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Diffstat (limited to 'src/subhook_linux.c')
-rw-r--r-- | src/subhook_linux.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/subhook_linux.c b/src/subhook_linux.c new file mode 100644 index 0000000..3202cf6 --- /dev/null +++ b/src/subhook_linux.c @@ -0,0 +1,42 @@ +/* Copyright (c) 2012-2013 Zeex + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <stddef.h> +#include <stdint.h> +#include <stdlib.h> +#include <unistd.h> +#include <sys/mman.h> + +void *subhook_unprotect(void *address, size_t size) { + intptr_t pagesize; + + pagesize = sysconf(_SC_PAGESIZE); + address = (void *)((intptr_t)address & ~(pagesize - 1)); + + if (mprotect(address, size, PROT_READ | PROT_WRITE | PROT_EXEC) != 0) + return NULL; + + return address; +} |