m68k: nommu: fix memmove() with differently aligned src and dest for 68000

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[ Upstream commit 590fe2f46c ]

68000 has different alignment needs to 68020+.
memcpy() checks if the destination is aligned and does a smaller copy
to fix the alignment and then critically for 68000 it checks if the
source is still unaligned and if it is reverts to smaller copies.

memmove() does not currently do the second part and malfunctions if
one of the pointers is aligned and the other isn't.

This is apparently getting triggered by printk. If I put breakpoints
into the new checks added by this commit the first hit looks like this:

memmove (n=205, src=0x2f3971 <printk_shared_pbufs+205>, dest=0x2f3980 <printk_shared_pbufs+220>) at arch/m68k/lib/memmove.c:82

Signed-off-by: Daniel Palmer <daniel@thingy.jp>
Signed-off-by: Greg Ungerer <gerg@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Daniel Palmer 2025-12-13 21:04:01 +09:00 • committed by Sasha Levin

parent bc775cc7c0

commit edc3261ceb

1 changed files with 18 additions and 0 deletions

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arch/m68k/lib/memmove.c

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