* Redundant barrier_nospec() added by commit 74e19ef0ff80 ("uaccess: Add speculation barrier to copy_from_user()")
@ 2025-06-19 8:42 Christophe Leroy
0 siblings, 0 replies; only message in thread
From: Christophe Leroy @ 2025-06-19 8:42 UTC (permalink / raw)
To: Dave Hansen
Cc: Linus Torvalds, Thomas Gleixner, Daniel Borkmann,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Hello Dave,
In commit 74e19ef0ff80 ("uaccess: Add speculation barrier to
copy_from_user()") you add barrier_nospec() to copy_from_user().
There is already a barrier_nospec() in allow_read_from_user() which is
called by raw_copy_from_user(), see commit 8524e2e76441
("powerpc/uaccess: Perform barrier_nospec() in KUAP allowance helpers").
Why do you need an additional one ?
And why only copy_from_user() and not also other places like
copy_from_user_iter() for instance ?
Thanks
Christophe
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2025-06-19 8:42 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-06-19 8:42 Redundant barrier_nospec() added by commit 74e19ef0ff80 ("uaccess: Add speculation barrier to copy_from_user()") Christophe Leroy
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).