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busybox: fix use after free in bc module

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Signed-off-by: jackey_1024 <jikui2@huawei.com>
This commit is contained in:
jackey_1024 2022-10-28 09:54:50 +08:00
parent a4f5931e8a
commit 61a5130356
2 changed files with 34 additions and 1 deletions
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29
backport-fix-use-after-free-in-bc-module.patch Normal file
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@ -0,0 +1,29 @@
From 907e1b3a22a8092461176af45468c5b1b9bf6cc0 Mon Sep 17 00:00:00 2001
From: jackey_1024 <jikui2@huawei.com>
Date: Fri, 28 Oct 2022 09:45:08 +0800
Subject: [PATCH] busybox: fix use after free in bc module
backport from upstream:
https://git.busybox.net/busybox/commit/?id=41d5f800a14769704082f7faeabb8435285499be
Signed-off-by: jackey_1024 <jikui2@huawei.com>
---
miscutils/bc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/miscutils/bc.c b/miscutils/bc.c
index f9b08b0..4363585 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -2892,6 +2892,8 @@ static char peek_inbuf(void)
) {
xc_read_line(&G.input_buffer, G.prs.lex_input_fp);
G.prs.lex_inbuf = G.input_buffer.v;
+ // lex_next_at may point to now-freed data, update it:
+ G.prs.lex_next_at = G.prs.lex_inbuf;
if (G.input_buffer.len <= 1) // on EOF, len is 1 (NUL byte)
G.prs.lex_input_fp = NULL;
}
--
2.25.1

6
busybox.spec
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@ -4,7 +4,7 @@
%endif
%if "%{!?RELEASE:1}"
%define RELEASE 17
%define RELEASE 18
%endif
Epoch: 1
@ -22,6 +22,7 @@ Source3: busybox-dynamic.config
Patch6000: backport-CVE-2022-28391.patch
Patch6001: backport-CVE-2022-30065.patch
Patch6002: backport-fix-use-after-free-in-bc-module.patch
BuildRoot: %_topdir/BUILDROOT
#Dependency
@ -97,6 +98,9 @@ install -m 644 docs/busybox.dynamic.1 $RPM_BUILD_ROOT/%{_mandir}/man1/busybox.1
%{_mandir}/man1/busybox.petitboot.1.gz
%changelog
* Fri Oct 28 2022 jikui <jikui2@huawei.com> - 1:1.34.1-18
- fix use after free in bc module
* Fri Aug 19 2022 jikui <jikui2@huawei.com> - 1:1.34.1-17
- Type:CVE
- Id:NA