[Bug libsframe/29856] libsframe asan: load misaligned at sframe.c:516

[indu.bhagat at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29856

--- Comment #1 from Indu Bhagat <indu.bhagat at oracle dot com> ---
Thanks for the report. The misaligned load here is for access to an element in
the in-memory abstraction provided by libsframe (namely struct
sframe_frame_row_entry). Now there are ways to resolve that (e.g., reorder
struct members so that they are aligned on their natural boundaries).

SFrame is an unaligned on-disk format. And as I look into this issue, I see
that there are going to be other places where similar issues with unaligned
loads will crop up: e.g., sframe_decode_fre_start_address () which reads 1/2/4
bytes from specific locations in the on-disk binary format section.

So far, I think the latter category can be resolved with usage of memcpy
instead of relying on the compiler generated misaligned loads. Will propose a
patch soon.

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