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https://git.yoctoproject.org/poky
synced 2026-02-26 19:39:40 +01:00
3a39d96928
Fix the way the ELF size is compared to ensure that incorrectly sized ELF binaries are captured during the file scan. lib/oe/qa.py is changed to accept a bitsize as a parameter. Instead of previously defining true/false, it now takes "0" undefined, "32" 32-bit, and "64" 64-bit as the size argument. This allows us to preserve existing behavior of only loading one ELF type, while allowing the function to be able to discover the size on it's own. Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
class ELFFile:
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EI_NIDENT = 16
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EI_CLASS = 4
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EI_DATA = 5
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EI_VERSION = 6
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EI_OSABI = 7
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EI_ABIVERSION = 8
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# possible values for EI_CLASS
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ELFCLASSNONE = 0
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ELFCLASS32 = 1
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ELFCLASS64 = 2
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# possible value for EI_VERSION
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EV_CURRENT = 1
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# possible values for EI_DATA
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ELFDATANONE = 0
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ELFDATA2LSB = 1
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ELFDATA2MSB = 2
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def my_assert(self, expectation, result):
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if not expectation == result:
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#print "'%x','%x' %s" % (ord(expectation), ord(result), self.name)
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raise Exception("This does not work as expected")
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def __init__(self, name, bits = 0):
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self.name = name
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self.bits = bits
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def open(self):
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self.file = file(self.name, "r")
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self.data = self.file.read(ELFFile.EI_NIDENT+4)
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self.my_assert(len(self.data), ELFFile.EI_NIDENT+4)
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self.my_assert(self.data[0], chr(0x7f) )
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self.my_assert(self.data[1], 'E')
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self.my_assert(self.data[2], 'L')
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self.my_assert(self.data[3], 'F')
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if self.bits == 0:
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if self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS32):
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self.bits == 32
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elif self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS64):
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self.bits == 64
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else:
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# Not 32-bit or 64.. lets assert
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raise Exception("ELF but not 32 or 64 bit.")
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elif self.bits == 32:
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self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32))
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elif self.bits == 64:
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self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS64))
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else:
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raise Exception("Must specify unknown, 32 or 64 bit size.")
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self.my_assert(self.data[ELFFile.EI_VERSION], chr(ELFFile.EV_CURRENT) )
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self.sex = self.data[ELFFile.EI_DATA]
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if self.sex == chr(ELFFile.ELFDATANONE):
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raise Exception("self.sex == ELFDATANONE")
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elif self.sex == chr(ELFFile.ELFDATA2LSB):
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self.sex = "<"
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elif self.sex == chr(ELFFile.ELFDATA2MSB):
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self.sex = ">"
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else:
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raise Exception("Unknown self.sex")
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def osAbi(self):
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return ord(self.data[ELFFile.EI_OSABI])
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def abiVersion(self):
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return ord(self.data[ELFFile.EI_ABIVERSION])
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def abiSize(self):
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return self.bits
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def isLittleEndian(self):
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return self.sex == "<"
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def isBigEngian(self):
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return self.sex == ">"
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def machine(self):
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"""
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We know the sex stored in self.sex and we
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know the position
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"""
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import struct
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(a,) = struct.unpack(self.sex+"H", self.data[18:20])
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return a
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