forked from pool/lua54
cc801642b3
- Added more numbered patches from upstream: * luabugs11.patch OBS-URL: https://build.opensuse.org/request/show/1077315 OBS-URL: https://build.opensuse.org/package/show/devel:languages:lua/lua54?expand=0&rev=70
78 lines
2.3 KiB
Diff
78 lines
2.3 KiB
Diff
From ab859fe59b464a038a45552921cb2b23892343af Mon Sep 17 00:00:00 2001
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From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
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Date: Fri, 17 Mar 2023 15:52:09 -0300
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Subject: [PATCH] Bug: Loading a corrupted binary file can segfault
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The size of the list of upvalue names are stored separated from the
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size of the list of upvalues, but they share the same array.
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---
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ldump.c | 8 ++++++--
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lundump.c | 2 ++
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testes/calls.lua | 14 ++++++++++++++
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3 files changed, 22 insertions(+), 2 deletions(-)
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diff --git a/ldump.c b/ldump.c
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index f848b669c..f231691b7 100644
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--- a/src/ldump.c
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+++ b/src/ldump.c
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@@ -10,6 +10,7 @@
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#include "lprefix.h"
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+#include <limits.h>
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#include <stddef.h>
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#include "lua.h"
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@@ -55,8 +56,11 @@ static void dumpByte (DumpState *D, int y) {
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}
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-/* dumpInt Buff Size */
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-#define DIBS ((sizeof(size_t) * 8 / 7) + 1)
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+/*
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+** 'dumpSize' buffer size: each byte can store up to 7 bits. (The "+6"
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+** rounds up the division.)
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+*/
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+#define DIBS ((sizeof(size_t) * CHAR_BIT + 6) / 7)
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static void dumpSize (DumpState *D, size_t x) {
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lu_byte buff[DIBS];
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diff --git a/lundump.c b/lundump.c
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index aba93f828..02aed64fb 100644
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--- a/src/lundump.c
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+++ b/src/lundump.c
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@@ -248,6 +248,8 @@ static void loadDebug (LoadState *S, Proto *f) {
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f->locvars[i].endpc = loadInt(S);
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}
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n = loadInt(S);
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+ if (n != 0) /* does it have debug information? */
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+ n = f->sizeupvalues; /* must be this many */
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for (i = 0; i < n; i++)
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f->upvalues[i].name = loadStringN(S, f);
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}
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diff --git a/testes/calls.lua b/testes/calls.lua
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index a19385843..2d562a24a 100644
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--- a/testes/calls.lua
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+++ b/testes/calls.lua
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@@ -342,6 +342,20 @@ do -- another bug (in 5.4.0)
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end
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+do -- another bug (since 5.2)
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+ -- corrupted binary dump: list of upvalue names is larger than number
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+ -- of upvalues, overflowing the array of upvalues.
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+ local code =
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+ "\x1b\x4c\x75\x61\x54\x00\x19\x93\x0d\x0a\x1a\x0a\x04\x08\x08\x78\x56\z
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+ \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x28\x77\x40\x00\x86\x40\z
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+ \x74\x65\x6d\x70\x81\x81\x01\x00\x02\x82\x48\x00\x02\x00\xc7\x00\x01\z
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+ \x00\x80\x80\x80\x82\x00\x00\x80\x81\x82\x78\x80\x82\x81\x86\x40\x74\z
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+ \x65\x6d\x70"
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+
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+ assert(load(code)) -- segfaults in previous versions
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+end
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+
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+
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x = string.dump(load("x = 1; return x"))
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a = assert(load(read1(x), nil, "b"))
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assert(a() == 1 and _G.x == 1)
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