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>,
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>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v8 4/8] mm, arm64: untag user addresses in mm/gup.c
Date: Thu, 8 Nov 2018 15:36:11 +0100 [thread overview]
Message-ID: <f4c83a89817a81d741373d3fb529864d3a3bd61e.1541687720.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1541687720.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 f76e77a2d34b..6ff310818616 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -677,6 +677,8 @@ 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));
/*
@@ -840,6 +842,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
struct vm_area_struct *vma;
vm_fault_t ret, major = 0;
+ address = untagged_addr(address);
+
if (unlocked)
fault_flags |= FAULT_FLAG_ALLOW_RETRY;
--
2.19.1.930.g4563a0d9d0-goog
next prev parent reply other threads:[~2018-11-08 14:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 14:36 [PATCH v8 0/8] arm64: untag user pointers passed to the kernel Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 1/8] arm64: add type casts to untagged_addr macro Andrey Konovalov
2018-11-29 18:22 ` Catalin Marinas
2018-12-06 12:34 ` Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 2/8] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2018-11-29 18:23 ` Catalin Marinas
2018-12-06 12:36 ` Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 3/8] arm64: untag user addresses in access_ok and __uaccess_mask_ptr Andrey Konovalov
2018-11-29 18:24 ` Catalin Marinas
2018-11-08 14:36 ` Andrey Konovalov [this message]
2018-11-08 14:36 ` [PATCH v8 5/8] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 6/8] fs, arm64: untag user address in copy_mount_options Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 7/8] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2018-11-08 14:36 ` [PATCH v8 8/8] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2018-11-08 14:48 ` [PATCH v8 0/8] arm64: untag user pointers passed to the kernel Andrey Konovalov
2018-11-29 18:16 ` Catalin Marinas
2018-12-06 12:44 ` Andrey Konovalov
2018-12-06 14:08 ` Catalin Marinas
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