!34 fix CVE-2021-42376
From: @xiechengliang Reviewed-by: @flyflyflypeng,@duguhaotian Signed-off-by: @duguhaotian
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backport-CVE-2021-42376.patch
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134
backport-CVE-2021-42376.patch
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From 32eeace23c100a733e2b7fa980683b9939892b55 Mon Sep 17 00:00:00 2001
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From: xiechengliang <xiechengliang1@huawei.com>
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Date: Sat, 20 Nov 2021 10:07:35 +0800
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Subject: [PATCH] hush: fix handling of \^C and "^C"
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function old new delta
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parse_stream 2238 2252 +14
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encode_string 243 256 +13
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------------------------------------------------------------------------------
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 27/0) Total: 27 bytes
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backport from upstream:
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https://git.busybox.net/busybox/commit/?id=1b7a9b68d0e9aa19147d7fda16eb9a6b54156985
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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---
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shell/ash_test/ash-misc/control_char3.right | 1 +
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shell/ash_test/ash-misc/control_char3.tests | 2 ++
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shell/ash_test/ash-misc/control_char4.right | 1 +
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shell/ash_test/ash-misc/control_char4.tests | 2 ++
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shell/hush.c | 11 +++++++++++
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shell/hush_test/hush-misc/control_char3.right | 1 +
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shell/hush_test/hush-misc/control_char3.tests | 2 ++
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shell/hush_test/hush-misc/control_char4.right | 1 +
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shell/hush_test/hush-misc/control_char4.tests | 2 ++
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9 files changed, 23 insertions(+)
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create mode 100644 shell/ash_test/ash-misc/control_char3.right
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create mode 100755 shell/ash_test/ash-misc/control_char3.tests
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create mode 100644 shell/ash_test/ash-misc/control_char4.right
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create mode 100755 shell/ash_test/ash-misc/control_char4.tests
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create mode 100644 shell/hush_test/hush-misc/control_char3.right
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create mode 100755 shell/hush_test/hush-misc/control_char3.tests
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create mode 100644 shell/hush_test/hush-misc/control_char4.right
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create mode 100755 shell/hush_test/hush-misc/control_char4.tests
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diff --git a/shell/ash_test/ash-misc/control_char3.right b/shell/ash_test/ash-misc/control_char3.right
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new file mode 100644
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index 000000000..283e02cbb
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--- /dev/null
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+++ b/shell/ash_test/ash-misc/control_char3.right
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@@ -0,0 +1 @@
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+SHELL: line 1: : not found
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diff --git a/shell/ash_test/ash-misc/control_char3.tests b/shell/ash_test/ash-misc/control_char3.tests
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new file mode 100755
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index 000000000..4359db3f3
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--- /dev/null
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+++ b/shell/ash_test/ash-misc/control_char3.tests
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@@ -0,0 +1,2 @@
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+# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
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+$THIS_SH -c '\' SHELL
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diff --git a/shell/ash_test/ash-misc/control_char4.right b/shell/ash_test/ash-misc/control_char4.right
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new file mode 100644
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index 000000000..2bf18e684
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--- /dev/null
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+++ b/shell/ash_test/ash-misc/control_char4.right
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@@ -0,0 +1 @@
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+SHELL: line 1: -: not found
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diff --git a/shell/ash_test/ash-misc/control_char4.tests b/shell/ash_test/ash-misc/control_char4.tests
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new file mode 100755
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index 000000000..48010f154
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--- /dev/null
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+++ b/shell/ash_test/ash-misc/control_char4.tests
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@@ -0,0 +1,2 @@
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+# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
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+$THIS_SH -c '"-"' SHELL
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diff --git a/shell/hush.c b/shell/hush.c
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index 8d9ab244e..f1ceb80bb 100644
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--- a/shell/hush.c
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+++ b/shell/hush.c
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@@ -5167,6 +5167,11 @@ static int encode_string(o_string *as_string,
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}
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#endif
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o_addQchr(dest, ch);
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+ if (ch == SPECIAL_VAR_SYMBOL) {
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+ /* Convert "^C" to corresponding special variable reference */
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+ o_addchr(dest, SPECIAL_VAR_QUOTED_SVS);
