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xen.11478
xnloader.py
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File xnloader.py of Package xen.11478
# NetWare-specific operations # # Copyright (c) 2013 Suse Linux Products. # Author: Charles Arnold <carnold@suse.com> # # This software may be freely redistributed under the terms of the GNU # general public license. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # 51 Franklin St, Boston, MA 02110 # Binary patching of xnloader.sys # For launching NetWare on Xen 4.2 and newer import os, sys, base64 CODE_OFFSET=0x49F5 NUMBER_OF_CODE_BYTES=17 ORIGINAL_CODE="BA00080000C786FC1F0000FFFFFFFF31C9" PATCHED_CODE="BAF8070000834C961CFFB9080000009090" XNLOADER_SYS_MD5SUM="eb76cce2a2d45928ea2bf26e01430af2" def patch_netware_loader(loader): """Open the given xnloader.sys file and patch the relevant code hunk.""" # domUloader calls this with all kernels so perhaps this is not the NetWare loader md5sum_cmd = 'md5sum ' + loader p = os.popen(md5sum_cmd) sum = p.read().split()[0] p.close() if sum != XNLOADER_SYS_MD5SUM: return try: fd = os.open(loader, os.O_RDWR) except Exception as e: print(e, file=sys.stderr) raise # Validate minimum size for I/O stat = os.fstat(fd) if stat.st_size < CODE_OFFSET+NUMBER_OF_CODE_BYTES: os.close(fd) return # Seek to location of code hunk os.lseek(fd, CODE_OFFSET, os.SEEK_SET) # Read code bytes at offset buf = os.read(fd, NUMBER_OF_CODE_BYTES) code_as_hex = base64.b16encode(buf) code_as_hex = code_as_hex.decode('utf-8') if code_as_hex == ORIGINAL_CODE: # Seek back to start location of the code hunk os.lseek(fd, CODE_OFFSET, os.SEEK_SET) # Convert the PATCHED_CODE string to raw binary code_as_bin = base64.b16decode(PATCHED_CODE) # Write the patched code os.write(fd, code_as_bin) os.close(fd)
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