Thread (3 messages) 3 messages, 3 authors, 2021-05-18

Re: [PATCH v3 1/4] kexec: simplify compat_sys_kexec_load

From: Christoph Hellwig <hch@infradead.org>
Date: 2021-05-18 06:41:53
Also in: kexec, linux-arm-kernel, linux-mm, lkml

Possibly related (same subject, not in this thread)

On Mon, May 17, 2021 at 10:57:24PM -0500, Eric W. Biederman wrote:
We open ourselves up to bugs whenever we lie to the type system.

Skimming through the code it looks like it should be possible
to not need the in_compat_syscall and the casts to the wrong
type by changing the order of the code a little bit.
What kind of bug do you expect?  We must only copy from user addresses
once anyway.  I've never seen bugs due the use of in_compat_syscall,
but plenty due to cruft code trying to avoid it.
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