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fa13731a45
An SHT_NOBITS section contains no bytes and occupies no space in the
file. This change makes it return an error on reading from this section
so that it will force the caller to check for an SHT_NNOBITS section.
We have considered another option to return "nil, nil" for the Data
method. It's abandoned because it might lead a program to simply do
the wrong thing, thinking that the section is empty.
Please note that it breaks programs which expect a byte slice with the
length described by the sh_size field. There are two reasons to
introduce this breaking change: 1. SHT_NOBITS means no data and it's
unnecessary to allocate memory for it; 2. it could result in an OOM if
the file is corrupted and has a huge sh_size.
Fixes #54967.
Change-Id: I0c3ed4e097214fe88413d726a89122105ad45d4f
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