Re: [PATCH] no-execute -- please test
On 8/14/06, Michel Dänzer <michel@tungstengraphics.com> wrote:
The diff between the log files doesn't show any explanation as to why it
works in one case but doesn't in the other, maybe the difference really
lies on the client side?
You're right. Somehow I hadn't spotted this in my syslog:
fuckup @ 1002f158 with trap 0x400 code 10000000 by x-session-manag
That is the GNOME session manager.
The /proc/*/maps file contains this:
1002f000-101dc000 rwxp 1002f000 00:00 0 [heap]
Why the heck is the heap being executed?
If this is legit, how do I recognize it?
As far as I can tell, this is not the PLT area
and anyway the PLT is marked executable.
$ file /usr/bin/gnome-session
/usr/bin/gnome-session: ELF 32-bit MSB executable, PowerPC or cisco
4500, version 1 (SYSV), for GNU/Linux 2.4.1, dynamically linked (uses
shared libs), for GNU/Linux 2.4.1, stripped
------------------- some eu-readelf stuff -----------------------
ELF Header:
Magic: 7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, big endian
Ident Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: PowerPC
Version: 1 (current)
Entry point address: 0x100077d0
Start of program headers: 52 (bytes into file)
Start of section headers: 124156 (bytes into file)
Flags:
Size of this header: 52 (bytes)
Size of program header entries: 32 (bytes)
Number of program headers entries: 7
Size of section header entries: 40 (bytes)
Number of section headers entries: 27
Section header string table index: 26
Section Headers:
[Nr] Name Type Addr Off Size ES Flags Lk Inf Al
[ 0] NULL 00000000 000000 000000 0 0 0 0
[ 1] .interp PROGBITS 10000114 000114 00000d 0 A 0 0 1
[ 2] .note.ABI-tag NOTE 10000124 000124 000020 0 A 0 0 4
[ 3] .hash HASH 10000144 000144 0017ec 4 A 4 0 4
[ 4] .dynsym DYNSYM 10001930 001930 002160 16 A 5 1 4
[ 5] .dynstr STRTAB 10003a90 003a90 00251a 0 A 0 0 1
[ 6] .gnu.version GNU_versym 10005faa 005faa 00042c 2 A 4 0 2
[ 7] .gnu.version_r GNU_verneed 100063d8 0063d8 000070 0 A 5 2 4
[ 8] .rela.dyn RELA 10006448 006448 00003c 12 A 4 0 4
[ 9] .rela.plt RELA 10006484 006484 001320 12 A 4 24 4
[10] .init PROGBITS 100077a4 0077a4 000028 0 AX 0 0 4
[11] .text PROGBITS 100077d0 0077d0 0132b0 0 AX 0 0 16
[12] .fini PROGBITS 1001aa80 01aa80 000020 0 AX 0 0 4
[13] .rodata PROGBITS 1001aaa0 01aaa0 003630 0 A 0 0 8
[14] .eh_frame PROGBITS 1001e0d0 01e0d0 000004 0 A 0 0 4
[15] .ctors PROGBITS 1002e0d4 01e0d4 000008 0 WA 0 0 4
[16] .dtors PROGBITS 1002e0dc 01e0dc 000008 0 WA 0 0 4
[17] .jcr PROGBITS 1002e0e4 01e0e4 000004 0 WA 0 0 4
[18] .got2 PROGBITS 1002e0e8 01e0e8 000010 0 WA 0 0 1
[19] .dynamic DYNAMIC 1002e0f8 01e0f8 000180 8 WA 5 0 4
[20] .data PROGBITS 1002e278 01e278 00018c 0 WA 0 0 4
[21] .got PROGBITS 1002e404 01e404 000014 4 WAX 0 0 4
[22] .sdata PROGBITS 1002e418 01e418 000018 0 WA 0 0 4
[23] .sbss NOBITS 1002e430 01e430 000118 0 WA 0 0 4
[24] .plt NOBITS 1002e548 01e430 001368 0 WAX 0 0 4
[25] .bss NOBITS 1002f8b0 01e430 000078 0 WA 0 0 4
[26] .shstrtab STRTAB 00000000 01e430 0000ca 0 0 0 1
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x10000034 0x10000034 0x0000e0 0x0000e0 R E 0x4
INTERP 0x000114 0x10000114 0x10000114 0x00000d 0x00000d R 0x1
[Requesting program interpreter: /lib/ld.so.1]
LOAD 0x000000 0x10000000 0x10000000 0x01e0d4 0x01e0d4 R E 0x10000
LOAD 0x01e0d4 0x1002e0d4 0x1002e0d4 0x00035c 0x001854 RWE 0x10000
DYNAMIC 0x01e0f8 0x1002e0f8 0x1002e0f8 0x000180 0x000180 RW 0x4
NOTE 0x000124 0x10000124 0x10000124 0x000020 0x000020 R 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x000000 0x000000 RW 0x4
Section to Segment mapping:
Segment Sections...
