[2/2] kernel32: force 4096 byte page alignment.
Austin English
austinenglish at gmail.com
Tue Feb 17 01:35:36 CST 2015
On Mon, Feb 16, 2015 at 4:47 AM, Tijl Coosemans <tijl at freebsd.org> wrote:
> On Tue, 3 Feb 2015 10:16:33 +0100 Tijl Coosemans <tijl at FreeBSD.org> wrote:
> > On Mon, 02 Feb 2015 22:20:57 +0200 David Naylor <dbn at freebsd.org> wrote:
> >> FreeBSD prefers to use a 0x200000 (super) page alignment however this
> >> causes the image base to be displaced from the requested 0x7b800000.
> >> Forcing a smaller page size ensures FreeBSD can place the image starting
> >> at 0x7b800000.
> >
> > Just to clarify, the output of "readelf -l kernel32.dll.so" gives this:
>
> Can somebody run this command on Linux with kernel32.dll.so from a
> wine64 build and post the output? FreeBSD also uses GNU binutils so I
> would expect the problem to exist on Linux as well.
>
> > Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
> > LOAD 0x000000 0x7b800000 0x7b800000 0x0c9e74 0x0c9e74 R E 0x200000
> > LOAD 0x0ca000 0x7baca000 0x7baca000 0x1a7eb0 0x1a8550 RW 0x200000
> >
> > The segments have an alignment of 0x200000 bytes. This places the first
> > segment at 0x7b800000 and the second at 0x7ba00000+Offset. With a
> > MemSiz of 0x1a8550 this pushes the second segment over 0x7bc00000 where
> > ntdll has been mapped already so loading kernel32 at 0x7b800000 fails.
> >
> > The patch forces a smaller alignment so the second segment fits below
> > 0x7bc00000.
>
This is from wine-1.7.34:
[austin at localhost ~]$ readelf -l /opt/wine6432/wine-1.7.34/lib64/wine/
kernel32.dll.so
Elf file type is DYN (Shared object file)
Entry point 0x7b827080
There are 7 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000000 0x000000007b800000 0x000000007b800000
0x00000000000ce49c 0x00000000000ce49c R E 200000
LOAD 0x00000000000cf3c8 0x000000007bacf3c8 0x000000007bacf3c8
0x00000000001a8088 0x00000000001a8828 RW 200000
DYNAMIC 0x00000000000cfd88 0x000000007bacfd88 0x000000007bacfd88
0x00000000000001e0 0x00000000000001e0 RW 8
NOTE 0x00000000000001c8 0x000000007b8001c8 0x000000007b8001c8
0x0000000000000024 0x0000000000000024 R 4
GNU_EH_FRAME 0x00000000000ac1c0 0x000000007b8ac1c0 0x000000007b8ac1c0
0x0000000000004a44 0x0000000000004a44 R 4
GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 RW 10
GNU_RELRO 0x00000000000cf3c8 0x000000007bacf3c8 0x000000007bacf3c8
0x0000000000000c38 0x0000000000000c38 R 1
Section to Segment mapping:
Segment Sections...
00 .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version
.gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata
.eh_frame_hdr .eh_frame
01 .init_array .fini_array .jcr .data.rel.ro .dynamic .got .got.plt
.data .bss
02 .dynamic
03 .note.gnu.build-id
04 .eh_frame_hdr
05
06 .init_array .fini_array .jcr .data.rel.ro .dynamic .got
[austin at localhost ~]$ file /opt/wine6432/wine-1.7.34/lib64/wine/
kernel32.dll.so
/opt/wine6432/wine-1.7.34/lib64/wine/kernel32.dll.so: ELF 64-bit LSB shared
object, x86-64, version 1 (SYSV), dynamically linked,
BuildID[sha1]=5769ec1e68c8f3e7445f1b2370d457a52d3507f4, not stripped
--
-Austin
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