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    Subject[PATCH 1/2] uprobes: Pass probed vaddr to arch_uprobe_analyze_insn()
    From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>

    On RISC architectures like powerpc, instructions are fixed size.
    Instruction analysis on such platforms is just a matter of (insn % 4).
    Pass the vaddr at which the uprobe is to be inserted so that
    arch_uprobe_analyze_insn() can flag misaligned registration requests.

    Signed-off-by: Ananth N Mavinakaynahalli <ananth@in.ibm.com>
    ---
    arch/x86/include/asm/uprobes.h | 2 +-
    arch/x86/kernel/uprobes.c | 3 ++-
    kernel/events/uprobes.c | 2 +-
    3 files changed, 4 insertions(+), 3 deletions(-)

    Index: uprobes-24may/arch/x86/include/asm/uprobes.h
    ===================================================================
    --- uprobes-24may.orig/arch/x86/include/asm/uprobes.h
    +++ uprobes-24may/arch/x86/include/asm/uprobes.h
    @@ -48,7 +48,7 @@ struct arch_uprobe_task {
    #endif
    };

    -extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm);
    +extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, loff_t vaddr);
    extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
    extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
    extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
    Index: uprobes-24may/arch/x86/kernel/uprobes.c
    ===================================================================
    --- uprobes-24may.orig/arch/x86/kernel/uprobes.c
    +++ uprobes-24may/arch/x86/kernel/uprobes.c
    @@ -409,9 +409,10 @@ static int validate_insn_bits(struct arc
    * arch_uprobe_analyze_insn - instruction analysis including validity and fixups.
    * @mm: the probed address space.
    * @arch_uprobe: the probepoint information.
    + * @vaddr: virtual address at which to install the probepoint
    * Return 0 on success or a -ve number on error.
    */
    -int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm)
    +int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, loff_t vaddr)
    {
    int ret;
    struct insn insn;
    Index: uprobes-24may/kernel/events/uprobes.c
    ===================================================================
    --- uprobes-24may.orig/kernel/events/uprobes.c
    +++ uprobes-24may/kernel/events/uprobes.c
    @@ -697,7 +697,7 @@ install_breakpoint(struct uprobe *uprobe
    if (is_swbp_insn((uprobe_opcode_t *)uprobe->arch.insn))
    return -EEXIST;

    - ret = arch_uprobe_analyze_insn(&uprobe->arch, mm);
    + ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
    if (ret)
    return ret;



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