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bug#8395: ASLR Issue?
From: |
Bob Halley |
Subject: |
bug#8395: ASLR Issue? |
Date: |
Tue, 5 Jul 2011 15:45:49 +0100 |
I too see this problem trying to build Aquamacs' emacs-24-based branch on Lion
GM with Xcode 4.1 preview 7. The problem is *not* an unknown section name. I
added some debugging printfs, and this is what I see. Basically things seem to
be going OK until we try to write __data, where we get EFAULT when we try to
write() it. I don't know why sectp->addr is giving EFAULT; perhaps ASLR?
If I discover more, I will add to the ticket.
As an aside, could emacs switch to an external core image like other lisps use
instead of continuing to use the fragile unexec mechanism?
--- Load Commands written to Output File ---
Writing segment __PAGEZERO @ 0 ( 0/0x100000000 @ 0)
write 72
sz = 72
Writing segment __TEXT @ 0 (0x1ed000/0x1ed000 @ 0x100000000)
write 712
sz = 712
Writing segment __DATA @ 0x1ed000 (0x458000/0x458000 @ 0x1001ed000)
write 80
sz = 80
section __program_vars at 0x1ed000 - 0x1ed028 (sz: 0x28)
write 80
sz = 80
section __nl_symbol_ptr at 0x1ed028 - 0x1ed038 (sz: 0x10)
write 80
sz = 80
section __got at 0x1ed038 - 0x1ed208 (sz: 0x1d0)
write 80
sz = 80
section __la_symbol_ptr at 0x1ed208 - 0x1eda90 (sz: 0x888)
write 80
sz = 80
section __objc_classlist at 0x1eda90 - 0x1edb00 (sz: 0x70)
write 80
sz = 80
section __objc_protolist at 0x1edb00 - 0x1edb10 (sz: 0x10)
write 80
sz = 80
section __objc_imageinfo at 0x1edb10 - 0x1edb18 (sz: 0x8)
write 80
sz = 80
section __objc_const at 0x1edb18 - 0x1efef8 (sz: 0x23e0)
write 80
sz = 80
section __objc_selrefs at 0x1efef8 - 0x1f1030 (sz: 0x1138)
write 80
sz = 80
section __objc_msgrefs at 0x1f1030 - 0x1f1120 (sz: 0xf0)
write 80
sz = 80
section __objc_classrefs at 0x1f1120 - 0x1f1338 (sz: 0x218)
write 80
sz = 80
section __objc_superrefs at 0x1f1338 - 0x1f13a0 (sz: 0x68)
write 80
sz = 80
section __objc_data at 0x1f13a0 - 0x1f1800 (sz: 0x460)
sectp->addr = 1001f1800
write 4019480
sz = -1
errno = 14 Bad address
unexec: cannot write 1 section __data
- bug#8395: ASLR Issue?,
Bob Halley <=
- bug#8395: ASLR Issue?, YAMAMOTO Mitsuharu, 2011/07/06
- Message not available
- bug#8395: ASLR Issue?, YAMAMOTO Mitsuharu, 2011/07/07
- bug#8395: ASLR Issue?, Bob Halley, 2011/07/10
- bug#8395: ASLR Issue?, YAMAMOTO Mitsuharu, 2011/07/10
- bug#8395: ASLR Issue?, Bob Halley, 2011/07/11
- bug#8395: ASLR Issue?, YAMAMOTO Mitsuharu, 2011/07/11