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busybox: Fix CVE-2023-42363

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Upstream-Status: Backport from https://git.busybox.net/busybox/commit/?id=fb08d43d44d1fea1f741fafb9aa7e1958a5f69aa

(From OE-Core rev: 929deb4a80d65dc3a6e9a523f1aed12635ed7d53)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Hitendra Prajapati
2024-07-16 11:26:43 +05:30
committed by Steve Sakoman
parent 6bd3969d32
commit 4bad38de6e
2 changed files with 68 additions and 0 deletions
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67
meta/recipes-core/busybox/busybox/CVE-2023-42363.patch Normal file
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@@ -0,0 +1,67 @@
From fb08d43d44d1fea1f741fafb9aa7e1958a5f69aa Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Mon, 20 May 2024 17:55:28 +0200
Subject: awk: fix use after free (CVE-2023-42363)
function old new delta
evaluate 3377 3385 +8
Fixes https://bugs.busybox.net/show_bug.cgi?id=15865
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream-Status: Backport [https://git.busybox.net/busybox/commit/?id=fb08d43d44d1fea1f741fafb9aa7e1958a5f69aa]
CVE: CVE-2023-42363
Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
---
editors/awk.c | 21 +++++++++++++--------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/editors/awk.c b/editors/awk.c
index 654cbac..4fbc11d 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -2889,19 +2889,14 @@ static var *evaluate(node *op, var *res)
if ((opinfo & OF_REQUIRED) && !op1)
syntax_error(EMSG_TOO_FEW_ARGS);
L.v = evaluate(op1, TMPVAR0);
- if (opinfo & OF_STR1) {
- L.s = getvar_s(L.v);
- debug_printf_eval("L.s:'%s'\n", L.s);
- }
if (opinfo & OF_NUM1) {
L_d = getvar_i(L.v);
debug_printf_eval("L_d:%f\n", L_d);
}
}
- /* NB: Must get string/numeric values of L (done above)
- * _before_ evaluate()'ing R.v: if both L and R are $NNNs,
- * and right one is large, then L.v points to Fields[NNN1],
- * second evaluate() reallocates and moves (!) Fields[],
+ /* NB: if both L and R are $NNNs, and right one is large,
+ * then at this pint L.v points to Fields[NNN1], second
+ * evaluate() below reallocates and moves (!) Fields[],
* R.v points to Fields[NNN2] but L.v now points to freed mem!
* (Seen trying to evaluate "$444 $44444")
*/
@@ -2914,6 +2909,16 @@ static var *evaluate(node *op, var *res)
debug_printf_eval("R.s:'%s'\n", R.s);
}
}
+ /* Get L.s _after_ R.v is evaluated: it may have realloc'd L.v
+ * so we must get the string after "old_Fields_ptr" correction
+ * above. Testcase: x = (v = "abc", gsub("b", "X", v));
+ */
+ if (opinfo & OF_RES1) {
+ if (opinfo & OF_STR1) {
+ L.s = getvar_s(L.v);
+ debug_printf_eval("L.s:'%s'\n", L.s);
+ }
+ }
debug_printf_eval("switch(0x%x)\n", XC(opinfo & OPCLSMASK));
switch (XC(opinfo & OPCLSMASK)) {
--
2.25.1

1
meta/recipes-core/busybox/busybox_1.35.0.bb
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@@ -52,6 +52,7 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
file://CVE-2022-30065.patch \
file://0001-devmem-add-128-bit-width.patch \
file://CVE-2022-48174.patch \
file://CVE-2023-42363.patch \
"
SRC_URI:append:libc-musl = " file://musl.cfg "