gwj / at91sam9263 · Commits

Commit 45bc1f5264a6835239e1c183b78d40bb45310f6c

Authored by aurel32
1 parent fb1c2cd7

linux-user: mmap: add check if requested memory area fits target address space 

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5958 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 1 changed file with 10 additions and 0 deletions
linux-user/mmap.c
  View file @45bc1f5
... ... @@ -382,6 +382,16 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
382 382 end = start + len;
383 383 real_end = HOST_PAGE_ALIGN(end);
384 384  
  385 + /*
  386 + * Test if requested memory area fits target address space
  387 + * It can fail only on 64-bit host with 32-bit target.
  388 + * On any other target/host host mmap() handles this error correctly.
  389 + */
  390 + if ((unsigned long)start + len - 1 > (abi_ulong) -1) {
  391 + errno = EINVAL;
  392 + goto fail;
  393 + }
  394 +
385 395 for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
386 396 flg = page_get_flags(addr);
387 397 if (flg & PAGE_RESERVED) {
... ...