mmap(2) segaults with certain len values and MAP_ANON|MAP_FIXED
Alexander Best
alexbestms at math.uni-muenster.de
Wed Oct 21 01:41:23 UTC 2009
hi there,
just a little mmap(2) related question. running the following code causes a
segfault:
mmap( (void*)0x1000, 0x80047000, PROT_NONE, MAP_ANON|MAP_FIXED, -1, 0 );
while the following doesn't:
mmap( (void*)0x1000, 0xffffffff, PROT_NONE, MAP_ANON|MAP_FIXED, -1, 0 );
is this a known problem? seems reproducible on all branches.
cheers
alex
-------------- next part --------------
#include <sys/mman.h>
#include <stdlib.h>
#include <stdio.h>
int main()
{
printf("mmap: %p\n", mmap( (void*)0x1000, 0xffffffff, PROT_NONE, MAP_ANON|MAP_FIXED, -1, 0 ));
printf("mmap: %p\n", mmap( (void*)0x1000, 0x80047000, PROT_NONE, MAP_ANON|MAP_FIXED, -1, 0 ));
return 0;
}
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