63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
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# NetWare-specific operations
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#
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# Copyright (c) 2013 Suse Linux Products.
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# Author: Charles Arnold <carnold@suse.com>
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#
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# This software may be freely redistributed under the terms of the GNU
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# general public license.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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# Binary patching of xnloader.sys
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# For launching NetWare on Xen 4.2 and newer
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import os, sys, base64
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CODE_OFFSET=0x49F5
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NUMBER_OF_CODE_BYTES=17
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ORIGINAL_CODE="BA00080000C786FC1F0000FFFFFFFF31C9"
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PATCHED_CODE="BAF8070000834C961CFFB9080000009090"
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XNLOADER_SYS_MD5SUM="eb76cce2a2d45928ea2bf26e01430af2"
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def patch_netware_loader(loader):
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"""Open the given xnloader.sys file and patch the relevant code hunk."""
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# domUloader calls this with all kernels so perhaps this is not the NetWare loader
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md5sum_cmd = 'md5sum ' + loader
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p = os.popen(md5sum_cmd)
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sum = p.read().split()[0]
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p.close()
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if sum != XNLOADER_SYS_MD5SUM:
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return
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try:
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fd = os.open(loader, os.O_RDWR)
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except Exception, e:
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print >>sys.stderr, e
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raise
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# Validate minimum size for I/O
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stat = os.fstat(fd)
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if stat.st_size < CODE_OFFSET+NUMBER_OF_CODE_BYTES:
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os.close(fd)
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return
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# Seek to location of code hunk
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os.lseek(fd, CODE_OFFSET, os.SEEK_SET)
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# Read code bytes at offset
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buf = os.read(fd, NUMBER_OF_CODE_BYTES)
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code_as_hex = base64.b16encode(buf)
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if code_as_hex == ORIGINAL_CODE:
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# Seek back to start location of the code hunk
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os.lseek(fd, CODE_OFFSET, os.SEEK_SET)
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# Convert the PATCHED_CODE string to raw binary
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code_as_bin = base64.b16decode(PATCHED_CODE)
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# Write the patched code
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os.write(fd, code_as_bin)
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os.close(fd)
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