Rich Felker
e5adcd97b5
as a result of incorrect bounds checking on the lead byte being decoded, certain invalid inputs which should produce an encoding error, such as "\xc8\x41", instead produced out-of-bounds loads from the ksc table. in a worst case, the loaded value may not be a valid unicode scalar value, in which case, if the output encoding was UTF-8, wctomb would return (size_t)-1, causing an overflow in the output pointer and remaining buffer size which could clobber memory outside of the output buffer. bug report was submitted in private by Nick Wellnhofer on account of potential security implications.
musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/