arm64: Tighten the PR_{SET, GET}_TAGGED_ADDR_CTRL prctl() unused argu…

…ments Require that arg{3,4,5} of the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl and arg2 of the PR_GET_TAGGED_ADDR_CTRL prctl() are zero rather than ignored for future extensions. Acked-by: Andrey Konovalov <[email protected]> Signed-off-by: Catalin Marinas <[email protected]> Signed-off-by: Will Deacon <[email protected]>
devinus · Aug 20, 2019 · 3e91ec8 · 3e91ec8
1 parent 74585fc
commit 3e91ec8
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/kernel/sys.c b/kernel/sys.c
@@ -2499,9 +2499,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 		error = PAC_RESET_KEYS(me, arg2);
 		break;
 	case PR_SET_TAGGED_ADDR_CTRL:
+		if (arg3 || arg4 || arg5)
+			return -EINVAL;
 		error = SET_TAGGED_ADDR_CTRL(arg2);
 		break;
 	case PR_GET_TAGGED_ADDR_CTRL:
+		if (arg2 || arg3 || arg4 || arg5)
+			return -EINVAL;
 		error = GET_TAGGED_ADDR_CTRL();
 		break;
 	default: