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This backports a commit which fixes a use after free bug in awk. CVE-2022-30065 description: A use-after-free in Busybox 1.35-x's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the copyvar function. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
43 lines
1.2 KiB
Diff
43 lines
1.2 KiB
Diff
From e63d7cdfdac78c6fd27e9e63150335767592b85e Mon Sep 17 00:00:00 2001
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From: Natanael Copa <ncopa@alpinelinux.org>
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Date: Fri, 17 Jun 2022 17:45:34 +0200
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Subject: awk: fix use after free (CVE-2022-30065)
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fixes https://bugs.busybox.net/show_bug.cgi?id=14781
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function old new delta
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evaluate 3343 3357 +14
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Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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---
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editors/awk.c | 3 +++
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testsuite/awk.tests | 6 ++++++
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2 files changed, 9 insertions(+)
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--- a/editors/awk.c
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+++ b/editors/awk.c
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@@ -3114,6 +3114,9 @@ static var *evaluate(node *op, var *res)
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case XC( OC_MOVE ):
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debug_printf_eval("MOVE\n");
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+ /* make sure that we never return a temp var */
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+ if (L.v == TMPVAR0)
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+ L.v = res;
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/* if source is a temporary string, jusk relink it to dest */
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if (R.v == TMPVAR1
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&& !(R.v->type & VF_NUMBER)
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--- a/testsuite/awk.tests
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+++ b/testsuite/awk.tests
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@@ -469,4 +469,10 @@ testing 'awk printf %% prints one %' \
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"%\n" \
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'' ''
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+testing 'awk assign while test' \
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+ "awk '\$1==\$1=\"foo\" {print \$1}'" \
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+ "foo\n" \
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+ "" \
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+ "foo"
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+
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exit $FAILCOUNT
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