unsigned long flags;
....@@ -949,9 +1065,8 @@
9491065 		break;
9501066 
9511067 	case PTRACE_SETSIGINFO:
952
-		if (copy_from_user(&siginfo, datavp, sizeof siginfo))
953
-			ret = -EFAULT;
954
-		else
1068
+		ret = copy_siginfo_from_user(&siginfo, datavp);
1069
+		if (!ret)
9551070 			ret = ptrace_setsiginfo(child, &siginfo);
9561071 		break;
9571072 
....@@ -1104,9 +1219,8 @@
11041219 		return ptrace_resume(child, request, data);
11051220 
11061221 	case PTRACE_KILL:
1107
-		if (child->exit_state)	/* already dead */
1108
-			return 0;
1109
-		return ptrace_resume(child, request, SIGKILL);
1222
+		send_sig_info(SIGKILL, SEND_SIG_NOINFO, child);
1223
+		return 0;
11101224 
11111225 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
11121226 	case PTRACE_GETREGSET:
....@@ -1114,7 +1228,7 @@
11141228 		struct iovec kiov;
11151229 		struct iovec __user *uiov = datavp;
11161230 
1117
-		if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
1231
+		if (!access_ok(uiov, sizeof(*uiov)))
11181232 			return -EFAULT;
11191233 
11201234 		if (__get_user(kiov.iov_base, &uiov->iov_base) ||
....@@ -1126,6 +1240,10 @@
11261240 			ret = __put_user(kiov.iov_len, &uiov->iov_len);
11271241 		break;
11281242 	}
1243
+
1244
+	case PTRACE_GET_SYSCALL_INFO:
1245
+		ret = ptrace_get_syscall_info(child, addr, datavp);
1246
+		break;
11291247 #endif
11301248 
11311249 	case PTRACE_SECCOMP_GET_FILTER:
....@@ -1221,7 +1339,7 @@
12211339 {
12221340 	compat_ulong_t __user *datap = compat_ptr(data);
12231341 	compat_ulong_t word;
1224
-	siginfo_t siginfo;
1342
+	kernel_siginfo_t siginfo;
12251343 	int ret;
12261344 
12271345 	switch (request) {
....@@ -1255,10 +1373,9 @@
12551373 		break;
12561374 
12571375 	case PTRACE_SETSIGINFO:
1258
-		if (copy_siginfo_from_user32(
1259
-			    &siginfo, (struct compat_siginfo __user *) datap))
1260
-			ret = -EFAULT;
1261
-		else
1376
+		ret = copy_siginfo_from_user32(
1377
+			&siginfo, (struct compat_siginfo __user *) datap);
1378
+		if (!ret)
12621379 			ret = ptrace_setsiginfo(child, &siginfo);
12631380 		break;
12641381 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
....@@ -1271,7 +1388,7 @@
12711388 		compat_uptr_t ptr;
12721389 		compat_size_t len;
12731390 
1274
-		if (!access_ok(VERIFY_WRITE, uiov, sizeof(*uiov)))
1391
+		if (!access_ok(uiov, sizeof(*uiov)))
12751392 			return -EFAULT;
12761393 
12771394 		if (__get_user(ptr, &uiov->iov_base) ||