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arm64 fixes for -rc5

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- Disable in-kernel BTI when compiling with GCC, as it makes invalid
   assumptions about the distance between functions which has led to
   crashes when calling modules on a CPU with BTI support.
 
 - Remove bogus TIF_SME flag management if memory allocation fails in the
   ptrace code.
 
 - Fix the resume path when configured for 52-bit virtual addressing.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "Three small arm64 fixes, all related to optional architecture
  extensions: BTI, SME and 52-bit virtual addressing:

   - Disable in-kernel BTI when compiling with GCC, as it makes invalid
     assumptions about the distance between functions which has led to
     crashes when calling modules on a CPU with BTI support

   - Remove bogus TIF_SME flag management if memory allocation fails in
     the ptrace code

   - Fix the resume path when configured for 52-bit virtual addressing"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: fix resume for 52-bit enabled builds
  arm64/ptrace: Don't clear calling process' TIF_SME on OOM
  arm64/bti: Disable in kernel BTI when cross section thunks are broken
This commit is contained in:
Linus Torvalds 2022-09-11 07:48:21 -04:00
commit 087aa69a9f
3 changed files with 5 additions and 2 deletions
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2
arch/arm64/Kconfig
View file

@ -1887,6 +1887,8 @@ config ARM64_BTI_KERNEL
depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
depends on !CC_IS_GCC || GCC_VERSION >= 100100
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106671
depends on !CC_IS_GCC
# https://github.com/llvm/llvm-project/commit/a88c722e687e6780dcd6a58718350dc76fcc4cc9
depends on !CC_IS_CLANG || CLANG_VERSION >= 120000
depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)

2
arch/arm64/kernel/ptrace.c
View file

@ -1084,7 +1084,6 @@ static int za_set(struct task_struct *target,
if (!target->thread.sve_state) {
sve_alloc(target, false);
if (!target->thread.sve_state) {
clear_thread_flag(TIF_SME);
ret = -ENOMEM;
goto out;
}
@ -1094,7 +1093,6 @@ static int za_set(struct task_struct *target,
sme_alloc(target);
if (!target->thread.za_state) {
ret = -ENOMEM;
clear_tsk_thread_flag(target, TIF_SME);
goto out;
}

3
arch/arm64/kernel/sleep.S
View file

@ -101,6 +101,9 @@ SYM_FUNC_END(__cpu_suspend_enter)
SYM_CODE_START(cpu_resume)
bl init_kernel_el
bl finalise_el2
#if VA_BITS > 48
ldr_l x0, vabits_actual
#endif
bl __cpu_setup
/* enable the MMU early - so we can access sleep_save_stash by va */
adrp x1, swapper_pg_dir