From 45bc1f5264a6835239e1c183b78d40bb45310f6c Mon Sep 17 00:00:00 2001 From: aurel32 Date: Mon, 8 Dec 2008 18:12:33 +0000 Subject: linux-user: mmap: add check if requested memory area fits target address space Signed-off-by: Kirill A. Shutemov Acked-by: Edgar E. Iglesias Signed-off-by: Aurelien Jarno git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5958 c046a42c-6fe2-441c-8c8c-71466251a162 --- linux-user/mmap.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'linux-user/mmap.c') diff --git a/linux-user/mmap.c b/linux-user/mmap.c index d5f22b82b7..2d0c684f4c 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -382,6 +382,16 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, end = start + len; real_end = HOST_PAGE_ALIGN(end); + /* + * Test if requested memory area fits target address space + * It can fail only on 64-bit host with 32-bit target. + * On any other target/host host mmap() handles this error correctly. + */ + if ((unsigned long)start + len - 1 > (abi_ulong) -1) { + errno = EINVAL; + goto fail; + } + for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) { flg = page_get_flags(addr); if (flg & PAGE_RESERVED) { -- cgit v1.2.1