Support modules with a lot of sections #280
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A module might contain more than 65535 sections. Prepare support for such module files by turning relevant fields into uint32_t. Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Read extra fields from section header 0 if needed. Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
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| idx, elf->header.section.count); | ||
| return 0; | ||
| } | ||
| return elf->header.section.offset + | ||
| (uint64_t)(idx * elf->header.section.entry_size); | ||
| (uint64_t)idx * elf->header.section.entry_size; |
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Not sure how easy is for the uint16_t * uint16_t overflow to trigger, but let's keep this change as separate commit.
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Since idx is changed in this PR to a uint32_t and the C standard would therefore use unsigned int for the result, it would be possible.
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Not 100% sure about the second commit but the first one looks solid. @stoeckmann can you address my minor comment and undraft? |
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I've kept it as a draft because the linux kernel itself cannot support such modules either (as confirmed in #277). I have used this PR for easier testing/reference to the linked issue. If we want to support possible features of future kernels we could merge this, but right now it's just a possible way of introducing bugs for no practical gain. |
It seems that it's possible to compile modules with more than 0xFF00 sections. This leads to different fields in ELF files used to handle such a large amount of sections.
Parse proper fields if necessary.