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SubjectRe: [PATCH v15 00/13] powerpc: Switch to CONFIG_THREAD_INFO_IN_TASK
Date
Christophe Leroy <christophe.leroy@c-s.fr> writes:

> The purpose of this serie is to activate CONFIG_THREAD_INFO_IN_TASK which
> moves the thread_info into task_struct.

Hi Christophe,

I've taken this series and split some of the patches up a bit more.

I'll just run it through some tests and then post my version.

cheers


> Moving thread_info into task_struct has the following advantages:
> - It protects thread_info from corruption in the case of stack
> overflows.
> - Its address is harder to determine if stack addresses are
> leaked, making a number of attacks more difficult.
>
> Changes in v15:
> - switched patch 1 and 2.
> - resync patch 1 with linux/next. As memblock modifications are now fully merged in
> linux-mm tree, this patch voids as soon as linux-mm gets merged into powerpc/merge branch
> - Fixed build failure on 64le due to call to __save_stack_trace_tsk_reliable() (patch 5)
> - Taken the renaming of THREAD_INFO to TASK_STACK out of the preparation patch to ease review (hence new patch 6)
> - Fixed one place where r11 (physical address of stack) was used instead of r1 to locate
> thread_info, inducing a bug when switching to r2 which is virtual address of current (patch 7)
> - Keeping physical address of current in r2 until MMU translation is reactivated (patch 11)
>
> Changes in v14 (ie since v13):
> - Added in front a fixup patch which conflicts with this serie
> - Added a patch for using try_get_task_stack()/put_task_stack() in stack walkers.
> - Fixed compilation failure in the preparation patch (by moving the modification
> of klp_init_thread_info() to the following patch)
>
> Changes since v12:
> - Patch 1: Taken comment from Mike (re-introduced the 'panic' in case memblock allocation fails in setup_64.c
> - Patch 1: Added alloc_stack() function in setup_32.c to also panic in case of allocation failure.
>
> Changes since v11:
> - Rebased on 81775f5563fa ("Automatic merge of branches 'master', 'next' and 'fixes' into merge")
> - Added a first patch to change memblock allocs to functions returning virtual addrs. This removes
> the memset() which were the only remaining stuff in irq_ctx_init() and exc_lvl_ctx_init() at the end.
> - dropping irq_ctx_init() and exc_lvl_ctx_init() in patch 5 (powerpc: Activate CONFIG_THREAD_INFO_IN_TASK)
> - A few cosmetic changes in commit log and code.
>
> Changes since v10:
> - Rebased on 21622a0d2023 ("Automatic merge of branches 'master', 'next' and 'fixes' into merge")
> ==> Fixed conflict in setup_32.S
>
> Changes since v9:
> - Rebased on 183cbf93be88 ("Automatic merge of branches 'master', 'next' and 'fixes' into merge")
> ==> Fixed conflict on xmon
>
> Changes since v8:
> - Rebased on e589b79e40d9 ("Automatic merge of branches 'master', 'next' and 'fixes' into merge")
> ==> Main impact was conflicts due to commit 9a8dd708d547 ("memblock: rename memblock_alloc{_nid,_try_nid} to memblock_phys_alloc*")
>
> Changes since v7:
> - Rebased on fb6c6ce7907d ("Automatic merge of branches 'master', 'next' and 'fixes' into merge")
>
> Changes since v6:
> - Fixed validate_sp() to exclude NULL sp in 'regain entire stack space' patch (early crash with CONFIG_KMEMLEAK)
>
> Changes since v5:
> - Fixed livepatch_sp setup by using end_of_stack() instead of hardcoding
> - Fixed PPC_BPF_LOAD_CPU() macro
>
> Changes since v4:
> - Fixed a build failure on 32bits SMP when include/generated/asm-offsets.h is not
> already existing, was due to spaces instead of a tab in the Makefile
>
> Changes since RFC v3: (based on Nick's review)
> - Renamed task_size.h to task_size_user64.h to better relate to what it contains.
> - Handling of the isolation of thread_info cpu field inside CONFIG_SMP #ifdefs moved to a separate patch.
> - Removed CURRENT_THREAD_INFO macro completely.
> - Added a guard in asm/smp.h to avoid build failure before _TASK_CPU is defined.
