3.19.8-ckt12 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Dave Hansen <dave.han...@linux.intel.com> commit b0e9b09b3bd64e67bba862e238d3757b2482b6de upstream. The uprobes code has a nice helper, is_64bit_mm(), that consults both the runtime and compile-time flags for 32-bit support. Instead of reinventing the wheel, pull it in to an x86 header so we can use it for MPX. I prefer passing the 'mm' around to test_thread_flag(TIF_IA32) because it makes it explicit where the context is coming from. Signed-off-by: Dave Hansen <dave.han...@linux.intel.com> Reviewed-by: Thomas Gleixner <t...@linutronix.de> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Dave Hansen <d...@sr71.net> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Oleg Nesterov <o...@redhat.com> Cc: Peter Zijlstra <pet...@infradead.org> Link: http://lkml.kernel.org/r/20150607183704.f0209...@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mi...@kernel.org> [ kamal: 3.19-stable prereq for "46561c3 x86/mpx: Do proper get_user() when running 32-bit binaries on 64-bit kernels" ] Signed-off-by: Kamal Mostafa <ka...@canonical.com> --- arch/x86/include/asm/mmu_context.h | 13 +++++++++++++ arch/x86/kernel/uprobes.c | 10 +--------- 2 files changed, 14 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 1ab38a4..acdeb2be 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -165,6 +165,19 @@ static inline void arch_exit_mmap(struct mm_struct *mm) paravirt_arch_exit_mmap(mm); } +#ifdef CONFIG_X86_64 +static inline bool is_64bit_mm(struct mm_struct *mm) +{ + return !config_enabled(CONFIG_IA32_EMULATION) || + !(mm->context.ia32_compat == TIF_IA32); +} +#else +static inline bool is_64bit_mm(struct mm_struct *mm) +{ + return false; +} +#endif + static inline void arch_bprm_mm_init(struct mm_struct *mm, struct vm_area_struct *vma) { diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index 8b96a94..6b1ca70 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -29,6 +29,7 @@ #include <linux/kdebug.h> #include <asm/processor.h> #include <asm/insn.h> +#include <asm/mmu_context.h> /* Post-execution fixups. */ @@ -245,11 +246,6 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool } #ifdef CONFIG_X86_64 -static inline bool is_64bit_mm(struct mm_struct *mm) -{ - return !config_enabled(CONFIG_IA32_EMULATION) || - !(mm->context.ia32_compat == TIF_IA32); -} /* * If arch_uprobe->insn doesn't use rip-relative addressing, return * immediately. Otherwise, rewrite the instruction so that it accesses @@ -430,10 +426,6 @@ static void riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) } } #else /* 32-bit: */ -static inline bool is_64bit_mm(struct mm_struct *mm) -{ - return false; -} /* * No RIP-relative addressing on 32-bit */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
