diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2006-02-24 21:20:29 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2006-03-21 13:27:48 +0000 |
| commit | 947df17cb1be4c7239280a77263c249fde1379ef (patch) | |
| tree | 1e32d0e81848e59a9796c3034208aa72432583d0 | |
| parent | de862b488e81172d4c610945efd9f3fc7f4b84a7 (diff) | |
[MIPS] sys_mmap2 offset argument should always be shifted 12, not PAGE_SHIFT.
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>
---
| -rw-r--r-- | arch/mips/kernel/linux32.c | 4 | ||||
| -rw-r--r-- | arch/mips/kernel/syscall.c | 5 |
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c index 1e8d24823d3..013bc93688e 100644 --- a/arch/mips/kernel/linux32.c +++ b/arch/mips/kernel/linux32.c @@ -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); diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 55f2bc09529..2aeaa2fd4b3 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -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); |