From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org, will.deacon@arm.com
Cc: linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
dave.martin@arm.com, hch@infradead.org, james.morse@arm.com,
linux@dominikbrodowski.net, linux-fsdevel@vger.kernel.org,
marc.zyngier@arm.com, mark.rutland@arm.com,
viro@zeniv.linux.org.uk
Subject: [PATCHv4 00/19] arm64: invoke syscalls with pt_regs
Date: Mon, 2 Jul 2018 12:03:56 +0100 [thread overview]
Message-ID: <20180702110415.10465-1-mark.rutland@arm.com> (raw)
This series reworks arm64's syscall handling to minimize the propagation
of user-controlled register values into speculated code paths. As with
x86 [1], a wrapper is generated for each syscall, which extracts the
argument from a struct pt_regs. During kernel entry from userspace,
registers are zeroed.
The arm64 kernel code directly invokes some syscalls which the x86 code
doesn't, so I've added ksys_* wrappers for these, following the x86
example. The rest of the series is arm64-specific.
I've pushed the series out to my arm64/syscall-regs branch [2] on
kernel.org.
Since v1 [3]:
* Rebase atop of arm64 for-next/core (for SSBD conflicts)
* Move ksys_personality logic into <linux/syscalls.h>
* Move kcompat_sys_* wrappers to <linux/compat.h>
* Fix scno bounds check to use unsigned comparison
* Fix sve_user_reset() call in el0_svc_handler()
* Add BUILD_BUG() to the !CONFIG_ARM64_SVE stubs
* Accumulate acked-by / reviewed-by tags
Since v2 [4]:
* Rebase to v4.18-rc1
* Take upper 32 RES0 bits of SCTLR_ELx into account
* Accumulate acks
Since v3 [5]:
* Rebase to v4.18-rc3 to avoid conflict with FPSIMD/SVE fixes
* Accumulate acks / reviewed-by tags
* Rework __invoke_syscall() for consistency with do_ni_syscall()
* Rename sve_user_reset() to sve_user_discard()
* Tidied up comment placement
* Typo fixes
Thanks,
Mark.
[1] https://lkml.kernel.org/r/20180330093720.6780-1-linux@dominikbrodowski.net
[2] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
[3] https://lkml.kernel.org/r/20180514094640.27569-1-mark.rutland@arm.com
[4] https://lkml.kernel.org/r/20180601112441.37810-1-mark.rutland@arm.com
[5] https://lkml.kernel.org/r/20180618120310.39527-1-mark.rutland@arm.com
Mark Rutland (19):
arm64: consistently use unsigned long for thread flags
arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h>
arm64: kill config_sctlr_el1()
arm64: kill change_cpacr()
arm64: move sve_user_{enable,disable} to <asm/fpsimd.h>
arm64: remove sigreturn wrappers
arm64: convert raw syscall invocation to C
arm64: convert syscall trace logic to C
arm64: convert native/compat syscall entry to C
arm64: don't restore GPRs when context tracking
arm64: don't reload GPRs after apply_ssbd
arm64: zero GPRs upon entry from EL0
kernel: add ksys_personality()
kernel: add kcompat_sys_{f,}statfs64()
arm64: remove in-kernel call to sys_personality()
arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn
arm64: use SYSCALL_DEFINE6() for mmap
arm64: convert compat wrappers to C
arm64: implement syscall wrappers
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/fpsimd.h | 17 +++-
arch/arm64/include/asm/syscall_wrapper.h | 80 ++++++++++++++++
arch/arm64/include/asm/sysreg.h | 30 ++----
arch/arm64/include/asm/unistd32.h | 26 ++---
arch/arm64/kernel/Makefile | 5 +-
arch/arm64/kernel/armv8_deprecated.c | 8 +-
arch/arm64/kernel/cpu_errata.c | 3 +-
arch/arm64/kernel/entry.S | 157 ++++---------------------------
arch/arm64/kernel/entry32.S | 121 ------------------------
arch/arm64/kernel/fpsimd.c | 19 ----
arch/arm64/kernel/signal.c | 5 +-
arch/arm64/kernel/signal32.c | 6 +-
arch/arm64/kernel/sys.c | 19 ++--
arch/arm64/kernel/sys32.c | 127 ++++++++++++++++++++++---
arch/arm64/kernel/syscall.c | 137 +++++++++++++++++++++++++++
arch/arm64/kernel/traps.c | 18 +---
arch/arm64/mm/fault.c | 2 +-
fs/statfs.c | 14 ++-
include/linux/compat.h | 11 +++
include/linux/syscalls.h | 11 +++
21 files changed, 453 insertions(+), 364 deletions(-)
create mode 100644 arch/arm64/include/asm/syscall_wrapper.h
delete mode 100644 arch/arm64/kernel/entry32.S
create mode 100644 arch/arm64/kernel/syscall.c
--
2.11.0
next reply other threads:[~2018-07-02 11:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 11:03 Mark Rutland [this message]
2018-07-02 11:03 ` [PATCHv4 01/19] arm64: consistently use unsigned long for thread flags Mark Rutland
2018-07-02 11:03 ` [PATCHv4 02/19] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> Mark Rutland
2018-07-02 11:03 ` [PATCHv4 03/19] arm64: kill config_sctlr_el1() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 04/19] arm64: kill change_cpacr() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 05/19] arm64: move sve_user_{enable,disable} to <asm/fpsimd.h> Mark Rutland
2018-07-02 11:04 ` [PATCHv4 06/19] arm64: remove sigreturn wrappers Mark Rutland
2018-07-02 11:04 ` [PATCHv4 07/19] arm64: convert raw syscall invocation to C Mark Rutland
2018-07-02 11:04 ` [PATCHv4 08/19] arm64: convert syscall trace logic " Mark Rutland
2018-07-02 11:04 ` [PATCHv4 09/19] arm64: convert native/compat syscall entry " Mark Rutland
2018-07-02 11:04 ` [PATCHv4 10/19] arm64: don't restore GPRs when context tracking Mark Rutland
2018-07-02 11:04 ` [PATCHv4 11/19] arm64: don't reload GPRs after apply_ssbd Mark Rutland
2018-07-06 16:38 ` Will Deacon
2018-07-09 14:21 ` Mark Rutland
2018-07-10 10:37 ` Dave Martin
2018-07-10 17:33 ` Will Deacon
2018-07-11 9:46 ` Mark Rutland
2018-07-02 11:04 ` [PATCHv4 12/19] arm64: zero GPRs upon entry from EL0 Mark Rutland
2018-07-02 11:04 ` [PATCHv4 13/19] kernel: add ksys_personality() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 14/19] kernel: add kcompat_sys_{f,}statfs64() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 15/19] arm64: remove in-kernel call to sys_personality() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 16/19] arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn Mark Rutland
2018-07-02 11:04 ` [PATCHv4 17/19] arm64: use SYSCALL_DEFINE6() for mmap Mark Rutland
2018-07-02 11:04 ` [PATCHv4 18/19] arm64: convert compat wrappers to C Mark Rutland
2018-07-02 11:04 ` [PATCHv4 19/19] arm64: implement syscall wrappers Mark Rutland
2018-07-06 16:42 ` [PATCHv4 00/19] arm64: invoke syscalls with pt_regs Will Deacon
2018-07-10 10:39 ` Will Deacon
2018-07-11 10:47 ` Mark Rutland
2018-07-11 12:27 ` Will Deacon
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