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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: Chintan Pandya <cpandya@codeaurora.org>,
	Jacob Bramley <Jacob.Bramley@arm.com>,
	Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Lee Smith <Lee.Smith@arm.com>, Kostya Serebryany <kcc@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
	Evgeniy Stepanov <eugenis@google.com>
Subject: [PATCH v9 5/8] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
Date: Mon, 10 Dec 2018 13:51:02 +0100
Message-ID: <2c573564b456327708d175f3124256bc71081bd8.1544445454.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1544445454.git.andreyknvl@google.com>

strncpy_from_user and strnlen_user accept user addresses as arguments, and
do not go through the same path as copy_from_user and others, so here we
need to handle the case of tagged user addresses separately.

Untag user pointers passed to these functions.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 lib/strncpy_from_user.c | 2 ++
 lib/strnlen_user.c      | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c
index b53e1b5d80f4..97467cd2bc59 100644
--- a/lib/strncpy_from_user.c
+++ b/lib/strncpy_from_user.c
@@ -106,6 +106,8 @@ long strncpy_from_user(char *dst, const char __user *src, long count)
 	if (unlikely(count <= 0))
 		return 0;
 
+	src = untagged_addr(src);
+
 	max_addr = user_addr_max();
 	src_addr = (unsigned long)src;
 	if (likely(src_addr < max_addr)) {
diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
index 60d0bbda8f5e..8b5f56466e00 100644
--- a/lib/strnlen_user.c
+++ b/lib/strnlen_user.c
@@ -108,6 +108,8 @@ long strnlen_user(const char __user *str, long count)
 	if (unlikely(count <= 0))
 		return 0;
 
+	str = untagged_addr(str);
+
 	max_addr = user_addr_max();
 	src_addr = (unsigned long)str;
 	if (likely(src_addr < max_addr)) {
-- 
2.20.0.rc2.403.gdbc3b29805-goog


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  parent reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10 12:50 [PATCH v9 0/8] arm64: untag user pointers passed to the kernel Andrey Konovalov
2018-12-10 12:50 ` [PATCH v9 1/8] arm64: add type casts to untagged_addr macro Andrey Konovalov
2018-12-10 12:50 ` [PATCH v9 2/8] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2018-12-10 12:51 ` [PATCH v9 3/8] arm64: untag user addresses in access_ok and __uaccess_mask_ptr Andrey Konovalov
2018-12-10 12:51 ` [PATCH v9 4/8] mm, arm64: untag user addresses in mm/gup.c Andrey Konovalov
2018-12-10 12:51 ` Andrey Konovalov [this message]
2018-12-10 12:51 ` [PATCH v9 6/8] fs, arm64: untag user address in copy_mount_options Andrey Konovalov
2018-12-10 12:51 ` [PATCH v9 7/8] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2018-12-10 12:51 ` [PATCH v9 8/8] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2018-12-10 14:30 ` [RFC][PATCH 0/3] arm64 relaxed ABI Vincenzo Frascino
2018-12-10 14:30   ` [RFC][PATCH 1/3] elf: Make AT_FLAGS arch configurable Vincenzo Frascino
2018-12-10 14:30   ` [RFC][PATCH 2/3] arm64: Define Documentation/arm64/elf_at_flags.txt Vincenzo Frascino
2018-12-12 17:34     ` Dave Martin
2019-01-09 13:05       ` Vincenzo Frascino
2018-12-10 14:30   ` [RFC][PATCH 3/3] arm64: elf: Advertise relaxed ABI Vincenzo Frascino
2018-12-12 14:23   ` [RFC][PATCH 0/3] arm64 " Andrey Konovalov
2018-12-12 15:02     ` Catalin Marinas
2018-12-18 15:03       ` Andrey Konovalov
2018-12-18 17:59         ` Catalin Marinas
2018-12-19 12:52           ` Dave Martin
2019-02-11 17:28             ` Kevin Brodsky
2019-02-11 20:32               ` Evgenii Stepanov
2019-02-12 18:02                 ` Catalin Marinas
2019-02-13 14:58                   ` Dave Martin
2019-02-13 16:42                     ` Kevin Brodsky
2019-02-13 17:43                       ` Dave Martin
2019-02-13 21:41                         ` Evgenii Stepanov
2019-02-14 11:22                           ` Kevin Brodsky
2019-02-19 18:38                   ` Szabolcs Nagy
2019-02-25 16:57                     ` Catalin Marinas
2019-02-25 18:02                       ` Szabolcs Nagy
2019-02-26 17:30                         ` Kevin Brodsky
2018-12-12 17:01 ` [PATCH v9 0/8] arm64: untag user pointers passed to the kernel Dave Martin
2018-12-18 17:17   ` Andrey Konovalov
2019-02-11 11:35   ` Catalin Marinas
2019-02-11 17:02     ` Dave Martin

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