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* mmap.cc (msync): Check area given by addr and len for being a

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contigeous mmap'd region.
This commit is contained in:
Corinna Vinschen 2002-03-11 20:23:09 +00:00
parent af53a09c70
commit 2817e0dc89
2 changed files with 14 additions and 4 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2002-03-11 Corinna Vinschen <corina@vinschen.de>
* mmap.cc (msync): Check area given by addr and len for being a
contigeous mmap'd region.
2002-03-11 Corinna Vinschen <corina@vinschen.de> 2002-03-11 Corinna Vinschen <corina@vinschen.de>
* fork.cc (fork_child): Call fixup_mmaps_after_fork() before * fork.cc (fork_child): Call fixup_mmaps_after_fork() before

13
winsup/cygwin/mmap.cc
View File

@ -674,8 +674,12 @@ msync (caddr_t addr, size_t len, int flags)
for (int li = 0; li < l->nrecs; ++li) for (int li = 0; li < l->nrecs; ++li)
{ {
mmap_record *rec = l->recs + li; mmap_record *rec = l->recs + li;
if (rec->get_address () == addr) if (rec->access (addr))
{ {
/* Check whole area given by len. */
for (DWORD i = getpagesize (); i < len; ++i)
if (!rec->access (addr + i))
goto invalid_address_range;
fhandler_base *fh = rec->alloc_fh (); fhandler_base *fh = rec->alloc_fh ();
int ret = fh->msync (rec->get_handle (), addr, len, flags); int ret = fh->msync (rec->get_handle (), addr, len, flags);
rec->free_fh (fh); rec->free_fh (fh);
@ -688,10 +692,11 @@ msync (caddr_t addr, size_t len, int flags)
ReleaseResourceLock(LOCK_MMAP_LIST, WRITE_LOCK | READ_LOCK, "msync"); ReleaseResourceLock(LOCK_MMAP_LIST, WRITE_LOCK | READ_LOCK, "msync");
return 0; return 0;
} }
} }
} }
} }
invalid_address_range:
/* SUSv2: Return code if indicated memory was not mapped is ENOMEM. */ /* SUSv2: Return code if indicated memory was not mapped is ENOMEM. */
set_errno (ENOMEM); set_errno (ENOMEM);
syscall_printf ("-1 = msync(): ENOMEM"); syscall_printf ("-1 = msync(): ENOMEM");