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Update #590
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Regenerate warn files on the latest kernel commit fe8152b38d3
and latest syzkaller commit with fresh kernel config files.
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syz-check pointed to a new batch of bugs in descriptions.
Fix them.
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On latest kernel, with latest *.txt files and with kernels compiled with
-fno-eliminate-unused-debug-types -fno-eliminate-unused-debug-symbols flags.
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Update #590
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They mostly duplicate the warnings we already have for amd64/386.
But uncovered few very interesting local things (e.g. epoll_event
is packed only on amd64, so arm/arm64 layout is wrong, but 386
is correct because int64 alignment is different).
Update #590
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Lots of interesting findings...
Especially 2 byte uid/gid/pid.
Update #590
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Turns out int64 alignment is 4 on 386...
But on arm it's still 8.
Another amusing finding thanks to syz-check.
Update #590
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Update #590
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Sweeping fix of everything up to socket_netlink_route.txt.
Update #590
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Currently we print them as part of `make genereate`,
but nobody reads them, too much output each time.
Don't print them in `make generate` and instead
print in syz-check, the warn files are a good mechanism
to handle "known warnings".
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We assumed that for ConstType alignment is equal to size,
which is perfectly reasonable for normal int8/16/32/64/ptr.
However, padding is also represented by ConstType of arbitrary size,
so if we added 157 bytes of padding that becomes alignment of
the padding field and as the result of the whole struct.
This affects very few structs, but quite radically and quite
important structs.
Discovered thanks to syz-check.
Update #590
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Update #590
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Line numbers create huge diffs when lines change slightly.
That's very unhandy b/c we want to look at added/removed warnings.
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syz-check parses vmlinux dwarf, extracts struct descriptions,
compares them with what we have (size, fields, alignment, etc)
and produces .warn files.
This is first raw version, it can be improved in a number of ways.
But it already helped to identify a critical issue #1542
and shows some wrong struct descriptions.
Update #590
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