From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: 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: Alexander Viro <viro@zeniv.linux.org.uk>,
Alexei Starovoitov <ast@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andrey Konovalov <andreyknvl@google.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Dave Martin <Dave.Martin@arm.com>,
"David S. Miller" <davem@davemloft.net>,
Dmitry Vyukov <dvyukov@google.com>,
Eric Dumazet <edumazet@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Graeme Barnes <Graeme.Barnes@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ingo Molnar <mingo@kernel.org>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Kate Stewart <kstewart@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Kostya Serebryany <kcc@google.com>, Lee Smith <Lee.Smith@arm.com>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Mark Rutland <mark.rutland@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Shuah Khan <shuah@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
Will Deacon <will.deacon@arm.com>
Subject: [PATCH v2 4/4] arm64: elf: Advertise relaxed ABI
Date: Mon, 18 Mar 2019 16:35:33 +0000 [thread overview]
Message-ID: <20190318163533.26838-5-vincenzo.frascino@arm.com> (raw)
In-Reply-To: <20190318163533.26838-1-vincenzo.frascino@arm.com>
On arm64 the TCR_EL1.TBI0 bit has been always enabled hence
the userspace (EL0) is allowed to set a non-zero value in the top
byte but the resulting pointers are not allowed at the user-kernel
syscall ABI boundary.
Set ARM64_AT_FLAGS_SYSCALL_TBI (bit[0]) in the AT_FLAGS to advertise
the relaxation of the ABI to the userspace.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
CC: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
arch/arm64/include/asm/atflags.h | 7 +++++++
arch/arm64/include/asm/elf.h | 5 +++++
arch/arm64/include/uapi/asm/atflags.h | 8 ++++++++
3 files changed, 20 insertions(+)
create mode 100644 arch/arm64/include/asm/atflags.h
create mode 100644 arch/arm64/include/uapi/asm/atflags.h
diff --git a/arch/arm64/include/asm/atflags.h b/arch/arm64/include/asm/atflags.h
new file mode 100644
index 000000000000..b20093d61bf2
--- /dev/null
+++ b/arch/arm64/include/asm/atflags.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ATFLAGS_H
+#define __ASM_ATFLAGS_H
+
+#include <uapi/asm/atflags.h>
+
+#endif
diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
index 6adc1a90e7e6..73d5184a4dd9 100644
--- a/arch/arm64/include/asm/elf.h
+++ b/arch/arm64/include/asm/elf.h
@@ -16,6 +16,7 @@
#ifndef __ASM_ELF_H
#define __ASM_ELF_H
+#include <asm/atflags.h>
#include <asm/hwcap.h>
/*
@@ -167,6 +168,10 @@ do { \
NEW_AUX_ENT(AT_IGNORE, 0); \
} while (0)
+/* Platform specific AT_FLAGS */
+#define ELF_AT_FLAGS ARM64_AT_FLAGS_SYSCALL_TBI
+#define COMPAT_ELF_AT_FLAGS 0
+
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
diff --git a/arch/arm64/include/uapi/asm/atflags.h b/arch/arm64/include/uapi/asm/atflags.h
new file mode 100644
index 000000000000..1cf25692ffd6
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/atflags.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UAPI_ASM_ATFLAGS_H
+#define __UAPI_ASM_ATFLAGS_H
+
+/* Platform specific AT_FLAGS */
+#define ARM64_AT_FLAGS_SYSCALL_TBI (1 << 0)
+
+#endif
--
2.21.0
prev parent reply other threads:[~2019-03-18 16:36 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-15 19:51 [PATCH v11 00/14] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 01/14] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 02/14] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 03/14] lib, arm64: untag user pointers in strn*_user Andrey Konovalov
2019-03-18 11:33 ` Kevin Brodsky
2019-03-15 19:51 ` [PATCH v11 04/14] mm, arm64: untag user pointers passed to memory syscalls Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 05/14] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 06/14] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 07/14] fs, arm64: untag user pointers in fs/userfaultfd.c Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 08/14] net, arm64: untag user pointers in tcp_zerocopy_receive Andrey Konovalov
2019-03-15 20:03 ` Eric Dumazet
2019-03-18 13:14 ` Andrey Konovalov
2019-03-18 13:16 ` Andrey Konovalov
2019-03-18 14:44 ` Eric Dumazet
2019-03-18 16:08 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 09/14] kernel, arm64: untag user pointers in prctl_set_mm* Andrey Konovalov
2019-03-18 11:47 ` Kevin Brodsky
2019-03-18 16:53 ` Andrey Konovalov
[not found] ` <201903170317.IWsOYXBe%lkp@intel.com>
2019-03-18 16:53 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 10/14] tracing, arm64: untag user pointers in seq_print_user_ip Andrey Konovalov
2019-03-15 20:14 ` Steven Rostedt
2019-03-18 13:11 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 11/14] uprobes, arm64: untag user pointers in find_active_uprobe Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 12/14] bpf, arm64: untag user pointers in stack_map_get_build_id_offset Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 13/14] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2019-03-18 13:26 ` Kevin Brodsky
2019-03-18 16:59 ` Andrey Konovalov
2019-03-15 19:51 ` [PATCH v11 14/14] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-03-18 16:35 ` [PATCH v2 0/4] arm64 relaxed ABI Vincenzo Frascino
2019-03-18 16:35 ` [PATCH v2 1/4] elf: Make AT_FLAGS arch configurable Vincenzo Frascino
2019-03-18 16:35 ` [PATCH v2 2/4] arm64: Define Documentation/arm64/elf_at_flags.txt Vincenzo Frascino
2019-03-22 6:22 ` Amit Daniel Kachhap
2019-03-22 10:48 ` Catalin Marinas
2019-03-22 15:52 ` Kevin Brodsky
2019-04-03 16:50 ` Catalin Marinas
2019-04-12 14:16 ` Kevin Brodsky
2019-03-18 16:35 ` [PATCH v2 3/4] arm64: Relax Documentation/arm64/tagged-pointers.txt Vincenzo Frascino
2019-03-18 16:35 ` Vincenzo Frascino [this message]
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