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musl - an implementation of the standard library for Linux-based systems
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the two/three/four byte memmem specializations are not prepared to handle haystacks shorter than the needle; they unconditionally read at least up to the needle length and subtract from the haystack length. if the haystack is shorter, the remaining haystack length underflows and produces an unbounded search which will eventually either crash or find a spurious match. the top-level memmem function attempted to avoid this case already by checking for haystack shorter than needle, but it failed to re-check after using memchr to remove the maximal prefix not containing the first byte of the needle. |
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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/