00
01 [RO: .interp]
02 [RO: .interp .note.ABI-tag .hash .dynsym .dynstr
.gnu.version .gnu.version_r .rela.dyn .rela.plt .init .text .fini .
rodata .eh_frame]
03 .ctors .dtors .jcr .got2 .dynamic .data .got .sdata .sbss .plt .bss
04 .dynamic
05 [RO: .note.ABI-tag]
06
Dynamic segment contains 48 entries:
Addr: 0x1002e0f8 Offset: 0x01e0f8 Link to section: [ 5] '.dynstr'
Type Value
NEEDED Shared library: [libgnome-desktop-2.so.2]
NEEDED Shared library: [libgnomeui-2.so.0]
NEEDED Shared library: [libstartup-notification-1.so.0]
NEEDED Shared library: [libSM.so.6]
NEEDED Shared library: [libICE.so.6]
NEEDED Shared library: [libgnome-2.so.0]
NEEDED Shared library: [libesd.so.0]
NEEDED Shared library: [libgtk-x11-2.0.so.0]
NEEDED Shared library: [libgdk-x11-2.0.so.0]
NEEDED Shared library: [libatk-1.0.so.0]
NEEDED Shared library: [libgdk_pixbuf-2.0.so.0]
NEEDED Shared library: [libXrandr.so.2]
NEEDED Shared library: [libpango-1.0.so.0]
NEEDED Shared library: [libX11.so.6]
NEEDED Shared library: [libbonobo-2.so.0]
NEEDED Shared library: [libgconf-2.so.4]
NEEDED Shared library: [libbonobo-activation.so.4]
NEEDED Shared library: [libORBit-2.so.0]
NEEDED Shared library: [libgobject-2.0.so.0]
NEEDED Shared library: [libpthread.so.0]
NEEDED Shared library: [libglib-2.0.so.0]
NEEDED Shared library: [libwrap.so.0]
NEEDED Shared library: [libc.so.6]
NEEDED Shared library: [libXau.so.6]
INIT 0x100077a4
FINI 0x1001aa80
HASH 0x10000144
STRTAB 0x10003a90
SYMTAB 0x10001930
STRSZ 9498 (bytes)
SYMENT 16 (bytes)
DEBUG
PLTGOT 0x1002e548
PLTRELSZ 4896 (bytes)
PLTREL RELA
JMPREL 0x10006484
RELA 0x10006448
RELASZ 4956 (bytes)
RELAENT 12 (bytes)
VERNEED 0x100063d8
VERNEEDNUM 2
VERSYM 0x10005faa
NULL
NULL
NULL
NULL
NULL
NULL
Version needs section [ 7] '.gnu.version_r' contains 2 entries:
Addr: 0x100063d8 Offset: 0x0063d8 Link to section: [ 5] '.dynstr'
000000: Version: 1 File: libpthread.so.0 Cnt: 1
0x0010: Name: GLIBC_2.0 Flags: none Version: 3
0x0020: Version: 1 File: libc.so.6 Cnt: 4
0x0030: Name: GLIBC_2.3 Flags: none Version: 6
0x0040: Name: GLIBC_2.2 Flags: none Version: 5
0x0050: Name: GLIBC_2.1 Flags: none Version: 4
0x0060: Name: GLIBC_2.0 Flags: none Version: 2
Note segment of 32 bytes at offset 0x124:
Owner Data size Type
GNU 16 VERSION
OS: Linux, ABI: 2.4.1
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