From 4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Wed, 21 Jun 2017 22:43:57 +0200 Subject: Implement allocation buffers for internal use This commit adds fixed-size allocation buffers. The primary use case is in NSS modules, where dynamically sized data is stored in a fixed-size buffer provided by the caller. Other uses include a replacement of mempcpy cascades (which is safer due to the size checking inherent to allocation buffers). --- malloc/alloc_buffer_create_failure.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 malloc/alloc_buffer_create_failure.c (limited to 'malloc/alloc_buffer_create_failure.c') diff --git a/malloc/alloc_buffer_create_failure.c b/malloc/alloc_buffer_create_failure.c new file mode 100644 index 0000000000..5ffba22f7b --- /dev/null +++ b/malloc/alloc_buffer_create_failure.c @@ -0,0 +1,31 @@ +/* Terminate the process as the result of an invalid allocation buffer. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +void +__libc_alloc_buffer_create_failure (void *start, size_t size) +{ + char buf[200]; + __snprintf (buf, sizeof (buf), "Fatal glibc error: " + "invalid allocation buffer of size %zu\n", + size); + __libc_fatal (buf); +} +libc_hidden_def (__libc_alloc_buffer_create_failure) -- cgit v1.2.3