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sh: Fix mmap2 for handling differing PAGE_SIZEs.

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mmap2 uses a fixed page shift of 12, regardless of the PAGE_SIZE setting.
Fix up the mmap2 code to add some sanity checks on the mapping, and to
update pgoff accordingly.

Error handling bits based on 4280e3126f641898f0ed1a931645373d3489e2a6
("frv: fix mmap2 error handling").

Signed-off-by: Toshinobu Sugioka <sugioka@itonet.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Toshinobu Sugioka 2009-04-21 07:34:53 +09:00 committed by Paul Mundt
parent aefe647572
commit 8c31813f31
1 changed files with 9 additions and 0 deletions
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9
arch/sh/kernel/sys_sh.c
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@ -63,6 +63,15 @@ asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags, unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff) unsigned long fd, unsigned long pgoff)
{ {
/*
* The shift for mmap2 is constant, regardless of PAGE_SIZE
* setting.
*/
if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
return -EINVAL;
pgoff >>= PAGE_SHIFT - 12;
return do_mmap2(addr, len, prot, flags, fd, pgoff); return do_mmap2(addr, len, prot, flags, fd, pgoff);
} }