From: malc <av1474@comtv.ru>
To: qemu-devel@nongnu.org
Cc: Paul Brook <paul@codesourcery.com>,
Aurelien Jarno <aurelien@aurel32.net>
Subject: [Qemu-devel] linux-user issues
Date: Sat, 13 Mar 2010 03:21:59 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.00.1003130314190.6704@linmac> (raw)
a) elfload.c:859
#define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
This means that for 64bit guest on a 32bit host the _v's value is
silently reduced to 32bit, the cast should be abi_ulong.
b) mmap.c:428
real_start = start & qemu_host_page_mask;
Same thing basically qemu_host_page_mask is unsigned long and so
the upper bits are sliently cleared. Again qemu_host_page_mask
should probably be abi_ulong.
The above two make elf binary with one of the segments above 4G load
and run on 32bit guest only to fail well into execution and without
any indication that it shouldn't have been allowed to run in the first
place.
--
mailto:av1474@comtv.ru
next reply other threads:[~2010-03-13 0:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-13 0:21 malc [this message]
2010-03-13 0:45 ` [Qemu-devel] Re: linux-user issues Paul Brook
2010-03-13 2:06 ` malc
2010-03-14 15:11 ` Paul Brook
2010-03-14 15:36 ` malc
2010-03-14 23:37 ` malc
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