On Apr 11 2022, Linus Torvalds wrote:
>> For me, the failure happens in cp_compat_stat (I have a 64-bit kernel). In
>> struct compat_stat in arch/x86/include/asm/compat.h, st_dev and st_rdev
>> are compat_dev_t which is 16-bit. But they are followed by 16-bit
>> paddings, so they could be extended.
>
> Ok, that actually looks like a bug.
>
> The compat structure should match the native structure. Those "u16
> __padX" fields seem to be just a symptom of the bug.
Looks like the move to 32-bit st_[r]dev was never applied to struct
compat_stat, see commit e95b206567 ("[PATCH] struct stat - support
larger dev_t") from tglx/history.git.
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Andreas Schwab, schwab@xxxxxxxxxxxxxx
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