| title: | Re Unaligned accesses in compat sys msgrcv a |
|
From: Jurij Smakov <jurij@xxxxxxxxx
Date: Fri, 20 Oct 2006 21:11:08 -0700
p = compat_alloc_user_space(second + sizeof(struct msgbuf));
at ipc/compat.c:352 does not guarantee alignment of p, so when we
later try to ldxa from the address &p- mtype (in get_user) or stxa
to &msgp- mtype (in put_user), we catch an exception.
As Im not sure what would be the correct fix here, Id appreciate any
advice on how to deal with that.
compat_alloc_user_space() should round down the pointer it returns
to be 8-byte aligned.
Thanks for catching this, Ill cook up a patch over the weekend.
What application is calling sys_msgrev() during a compile btw?
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