Re: [GIT PULL] ARM: support THREAD_INFO_IN_TASK
flat view
From: Kees Cook <hidden>
Date: 2021-10-11 17:24:53
On Sun, Oct 10, 2021 at 09:50:52AM +0200, Ard Biesheuvel wrote:
On Mon, 27 Sept 2021 at 17:06, Ard Biesheuvel [off-list ref] wrote:quoted
The following changes since commit 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f: Linux 5.15-rc1 (2021-09-12 16:28:37 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git tags/pr-arm32-ti-in-task for you to fetch changes up to 18ed1c01a7dd3d7c780b06a49124da237a4c1790: ARM: smp: Enable THREAD_INFO_IN_TASK (2021-09-27 16:54:02 +0200) ---------------------------------------------------------------- ARM: support THREAD_INFO_IN_TASK Move thread_info off the stack and into the task struct, as is done by many other architectures. This requires a method to find the task struct of the task currently running on the CPU, which is provided in this case by the user space TLS (Thread Local Storage) register. This implies that the feature is only supported on CPUs that implement this register, i.e., ARM v6k or later. Kindly tested by Amit and reviewed by Linus. The first patch is against the GCC plugins subsystem, but was reviewed by the maintainer and can be taken through the ARM tree. ----------------------------------------------------------------Ping?
As this is a prerequisite for the IRQ stack work and it's been Reviewed/Tested-by already, I could carry this series for -next. Maybe that would help? -Kees
quoted
Cc: Keith Packard <redacted> Cc: Kees Cook <redacted> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Amit Daniel Kachhap <redacted> Cc: Linus Walleij <redacted> Ard Biesheuvel (4): gcc-plugins: arm-ssp: Prepare for THREAD_INFO_IN_TASK support ARM: smp: Free up the TLS register while running in the kernel ARM: smp: Store current pointer in TPIDRURO register if available ARM: smp: Enable THREAD_INFO_IN_TASK Keith Packard (1): ARM: smp: Pass task to secondary_start_kernel arch/arm/Kconfig | 8 ++++- arch/arm/Makefile | 9 ++--- arch/arm/include/asm/assembler.h | 29 ++++++++++++++++ arch/arm/include/asm/current.h | 50 +++++++++++++++++++++++++++ arch/arm/include/asm/smp.h | 3 +- arch/arm/include/asm/stackprotector.h | 2 -- arch/arm/include/asm/switch_to.h | 16 +++++++++ arch/arm/include/asm/thread_info.h | 15 +++++--- arch/arm/include/asm/tls.h | 10 ++++-- arch/arm/kernel/asm-offsets.c | 6 ++-- arch/arm/kernel/entry-armv.S | 5 +++ arch/arm/kernel/entry-common.S | 1 + arch/arm/kernel/entry-header.S | 8 +++++ arch/arm/kernel/head-common.S | 5 +++ arch/arm/kernel/head-nommu.S | 1 + arch/arm/kernel/head.S | 5 +-- arch/arm/kernel/process.c | 8 ++--- arch/arm/kernel/smp.c | 13 +++++-- arch/arm/mm/proc-macros.S | 3 +- scripts/gcc-plugins/arm_ssp_per_task_plugin.c | 27 ++++----------- 20 files changed, 174 insertions(+), 50 deletions(-) create mode 100644 arch/arm/include/asm/current.h _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
-- Kees Cook _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel