Commit 75443b70 authored Aug 15, 2019 by Catalin Marinas Committed by Alistair Delva Oct 07, 2019

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



(Upstream commit 3e91ec89f527b9870fe42dcbdb74fd389d123a95).

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>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Bug: 135692346
Change-Id: I8bb5c3eb4728440880c971d77904f7e45b571ddc

parent 58f10ec3

kernel/sys.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2635,9 +2635,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
		error = prctl_set_vma(arg2, arg3, arg4, arg5);
		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: