From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jeff Xu <jeffxu@google.com>
Cc: jeffxu@chromium.org, akpm@linux-foundation.org,
keescook@chromium.org, jannh@google.com, sroettger@google.com,
willy@infradead.org, gregkh@linuxfoundation.org,
jorgelo@chromium.org, groeck@chromium.org,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-mm@kvack.org, surenb@google.com, alex.sierra@amd.com,
apopple@nvidia.com, aneesh.kumar@linux.ibm.com,
axelrasmussen@google.com, ben@decadent.org.uk,
catalin.marinas@arm.com, david@redhat.com, dwmw@amazon.co.uk,
ying.huang@intel.com, hughd@google.com, joey.gouly@arm.com,
corbet@lwn.net, wangkefeng.wang@huawei.com,
Liam.Howlett@oracle.com, lstoakes@gmail.com,
mawupeng1@huawei.com, linmiaohe@huawei.com, namit@vmware.com,
peterx@redhat.com, peterz@infradead.org, ryan.roberts@arm.com,
shr@devkernel.io, vbabka@suse.cz, xiujianfeng@huawei.com,
yu.ma@intel.com, zhangpeng362@huawei.com, dave.hansen@intel.com,
luto@kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2)
Date: Wed, 18 Oct 2023 11:27:08 -0700 [thread overview]
Message-ID: <CAHk-=wixGw88-OzcFbCLEuAzSe53oUUozdM-E_RJwvejgY6ySA@mail.gmail.com> (raw)
In-Reply-To: <CALmYWFvgM7DOihdUpUC5SREhUMn9t53HYCX+YioeHHhLSD1KHw@mail.gmail.com>
On Wed, 18 Oct 2023 at 10:14, Jeff Xu <jeffxu@google.com> wrote:
>
> There is also alternative approach:
>
> For all the places that call do_vmi_munmap(), find out which
> case should ignore the sealing flag legitimately,
NO.
Christ.
THERE ARE NO LEGITIMATE CASES OF IGNORING SEALING FLAGS.
If you ignore a sealing flag, it's not a sealing flag. It's random
crap, and claiming that it has *anything* to do with security is just
a cruel joke.
Really.
Stop this. I do not want to hear your excuses for garbage any more.
We're done. If I hear any more arguments for this sh*t, I will
literally put you in my ignore file, and will auto-NAK any future
patches.
This is simply not up for discussion. Any flag for "ignore sealing" is wrong.
We do have one special "unmap" case, namely "unmap_vmas()' called at
last mmput() -> __mmput() -> exit_mmap().
And yes, that is called at munmap() time too, but that's after the
point of no return after we've already removed the vma's from the VM
lists. So it's long after any error cases have been checked.
Linus
next prev parent reply other threads:[~2023-10-18 18:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-17 9:08 [RFC PATCH v2 0/8] Introduce mseal() syscall jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 1/8] mseal: Add mseal(2) syscall jeffxu
2023-10-17 15:45 ` Randy Dunlap
2023-10-17 9:08 ` [RFC PATCH v2 2/8] mseal: Wire up mseal syscall jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 3/8] mseal: add can_modify_mm and can_modify_vma jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 4/8] mseal: Check seal flag for mprotect(2) jeffxu
2023-10-17 9:08 ` [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2) jeffxu
2023-10-17 16:54 ` Linus Torvalds
2023-10-18 15:08 ` Jeff Xu
2023-10-18 17:14 ` Jeff Xu
2023-10-18 18:27 ` Linus Torvalds [this message]
2023-10-18 19:07 ` Jeff Xu
2023-10-17 9:08 ` [RFC PATCH v2 6/8] mseal: Check seal flag for mremap(2) jeffxu
2023-10-20 13:56 ` Muhammad Usama Anjum
2023-10-17 9:08 ` [RFC PATCH v2 7/8] mseal:Check seal flag for mmap(2) jeffxu
2023-10-17 17:04 ` Linus Torvalds
2023-10-17 17:43 ` Linus Torvalds
2023-10-18 7:01 ` Jeff Xu
2023-10-19 7:27 ` Stephen Röttger
2023-10-17 9:08 ` [RFC PATCH v2 8/8] selftest mm/mseal mprotect/munmap/mremap/mmap jeffxu
2023-10-20 14:24 ` Muhammad Usama Anjum
2023-10-20 15:23 ` Peter Zijlstra
2023-10-20 16:33 ` Muhammad Usama Anjum
2023-10-19 9:19 ` [RFC PATCH v2 0/8] Introduce mseal() syscall David Laight
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