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

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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: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/Iefbea66cf7d2b4c80b82f9639b9ea7f33f7fac53
Fixes: af5ce95282 ("arm64: mte: Allow user control of the generated random tags via prctl()")
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20201203075110.2781021-1-pcc@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Peter Collingbourne 2020-12-02 23:51:10 -08:00 committed by Will Deacon
parent 9e5344e0ff
commit 929c1f3384
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kernel/mte.c
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@ -189,7 +189,8 @@ long get_mte_ctrl(struct task_struct *task)
switch (task->thread.sctlr_tcf0) { switch (task->thread.sctlr_tcf0) {
case SCTLR_EL1_TCF0_NONE: case SCTLR_EL1_TCF0_NONE:
return PR_MTE_TCF_NONE; ret |= PR_MTE_TCF_NONE;
break;
case SCTLR_EL1_TCF0_SYNC: case SCTLR_EL1_TCF0_SYNC:
ret |= PR_MTE_TCF_SYNC; ret |= PR_MTE_TCF_SYNC;
break; break;