Mercurial > dropbear
view libtommath/bn_mp_from_sbin.c @ 1861:2b3a8026a6ce
Add re-exec for server
This allows ASLR to re-randomize the address
space for every connection, preventing some
vulnerabilities from being exploitable by
repeated probing.
Overhead (memory and time) is yet to be confirmed.
At present this is only enabled on Linux. Other BSD platforms
with fexecve() would probably also work though have not been tested.
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 30 Jan 2022 10:14:56 +0800 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_FROM_SBIN_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* read signed bin, big endian, first byte is 0==positive or 1==negative */ mp_err mp_from_sbin(mp_int *a, const unsigned char *buf, size_t size) { mp_err err; /* read magnitude */ if ((err = mp_from_ubin(a, buf + 1, size - 1u)) != MP_OKAY) { return err; } /* first byte is 0 for positive, non-zero for negative */ if (buf[0] == (unsigned char)0) { a->sign = MP_ZPOS; } else { a->sign = MP_NEG; } return MP_OKAY; } #endif