Blame SOURCES/lua-5.4-CVE-2022-28805.patch
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From 1f3c6f4534c6411313361697d98d1145a1f030fa Mon Sep 17 00:00:00 2001
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From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
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Date: Tue, 15 Feb 2022 12:28:46 -0300
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Subject: [PATCH] Bug: Lua can generate wrong code when _ENV is <const>
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---
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lparser.c | 1 +
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testes/attrib.lua | 10 ++++++++++
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2 files changed, 11 insertions(+)
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diff --git a/lparser.c b/lparser.c
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index 3abe3d751..a5cd55257 100644
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--- a/src/lparser.c
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+++ b/src/lparser.c
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@@ -468,6 +468,7 @@ static void singlevar (LexState *ls, expdesc *var) {
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expdesc key;
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singlevaraux(fs, ls->envn, var, 1); /* get environment variable */
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lua_assert(var->k != VVOID); /* this one must exist */
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+ luaK_exp2anyregup(fs, var); /* but could be a constant */
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codestring(&key, varname); /* key is variable name */
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luaK_indexed(fs, var, &key); /* env[varname] */
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}
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