Commit 3e91ec89 authored Aug 15, 2019 by Catalin Marinas Committed by Will Deacon Aug 20, 2019

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



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 <andreyknvl@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

parent 74585fcb

kernel/sys.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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:

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