linux-kernel - Re: [PATCH] riscv: Disallow PR_GET_TAGGED_ADDR

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Message-Id: 
 <174672312824.2976395.79446860575493569.git-patchwork-notify@kernel.org>
Date: Thu, 08 May 2025 16:52:08 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Samuel Holland <samuel.holland@...ive.com>
Cc: linux-riscv@...ts.infradead.org, alex@...ti.fr, palmer@...belt.com,
 aou@...s.berkeley.edu, bodonnel@...hat.com, charlie@...osinc.com,
 conor.dooley@...rochip.com, joel.granados@...nel.org,
 paul.walmsley@...ive.com, cuiyunhui@...edance.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: Disallow PR_GET_TAGGED_ADDR_CTRL without Supm

Hello:

This patch was applied to riscv/linux.git (fixes)
by Alexandre Ghiti <alexghiti@...osinc.com>:

On Wed,  7 May 2025 07:52:18 -0700 you wrote:
> When the prctl() interface for pointer masking was added, it did not
> check that the pointer masking ISA extension was supported, only the
> individual submodes. Userspace could still attempt to disable pointer
> masking and query the pointer masking state. commit 81de1afb2dd1
> ("riscv: Fix kernel crash due to PR_SET_TAGGED_ADDR_CTRL") disallowed
> the former, as the senvcfg write could crash on older systems.
> PR_GET_TAGGED_ADDR_CTRL state does not crash, because it reads only
> kernel-internal state and not senvcfg, but it should still be disallowed
> for consistency.
> 
> [...]

Here is the summary with links:
  - riscv: Disallow PR_GET_TAGGED_ADDR_CTRL without Supm
    https://git.kernel.org/riscv/c/7f1c3de1370b

You are awesome, thank you!
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