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riscv: Reset pmm when PR_TAGGED_ADDR_ENABLE is not set

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In set_tagged_addr_ctrl(), when PR_TAGGED_ADDR_ENABLE is not set, pmlen
is correctly set to 0, but it forgets to reset pmm. This results in the
CPU pmm state not corresponding to the software pmlen state.

Fix this by resetting pmm along with pmlen.

Fixes: 2e17430858 ("riscv: Add support for the tagged address ABI")
Signed-off-by: Zishun Yi <[email protected]>
Reviewed-by: Samuel Holland <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paul Walmsley <[email protected]>
This commit is contained in:
Zishun Yi authored and Paul Walmsley committed 2026-04-04 18:37:45 -06:00
1 parent 57f0253bc1
commit 3033b2b1e3
1 file changed
+3 -1
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arch/riscv/kernel/process.c
+3 -1
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@@ -347,8 +347,10 @@ long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg)
if (arg & PR_TAGGED_ADDR_ENABLE && (tagged_addr_disabled || !pmlen))
return -EINVAL;
if (!(arg & PR_TAGGED_ADDR_ENABLE))
if (!(arg & PR_TAGGED_ADDR_ENABLE)) {
pmlen = PMLEN_0;
pmm = ENVCFG_PMM_PMLEN_0;
}
if (mmap_write_lock_killable(mm))
return -EINTR;