Commit 929c1f33 authored by Peter Collingbourne's avatar Peter Collingbourne Committed by Will Deacon
Browse files

arm64: mte: fix prctl(PR_GET_TAGGED_ADDR_CTRL) if TCF0=NONE 



Previously we were always returning a tag inclusion mask of zero via
PR_GET_TAGGED_ADDR_CTRL if TCF0 was set to NONE. Fix it by making
the code for the NONE case match the others.

Signed-off-by: default avatarPeter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/Iefbea66cf7d2b4c80b82f9639b9ea7f33f7fac53


Fixes: af5ce952 ("arm64: mte: Allow user control of the generated random tags via prctl()")
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20201203075110.2781021-1-pcc@google.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 9e5344e0

arch/arm64/kernel/mte.c

+2 −1
Original line number Diff line number Diff line
@@ -189,7 +189,8 @@ long get_mte_ctrl(struct task_struct *task) 


	switch (task->thread.sctlr_tcf0) {

	case SCTLR_EL1_TCF0_NONE:

		return PR_MTE_TCF_NONE;

		ret |= PR_MTE_TCF_NONE;

		break;

	case SCTLR_EL1_TCF0_SYNC:

		ret |= PR_MTE_TCF_SYNC;

		break;