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From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
To: Jeff Xu <jeffxu@chromium.org>
Cc: Dave Hansen <dave.hansen@intel.com>,
	akpm@linux-foundation.org, keescook@chromium.org,
	jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz,
	lorenzo.stoakes@oracle.com, adhemerval.zanella@linaro.org,
	oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com,
	hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de,
	adobriyan@gmail.com, johannes@sipsolutions.net,
	pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org,
	anna-maria@linutronix.de, mark.rutland@arm.com,
	linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de,
	rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com,
	f.fainelli@gmail.com, gerg@kernel.org,
	dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org,
	mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org,
	ardb@google.com, enh@google.com, rientjes@google.com,
	groeck@chromium.org, mpe@ellerman.id.au,
	aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com
Subject: Re: [PATCH v6 1/7] mseal, system mappings: kernel config and header change
Date: Mon, 24 Feb 2025 14:18:09 -0500	[thread overview]
Message-ID: <gr4i4o7cy2nxah52kiyglzl4ax63zdblvwqvqbdl7vhlfdy3ko@izskzrcapjxq> (raw)
In-Reply-To: <CABi2SkUfABFR+SpjBzHT9dEcsJ0OOHiyttKkQVhqrHLrtZzopA@mail.gmail.com>

* Jeff Xu <jeffxu@chromium.org> [250224 14:07]:
...

> > >
> > > #ifdef CONFIG_64BIT
> > > [ilog2(VM_SEALED)] = "sl",
> > > #endif
> > >
> > > Redefining VM_SEALED  to VM_NONE for 32 bit won't detect the problem
> > > in case that  "#ifdef CONFIG_64BIT" line is missing.
> >
> > I don't think it is reasonable to insist on doing things differently in
> > the kernel because you have external tests that would need updating.
> > These things can change independently, so I don't think this is a valid
> > argument.
> >
> > If these are upstream tests, and we need these tests to work then they
> > can be fixed.
> >
> As above, this is actually kernel code, not test.

Okay, so then they could be easily fixed to work with changing the flags
and it would transparently function in your ChromeOS code base. That's a
good way of doing things.

It doesn't make sense here since, as stated in this thread, we need two
defines.  But it does mean we are less locked into how this functions
and it could change later, if needed.

Also, do we need something like the above test for VM_SEALED_SYS?

Thanks,
Liam



  reply	other threads:[~2025-02-24 19:18 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-02-24 17:45 [PATCH v6 0/7] mseal system mappings jeffxu
2025-02-24 17:45 ` [PATCH v6 1/7] mseal, system mappings: kernel config and header change jeffxu
2025-02-24 18:21   ` Dave Hansen
2025-02-24 18:44     ` Jeff Xu
2025-02-24 18:52       ` Dave Hansen
2025-02-24 18:55         ` Kees Cook
2025-02-24 18:59           ` Jeff Xu
2025-02-24 19:02           ` Dave Hansen
2025-02-24 19:10           ` Liam R. Howlett
2025-02-24 19:22             ` Jeff Xu
2025-02-24 19:32               ` Liam R. Howlett
2025-02-24 19:33                 ` Jeff Xu
2025-02-24 19:26             ` Kees Cook
2025-02-24 19:34               ` Jeff Xu
2025-02-24 19:03       ` Liam R. Howlett
2025-02-24 19:07         ` Jeff Xu
2025-02-24 19:18           ` Liam R. Howlett [this message]
2025-02-24 19:39             ` Jeff Xu
2025-02-24 20:13               ` Liam R. Howlett
2025-02-24 19:10         ` Jeff Xu
2025-02-24 19:25           ` Kees Cook
2025-02-24 19:42             ` Jeff Xu
2025-02-24 20:12               ` Liam R. Howlett
2025-02-24 21:08                 ` Jeff Xu
2025-02-24 17:45 ` [PATCH v6 2/7] selftests: x86: test_mremap_vdso: skip if vdso is msealed jeffxu
2025-02-24 19:02   ` Kees Cook
2025-02-24 21:04   ` Liam R. Howlett
2025-02-24 21:24     ` Jeff Xu
2025-02-24 17:45 ` [PATCH v6 3/7] mseal, system mappings: enable x86-64 jeffxu
2025-02-24 21:06   ` Liam R. Howlett
2025-02-24 17:45 ` [PATCH v6 4/7] mseal, system mappings: enable arm64 jeffxu
2025-02-24 17:45 ` [PATCH v6 5/7] mseal, system mappings: enable uml architecture jeffxu
2025-02-24 17:45 ` [PATCH v6 6/7] mseal, system mappings: uprobe mapping jeffxu
2025-02-24 17:45 ` [PATCH v6 7/7] mseal, system mappings: update mseal.rst jeffxu
2025-02-24 19:04   ` Kees Cook
2025-02-24 20:26   ` Liam R. Howlett
2025-02-24 21:06     ` Jeff Xu
2025-02-24 21:54       ` Jeff Xu
2025-02-25  6:07   ` Lorenzo Stoakes
2025-02-25 22:31     ` Jeff Xu
2025-02-25 22:36       ` Jeff Xu
2025-02-26  6:08         ` Lorenzo Stoakes
2025-02-26  5:27       ` Lorenzo Stoakes

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