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* mmap.cc (gen_create_protect): Always generate WRITECOPY protection

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for private maps.
	(fixup_mmaps_after_fork): Fix calculation of WRITECOPY protection for
	VirtualProtect.  Add some words to the comment.
This commit is contained in:
Corinna Vinschen 2005-12-12 10:00:32 +00:00
parent 4e8e54543e
commit 2193d02b4d
2 changed files with 19 additions and 10 deletions
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7
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,10 @@
2005-12-12 Corinna Vinschen <corinna@vinschen.de>
* mmap.cc (gen_create_protect): Always generate WRITECOPY protection
for private maps.
(fixup_mmaps_after_fork): Fix calculation of WRITECOPY protection for
VirtualProtect. Add some words to the comment.
2005-12-10 Christopher Faylor <cgf@timesys.com>
* dirent.h: Change the rest of the d_ino's to __deprecated_d_ino.

22
winsup/cygwin/mmap.cc
View File

@ -98,8 +98,10 @@ gen_create_protect (DWORD openflags, int flags)
{
DWORD ret = PAGE_READONLY;
if (openflags & GENERIC_WRITE)
ret = priv (flags) ? PAGE_WRITECOPY : PAGE_READWRITE;
if (priv (flags))
ret = PAGE_WRITECOPY;
else if (openflags & GENERIC_WRITE)
ret = PAGE_READWRITE;
/* Ignore EXECUTE permission on 9x. */
if ((openflags & GENERIC_EXECUTE)
@ -1963,16 +1965,16 @@ fixup_mmaps_after_fork (HANDLE parent)
"address %p, %E", address);
return -1;
}
else if ((mbi.AllocationProtect & PAGE_WRITECOPY)
else if ((mbi.AllocationProtect == PAGE_WRITECOPY
|| mbi.AllocationProtect == PAGE_EXECUTE_WRITECOPY)
&& (mbi.Protect == PAGE_READWRITE
|| mbi.Protect == PAGE_EXECUTE_READWRITE))
{
/* A PAGE_WRITECOPY page which has been written to is
set to PAGE_READWRITE, but that's an incompatible
protection to set the page to. */
mbi.Protect &= ~PAGE_READWRITE;
mbi.Protect |= PAGE_WRITECOPY;
}
/* A WRITECOPY page which has been written to is set to
READWRITE, but that's an incompatible protection to
set the page to. Convert the protection to WRITECOPY
so that the below VirtualProtect doesn't fail. */
mbi.Protect <<= 1;
if (!ReadProcessMemory (parent, address, address,
mbi.RegionSize, NULL))
{