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+ o_addchr(dest, SPECIAL_VAR_SYMBOL);
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+ }
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goto again;
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#undef as_string
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}
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@@ -5278,6 +5283,11 @@ static struct pipe *parse_stream(char **pstring,
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if (ch == '\n')
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continue; /* drop \<newline>, get next char */
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nommu_addchr(&ctx.as_string, '\\');
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+ if (ch == SPECIAL_VAR_SYMBOL) {
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+ nommu_addchr(&ctx.as_string, ch);
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+ /* Convert \^C to corresponding special variable reference */
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+ goto case_SPECIAL_VAR_SYMBOL;
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+ }
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o_addchr(&ctx.word, '\\');
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if (ch == EOF) {
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/* Testcase: eval 'echo Ok\' */
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@@ -5596,6 +5606,7 @@ static struct pipe *parse_stream(char **pstring,
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/* Note: nommu_addchr(&ctx.as_string, ch) is already done */
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switch (ch) {
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+ case_SPECIAL_VAR_SYMBOL:
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case SPECIAL_VAR_SYMBOL:
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/* Convert raw ^C to corresponding special variable reference */
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o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
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diff --git a/shell/hush_test/hush-misc/control_char3.right b/shell/hush_test/hush-misc/control_char3.right
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new file mode 100644
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index 000000000..94b4f8699
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--- /dev/null
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+++ b/shell/hush_test/hush-misc/control_char3.right
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@@ -0,0 +1 @@
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+hush: can't execute '': No such file or directory
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diff --git a/shell/hush_test/hush-misc/control_char3.tests b/shell/hush_test/hush-misc/control_char3.tests
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new file mode 100755
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index 000000000..4359db3f3
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--- /dev/null
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+++ b/shell/hush_test/hush-misc/control_char3.tests
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@@ -0,0 +1,2 @@
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+# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
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+$THIS_SH -c '\' SHELL
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diff --git a/shell/hush_test/hush-misc/control_char4.right b/shell/hush_test/hush-misc/control_char4.right
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new file mode 100644
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index 000000000..698e21427
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--- /dev/null
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+++ b/shell/hush_test/hush-misc/control_char4.right
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@@ -0,0 +1 @@
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+hush: can't execute '-': No such file or directory
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diff --git a/shell/hush_test/hush-misc/control_char4.tests b/shell/hush_test/hush-misc/control_char4.tests
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new file mode 100755
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index 000000000..48010f154
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--- /dev/null
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+++ b/shell/hush_test/hush-misc/control_char4.tests
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@@ -0,0 +1,2 @@
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+# (set argv0 to "SHELL" to avoid "/path/to/shell: blah" in error messages)
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+$THIS_SH -c '"-"' SHELL
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--
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2.27.0
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@ -4,7 +4,7 @@
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%endif
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%if "%{!?RELEASE:1}"
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%define RELEASE 8
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%define RELEASE 9
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%endif
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Name: busybox
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@ -23,6 +23,7 @@ Patch6000: backport-CVE-2018-1000500.patch
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Patch6001: backport-CVE-2021-28831.patch
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Patch6002: backport-CVE-2021-42374.patch
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Patch6003: backport-CVE-2021-42377.patch
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Patch6004: backport-CVE-2021-42376.patch
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BuildRoot: %_topdir/BUILDROOT
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#Dependency
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@ -98,6 +99,12 @@ install -m 644 docs/busybox.dynamic.1 $RPM_BUILD_ROOT/%{_mandir}/man1/busybox.1
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%{_mandir}/man1/busybox.petitboot.1.gz
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%changelog
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* Wed Nov 24 2021 xiechengliang<xiechengliang1@huawei.com> - 1:1.31.1-9
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- Type:CVE
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- Id:NA
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- SUG:NA
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- DESC: fix CVE-2021-42376
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* Mon Nov 22 2021 jikui<jikui2@huawei.com> - 1:1.31.1-8
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- Type:CVE
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- Id:NA
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