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| author | Petr Štetiar <ynezz@true.cz> | 2020-11-20 13:13:27 +0100 |
|---|---|---|
| committer | Petr Štetiar <ynezz@true.cz> | 2020-11-23 22:37:03 +0100 |
| commit | 733a48273383e2337fcd7c0eb5ee8958f42dc4c0 (patch) | |
| tree | 0b354b914885cc819a54e58e7cf6b4716759a2d6 | |
| parent | c9c7b4b3945c01c2aadf3ef5d9a77c8200db80f1 (diff) | |
| download | openwrt-733a48273383e2337fcd7c0eb5ee8958f42dc4c0.tar.gz openwrt-733a48273383e2337fcd7c0eb5ee8958f42dc4c0.tar.bz2 openwrt-733a48273383e2337fcd7c0eb5ee8958f42dc4c0.zip | |
musl: handle wcsnrtombs destination buffer overflow (CVE-2020-28928)
The wcsnrtombs function in all musl libc versions up through 1.2.1 has
been found to have multiple bugs in handling of destination buffer
size when limiting the input character count, which can lead to
infinite loop with no forward progress (no overflow) or writing past
the end of the destination buffera.
This function is not used internally in musl and is not widely used,
but does appear in some applications. The non-input-limiting form
wcsrtombs is not affected.
All users of musl 1.2.1 and prior versions should apply the attached
patch, which replaces the overly complex and erroneous implementation.
The upcoming 1.2.2 release will adopt this new implementation.
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 4d4ef1058c0f10aa2fa4070cd6b9db4d48b94148)
| -rw-r--r-- | toolchain/musl/common.mk | 2 | ||||
| -rw-r--r-- | toolchain/musl/patches/700-wcsnrtombs-cve-2020-28928.diff | 65 |
2 files changed, 66 insertions, 1 deletions
diff --git a/toolchain/musl/common.mk b/toolchain/musl/common.mk index bb9d9a75a5..522fda4b92 100644 --- a/toolchain/musl/common.mk +++ b/toolchain/musl/common.mk @@ -9,7 +9,7 @@ include $(INCLUDE_DIR)/target.mk PKG_NAME:=musl PKG_VERSION:=1.1.24 -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_SOURCE_PROTO:=git PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION) diff --git a/toolchain/musl/patches/700-wcsnrtombs-cve-2020-28928.diff b/toolchain/musl/patches/700-wcsnrtombs-cve-2020-28928.diff new file mode 100644 index 0000000000..8465f9422a --- /dev/null +++ b/toolchain/musl/patches/700-wcsnrtombs-cve-2020-28928.diff @@ -0,0 +1,65 @@ +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; |