derek.holloway
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37 lines
1.4 KiB
ArmAsm
37 lines
1.4 KiB
ArmAsm
/* PR 25662: objcopy sets invalid sh_offset for the first section in a
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no_contents segment containing program headers.
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Several conditions are required for the bug to manifest:
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- The first loadable segment (which contains the program headers) must only
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contain SHT_NOBITS sections. .bss is the SHT_NOBITS section in this test.
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- The next loadable segment must have a !SHT_NOBITS loadable section. .data
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is the !SHT_NOBITS section in this test.
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- .bss must be positioned after .data in the executable file itself.
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- The size of .data must be such that the calculated VMA of the .bss
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section that follows it is not congruent with the file offset of .bss,
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modulo the p_align of its segment, i.e.:
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(VMA(.data) + sizeof(.data)) % (.bss_segment.p_align) != 0
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This will force the sh_offset of .bss to be aligned so it appears within
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.data.
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- The size of .data must be larger than the program headers in the first
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loadable segment, so that the file offset of .bss is immediately
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after .data, and not padded to a valid alignment by the program headers.
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The bug originally only manifested for ELF targets, but there's no reason not
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to run this testcase for other file formats. This variant source for pdp11
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uses .text rather than .section text, etc., because the latter are not
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supported, */
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.bss
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a:
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.zero 0x2
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.data
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c:
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.zero 0x201
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.text
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.global _start
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_start:
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.long 0
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