From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v10 3/3] arm64/syscalls: Check address limit on user-mode return
Date: Wed, 21 Jun 2017 09:16:01 +0100 [thread overview]
Message-ID: <20170621081601.g6fsf6i3mxzar5sn@localhost> (raw)
In-Reply-To: <20170615011203.144108-3-thgarnie@google.com>
On Wed, Jun 14, 2017 at 06:12:03PM -0700, Thomas Garnier wrote:
> Ensure the address limit is a user-mode segment before returning to
> user-mode. Otherwise a process can corrupt kernel-mode memory and
> elevate privileges [1].
>
> The set_fs function sets the TIF_SETFS flag to force a slow path on
> return. In the slow path, the address limit is checked to be USER_DS if
> needed.
>
> [1] https://bugs.chromium.org/p/project-zero/issues/detail?id=990
>
> Signed-off-by: Thomas Garnier <thgarnie@google.com>
> ---
> v10 redesigns the change to use work flags on set_fs as recommended by
> Linus and agreed by others.
>
> Based on next-20170609
> ---
> arch/arm64/include/asm/thread_info.h | 4 +++-
> arch/arm64/include/asm/uaccess.h | 3 +++
> arch/arm64/kernel/signal.c | 5 +++++
> 3 files changed, 11 insertions(+), 1 deletion(-)
For arm64:
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2017-06-21 8:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-15 1:12 [PATCH v10 1/3] x86/syscalls: Check address limit on user-mode return Thomas Garnier
2017-06-15 1:12 ` [PATCH v10 2/3] arm/syscalls: " Thomas Garnier
2017-06-20 20:18 ` Kees Cook
2017-06-20 20:31 ` Thomas Garnier
2017-06-21 9:08 ` Will Deacon
2017-07-18 14:36 ` Leonard Crestez
2017-07-18 16:04 ` Thomas Garnier
2017-07-18 17:18 ` Leonard Crestez
2017-07-18 19:04 ` Thomas Garnier
2017-07-19 14:58 ` Leonard Crestez
2017-07-19 16:51 ` Thomas Garnier
2017-07-19 17:06 ` Russell King - ARM Linux
2017-07-19 17:20 ` [kernel-hardening] " Thomas Garnier
2017-07-19 18:35 ` Russell King - ARM Linux
2017-07-19 18:50 ` Thomas Garnier
2017-06-15 1:12 ` [PATCH v10 3/3] arm64/syscalls: " Thomas Garnier
2017-06-21 8:16 ` Catalin Marinas [this message]
2017-06-21 13:57 ` Thomas Garnier
2017-06-20 20:24 ` [PATCH v10 1/3] x86/syscalls: " Kees Cook
2017-06-28 17:52 ` Kees Cook
2017-07-06 20:38 ` Thomas Garnier
2017-07-06 20:48 ` Thomas Gleixner
2017-07-06 20:52 ` Thomas Garnier
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