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work around linux bug in mprotect

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per POSIX: The mprotect() function shall change the access protections
to be that specified by prot for those whole pages containing any part
of the address space of the process starting at address addr and
continuing for len bytes.

on the other hand, linux mprotect fails with EINVAL if the base
address and/or length is not page-aligned, so we have to align them
before making the syscall.
This commit is contained in:
Rich Felker 2011-06-29 00:42:42 -04:00
parent 9f17413c75
commit af3d5405b8
1 changed files with 5 additions and 1 deletions
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6
src/mman/mprotect.c
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@ -1,7 +1,11 @@
#include <sys/mman.h>
#include <limits.h>
#include "syscall.h"
int mprotect(void *addr, size_t len, int prot)
{
return syscall(SYS_mprotect, addr, len, prot);
size_t start, end;
start = (size_t)addr & -PAGE_SIZE;
end = (size_t)((char *)addr + len + PAGE_SIZE-1) & -PAGE_SIZE;
return syscall(SYS_mprotect, start, end-start, prot);
}