> - Added a patch at the end to rename 'tp' pointers to 'sp' pointers
> - Renamed 'tp' into 'sp' pointers in preparation patch when relevant
> - Fixed a few commit logs
> - Fixed checkpatch report.
>
> Changes since RFC v2:
> - Removed the modification of names in asm-offsets
> - Created a rule in arch/powerpc/Makefile to append the offset of current->cpu in CFLAGS
> - Modified asm/smp.h to use the offset set in CFLAGS
> - Squashed the renaming of THREAD_INFO to TASK_STACK in the preparation patch
> - Moved the modification of current_pt_regs in the patch activating CONFIG_THREAD_INFO_IN_TASK
>
> Changes since RFC v1:
> - Removed the first patch which was modifying header inclusion order in timer
> - Modified some names in asm-offsets to avoid conflicts when including asm-offsets in C files
> - Modified asm/smp.h to avoid having to include linux/sched.h (using asm-offsets instead)
> - Moved some changes from the activation patch to the preparation patch.
>
> Christophe Leroy (13):
> powerpc/irq: use memblock functions returning virtual address
> powerpc/32: Fix CONFIG_VIRT_CPU_ACCOUNTING_NATIVE for 40x/booke
> book3s/64: avoid circular header inclusion in mmu-hash.h
> powerpc: Only use task_struct 'cpu' field on SMP
> powerpc: prep stack walkers for THREAD_INFO_IN_TASK
> powerpc: Rename THREAD_INFO to TASK_STACK
> powerpc: Prepare for moving thread_info into task_struct
> powerpc: Activate CONFIG_THREAD_INFO_IN_TASK
> powerpc: regain entire stack space
> powerpc: 'current_set' is now a table of task_struct pointers
> powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU
> powerpc/64: Remove CURRENT_THREAD_INFO
> powerpc: clean stack pointers naming
>
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/Makefile | 7 ++
> arch/powerpc/include/asm/asm-prototypes.h | 4 +-
> arch/powerpc/include/asm/book3s/64/mmu-hash.h | 2 +-
> arch/powerpc/include/asm/exception-64s.h | 4 +-
> arch/powerpc/include/asm/irq.h | 18 ++--
> arch/powerpc/include/asm/livepatch.h | 6 +-
> arch/powerpc/include/asm/processor.h | 39 +--------
> arch/powerpc/include/asm/ptrace.h | 2 +-
> arch/powerpc/include/asm/reg.h | 2 +-
> arch/powerpc/include/asm/smp.h | 17 +++-
> arch/powerpc/include/asm/task_size_user64.h | 42 +++++++++
> arch/powerpc/include/asm/thread_info.h | 19 -----
> arch/powerpc/kernel/asm-offsets.c | 10 ++-
> arch/powerpc/kernel/entry_32.S | 80 ++++++-----------
> arch/powerpc/kernel/entry_64.S | 12 +--
> arch/powerpc/kernel/epapr_hcalls.S | 5 +-
> arch/powerpc/kernel/exceptions-64e.S | 13 +--
> arch/powerpc/kernel/exceptions-64s.S | 2 +-
> arch/powerpc/kernel/head_32.S | 14 +--
> arch/powerpc/kernel/head_40x.S | 4 +-
> arch/powerpc/kernel/head_44x.S | 8 +-
> arch/powerpc/kernel/head_64.S | 1 +
> arch/powerpc/kernel/head_8xx.S | 2 +-
> arch/powerpc/kernel/head_booke.h | 12 +--
> arch/powerpc/kernel/head_fsl_booke.S | 16 ++--
> arch/powerpc/kernel/idle_6xx.S | 8 +-
> arch/powerpc/kernel/idle_book3e.S | 2 +-
> arch/powerpc/kernel/idle_e500.S | 8 +-
> arch/powerpc/kernel/idle_power4.S | 2 +-
> arch/powerpc/kernel/irq.c | 114 +++----------------------
> arch/powerpc/kernel/kgdb.c | 28 ------
> arch/powerpc/kernel/machine_kexec_64.c | 6 +-
> arch/powerpc/kernel/misc_32.S | 17 ++--
> arch/powerpc/kernel/process.c | 63 ++++++++------
> arch/powerpc/kernel/setup-common.c | 2 +-
> arch/powerpc/kernel/setup_32.c | 26 +++---
> arch/powerpc/kernel/setup_64.c | 51 +++--------
> arch/powerpc/kernel/smp.c | 16 ++--
> arch/powerpc/kernel/stacktrace.c | 29 ++++++-
> arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 6 +-
> arch/powerpc/kvm/book3s_hv_hmi.c | 1 +
> arch/powerpc/mm/hash_low_32.S | 14 ++-
> arch/powerpc/net/bpf_jit32.h | 5 +-
> arch/powerpc/sysdev/6xx-suspend.S | 5 +-
> arch/powerpc/xmon/xmon.c | 2 +-
> 46 files changed, 302 insertions(+), 445 deletions(-)
> create mode 100644 arch/powerpc/include/asm/task_size_user64.h
>
> --
> 2.13.3

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