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[MIPS] sys_mmap2 offset argument should always be shifted 12, not PAGE_SHIFT.

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This patch adjusts the offset argument passed into sys_mmap2 to be
always shifted 12, even when the native page size isn't 4K.  This is
what all existing userspace libraries expect.
    
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
This commit is contained in:
H. Peter Anvin 2006-02-24 21:20:29 -08:00 committed by Ralf Baechle
parent de862b488e
commit 947df17cb1
2 changed files with 8 additions and 1 deletions
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4
arch/mips/kernel/linux32.c
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@ -106,6 +106,10 @@ sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
unsigned long error;
error = -EINVAL;
if (pgoff & (~PAGE_MASK >> 12))
goto out;
pgoff >>= PAGE_SHIFT-12;
if (!(flags & MAP_ANONYMOUS)) {
error = -EBADF;
file = fget(fd);

5
arch/mips/kernel/syscall.c
View File

@ -162,7 +162,10 @@ asmlinkage unsigned long
sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
unsigned long flags, unsigned long fd, unsigned long pgoff)
{
return do_mmap2(addr, len, prot, flags, fd, pgoff);
if (pgoff & (~PAGE_MASK >> 12))
return -EINVAL;
return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
}
save_static_function(sys_fork);