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From: Igor Munkin via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Sergey Kaplun <skaplun@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH luajit] Fix IR_BUFPUT assembly.
Date: Thu, 22 Jul 2021 10:51:58 +0300	[thread overview]
Message-ID: <20210722075158.GK11494@tarantool.org> (raw)
In-Reply-To: <20210712120652.23695-1-skaplun@tarantool.org>

Sergey,

I've checked the patch into all long-term branches in tarantool/luajit
and bumped a new version in 1.10, 2.7, 2.8 and master.

On 12.07.21, Sergey Kaplun wrote:
> From: Mike Pall <mike>
> 
> Thanks to Peter Cawley.
> 
> (cherry picked from commit 58d0dde0a2df49abc991decbabff15230010829a)
> 
> When recording IR_BUFPTR special variable holds -1 value to mark that
> argument to store is not a single character. If it is, then it can be
> stored in a register directly. When storing a single character we store
> it in the aforementioned variable first to reset the -1 value. But when
> the system has signed characters, and the character to store equals
> \255, the check that the variable still holds -1 value becomes false
> positive and either wrong value is stored or the LuaJIT crashes.
> 
> This patch changes the flag value to -129 to avoid intersections with
> any `char` values.
> 
> Sergey Kaplun:
> * added the description and the test for the problem
> ---
> 
> The patch fixes the problem described in TNT-142.
> 
> Tarantool branch: https://github.com/tarantool/tarantool/tree/skaplun/lj-375-fix-ir-bufput
> Branch: https://github.com/tarantool/luajit/tree/skaplun/lj-375-fix-ir-bufput
> Issue: https://github.com/LuaJIT/LuaJIT/issues/375
> 
>  src/lj_asm.c                                    |  6 +++---
>  .../lj-375-ir-bufput-signed-char.test.lua       | 17 +++++++++++++++++
>  2 files changed, 20 insertions(+), 3 deletions(-)
>  create mode 100644 test/tarantool-tests/lj-375-ir-bufput-signed-char.test.lua
> 

<snipped>

> -- 
> 2.31.0
> 

-- 
Best regards,
IM

      parent reply	other threads:[~2021-07-22  8:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 12:06 Sergey Kaplun via Tarantool-patches
2021-07-19 22:25 ` Igor Munkin via Tarantool-patches
2021-07-20 12:17   ` Sergey Kaplun via Tarantool-patches
2021-07-21  9:30     ` Sergey Kaplun via Tarantool-patches
2021-07-20 15:22 ` Sergey Ostanevich via Tarantool-patches
2021-07-22  7:51 ` Igor Munkin via Tarantool-patches [this message]

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