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authorA. Wilcox <AWilcox@Wilcox-Tech.com>2022-01-08 20:36:14 -0600
committerA. Wilcox <AWilcox@Wilcox-Tech.com>2022-05-01 17:05:42 -0500
commitce1622418ad86740b990af77050b5e5993c5c3b0 (patch)
tree6d78ed56e8ff8975a349f811a3b23eccc64c77af /system/musl/CVE-2020-28928.patch
parent89e8c432418cad583756bef9838a2622310b76ab (diff)
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system/musl: update to latest version. fixes #444.
Diffstat (limited to 'system/musl/CVE-2020-28928.patch')
-rw-r--r--system/musl/CVE-2020-28928.patch112
1 files changed, 0 insertions, 112 deletions
diff --git a/system/musl/CVE-2020-28928.patch b/system/musl/CVE-2020-28928.patch
deleted file mode 100644
index cc668e149..000000000
--- a/system/musl/CVE-2020-28928.patch
+++ /dev/null
@@ -1,112 +0,0 @@
-From 3ab2a4e02682df1382955071919d8aa3c3ec40d4 Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Thu, 19 Nov 2020 17:12:43 -0500
-Subject: [PATCH] rewrite wcsnrtombs to fix buffer overflow and other bugs
-
-the original wcsnrtombs implementation, which has been largely
-untouched since 0.5.0, attempted to build input-length-limiting
-conversion on top of wcsrtombs, which only limits output length. as
-best I recall, this choice was made out of a mix of disdain over
-having yet another variant function to implement (added in POSIX 2008;
-not standard C) and preference not to switch things around and
-implement the wcsrtombs in terms of the more general new function,
-probably over namespace issues. the strategy employed was to impose
-output limits that would ensure the input limit wasn't exceeded, then
-finish up the tail character-at-a-time. unfortunately, none of that
-worked correctly.
-
-first, the logic in the wcsrtombs loop was wrong in that it could
-easily get stuck making no forward progress, by imposing an output
-limit too small to convert even one character.
-
-the character-at-a-time loop that followed was even worse. it made no
-effort to ensure that the converted multibyte character would fit in
-the remaining output space, only that there was a nonzero amount of
-output space remaining. it also employed an incorrect interpretation
-of wcrtomb's interface contract for converting the null character,
-thereby failing to act on end of input, and remaining space accounting
-was subject to unsigned wrap-around. together these errors allow
-unbounded overflow of the destination buffer, controlled by input
-length limit and input wchar_t string contents.
-
-given the extent to which this function was broken, it's plausible
-that most applications that would have been rendered exploitable were
-sufficiently broken not to be usable in the first place. however, it's
-also plausible that common (especially ASCII-only) inputs succeeded in
-the wcsrtombs loop, which mostly worked, while leaving the wildly
-erroneous code in the second loop exposed to particular non-ASCII
-inputs.
-
-CVE-2020-28928 has been assigned for this issue.
----
- src/multibyte/wcsnrtombs.c | 46 ++++++++++++++++----------------------
- 1 file changed, 19 insertions(+), 27 deletions(-)
-
-diff --git a/src/multibyte/wcsnrtombs.c b/src/multibyte/wcsnrtombs.c
-index 676932b5..95e25e70 100644
---- a/src/multibyte/wcsnrtombs.c
-+++ b/src/multibyte/wcsnrtombs.c
-@@ -1,41 +1,33 @@
- #include <wchar.h>
-+#include <limits.h>
-+#include <string.h>
-
- size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
- {
-- size_t l, cnt=0, n2;
-- char *s, buf[256];
- const wchar_t *ws = *wcs;
-- const wchar_t *tmp_ws;
--
-- if (!dst) s = buf, n = sizeof buf;
-- else s = dst;
--
-- while ( ws && n && ( (n2=wn)>=n || n2>32 ) ) {
-- if (n2>=n) n2=n;
-- tmp_ws = ws;
-- l = wcsrtombs(s, &ws, n2, 0);
-- if (!(l+1)) {
-- cnt = l;
-- n = 0;
-+ size_t cnt = 0;
-+ if (!dst) n=0;
-+ while (ws && wn) {
-+ char tmp[MB_LEN_MAX];
-+ size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0);
-+ if (l==-1) {
-+ cnt = -1;
- break;
- }
-- if (s != buf) {
-- s += l;
-+ if (dst) {
-+ if (n<MB_LEN_MAX) {
-+ if (l>n) break;
-+ memcpy(dst, tmp, l);
-+ }
-+ dst += l;
- n -= l;
- }
-- wn = ws ? wn - (ws - tmp_ws) : 0;
-- cnt += l;
-- }
-- if (ws) while (n && wn) {
-- l = wcrtomb(s, *ws, 0);
-- if ((l+1)<=1) {
-- if (!l) ws = 0;
-- else cnt = l;
-+ if (!*ws) {
-+ ws = 0;
- break;
- }
-- ws++; wn--;
-- /* safe - this loop runs fewer than sizeof(buf) times */
-- s+=l; n-=l;
-+ ws++;
-+ wn--;
- cnt += l;
- }
- if (dst) *wcs = ws;
---
-2.25.4
-