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| author | Catalin Marinas <catalin.marinas@arm.com> | 2020-07-03 14:25:50 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-09-04 12:46:07 +0100 |
| commit | 93f067f6caf5941cc730e99ce72042304e0e6ff5 (patch) | |
| tree | 9909eeb3f842bbcb594976c7d02967c783f3ee03 /arch/arm64/kernel/mte.c | |
| parent | 39d08e8318c49c5fd2bda9cadfd2bc54d2d3dfd8 (diff) | |
| download | linux-stable-93f067f6caf5941cc730e99ce72042304e0e6ff5.tar.gz linux-stable-93f067f6caf5941cc730e99ce72042304e0e6ff5.tar.bz2 linux-stable-93f067f6caf5941cc730e99ce72042304e0e6ff5.zip | |
arm64: mte: Allow {set,get}_tagged_addr_ctrl() on non-current tasks
In preparation for ptrace() access to the prctl() value, allow calling
these functions on non-current tasks.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/mte.c')
| -rw-r--r-- | arch/arm64/kernel/mte.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 09cf76fc1090..e80c49af74af 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -124,9 +124,10 @@ void mte_suspend_exit(void) update_gcr_el1_excl(current->thread.gcr_user_incl); } -long set_mte_ctrl(unsigned long arg) +long set_mte_ctrl(struct task_struct *task, unsigned long arg) { u64 tcf0; + u64 gcr_incl = (arg & PR_MTE_TAG_MASK) >> PR_MTE_TAG_SHIFT; if (!system_supports_mte()) return 0; @@ -145,22 +146,27 @@ long set_mte_ctrl(unsigned long arg) return -EINVAL; } - set_sctlr_el1_tcf0(tcf0); - set_gcr_el1_excl((arg & PR_MTE_TAG_MASK) >> PR_MTE_TAG_SHIFT); + if (task != current) { + task->thread.sctlr_tcf0 = tcf0; + task->thread.gcr_user_incl = gcr_incl; + } else { + set_sctlr_el1_tcf0(tcf0); + set_gcr_el1_excl(gcr_incl); + } return 0; } -long get_mte_ctrl(void) +long get_mte_ctrl(struct task_struct *task) { unsigned long ret; if (!system_supports_mte()) return 0; - ret = current->thread.gcr_user_incl << PR_MTE_TAG_SHIFT; + ret = task->thread.gcr_user_incl << PR_MTE_TAG_SHIFT; - switch (current->thread.sctlr_tcf0) { + switch (task->thread.sctlr_tcf0) { case SCTLR_EL1_TCF0_NONE: return PR_MTE_TCF_NONE; case SCTLR_EL1_TCF0_SYNC: |