From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Andrey Konovalov <andreyknvl@google.com>,
Kees Cook <keescook@chromium.org>,
Kate Stewart <kstewart@linuxfoundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Shuah Khan <shuah@kernel.org>,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Chintan Pandya <cpandya@codeaurora.org>
Subject: [PATCH v5 04/10] mm, arm64: untag user addresses in mm/gup.c
Date: Mon, 6 Aug 2018 18:40:39 +0200 [thread overview]
Message-ID: <64762ca688f8611c38cf6a8c8bf50a75d9f2fa3a.1533573460.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1533573460.git.andreyknvl@google.com>
mm/gup.c provides a kernel interface that accepts user addresses and
manipulates user pages directly (for example get_user_pages, that is used
by the futex syscall). Since a user can provided tagged addresses, we need
to handle such case.
Add untagging to gup.c functions that use user addresses for vma lookup.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
mm/gup.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/gup.c b/mm/gup.c
index fc5f98069f4e..ebb87fb56709 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -666,6 +666,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (!nr_pages)
return 0;
+ start = untagged_addr(start);
+
VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET));
/*
@@ -820,6 +822,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
struct vm_area_struct *vma;
int ret, major = 0;
+ address = untagged_addr(address);
+
if (unlocked)
fault_flags |= FAULT_FLAG_ALLOW_RETRY;
--
2.18.0.597.ga71716f1ad-goog
next prev parent reply other threads:[~2018-08-06 16:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-06 16:40 [PATCH v5 00/10] arm64: untag user pointers passed to the kernel Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 01/10] arm64: add type casts to untagged_addr macro Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 02/10] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 03/10] arm64: untag user addresses in access_ok and __uaccess_mask_ptr Andrey Konovalov
2018-08-06 16:40 ` Andrey Konovalov [this message]
2018-08-06 16:40 ` [PATCH v5 05/10] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 06/10] arm64: untag user address in __do_user_fault Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 07/10] fs, arm64: untag user address in copy_mount_options Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 08/10] usb, arm64: untag user addresses in devio Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 09/10] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2018-08-06 16:40 ` [PATCH v5 10/10] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=64762ca688f8611c38cf6a8c8bf50a75d9f2fa3a.1533573460.git.andreyknvl@google.com \
--to=andreyknvl@google.com \
--cc=Jacob.Bramley@arm.com \
--cc=Lee.Smith@arm.com \
--cc=Ramana.Radhakrishnan@arm.com \
--cc=Ruben.Ayrapetyan@arm.com \
--cc=akpm@linux-foundation.org \
--cc=catalin.marinas@arm.com \
--cc=cpandya@codeaurora.org \
--cc=dvyukov@google.com \
--cc=eugenis@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=kcc@google.com \
--cc=keescook@chromium.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=kstewart@linuxfoundation.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mark.rutland@arm.com \
--cc=mingo@kernel.org \
--cc=robin.murphy@arm.com \
--cc=shuah@kernel.org \
--cc=viro@zeniv.linux.org.uk \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).