Merge branch 'uprobes/core' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc into perf/core
Pull uprobes cleanups from Oleg Nesterov. Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
commit
09897d78db
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@ -36,9 +36,8 @@ typedef ppc_opcode_t uprobe_opcode_t;
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struct arch_uprobe {
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union {
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u8 insn[MAX_UINSN_BYTES];
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u8 ixol[MAX_UINSN_BYTES];
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u32 ainsn;
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u32 insn;
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u32 ixol;
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};
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};
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@ -186,7 +186,7 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
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* emulate_step() returns 1 if the insn was successfully emulated.
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* For all other cases, we need to single-step in hardware.
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*/
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ret = emulate_step(regs, auprobe->ainsn);
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ret = emulate_step(regs, auprobe->insn);
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if (ret > 0)
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return true;
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@ -26,16 +26,13 @@
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#include <linux/errno.h>
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#include <linux/rbtree.h>
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#include <linux/types.h>
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struct vm_area_struct;
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struct mm_struct;
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struct inode;
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struct notifier_block;
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#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
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# include <asm/uprobes.h>
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#endif
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#define UPROBE_HANDLER_REMOVE 1
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#define UPROBE_HANDLER_MASK 1
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@ -60,6 +57,8 @@ struct uprobe_consumer {
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};
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#ifdef CONFIG_UPROBES
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#include <asm/uprobes.h>
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enum uprobe_task_state {
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UTASK_RUNNING,
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UTASK_SSTEP,
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@ -72,34 +71,27 @@ enum uprobe_task_state {
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*/
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struct uprobe_task {
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enum uprobe_task_state state;
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struct arch_uprobe_task autask;
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union {
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struct {
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struct arch_uprobe_task autask;
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unsigned long vaddr;
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};
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struct {
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struct callback_head dup_xol_work;
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unsigned long dup_xol_addr;
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};
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};
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struct uprobe *active_uprobe;
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unsigned long xol_vaddr;
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struct return_instance *return_instances;
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unsigned int depth;
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struct uprobe *active_uprobe;
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unsigned long xol_vaddr;
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unsigned long vaddr;
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};
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/*
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* On a breakpoint hit, thread contests for a slot. It frees the
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* slot after singlestep. Currently a fixed number of slots are
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* allocated.
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*/
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struct xol_area {
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wait_queue_head_t wq; /* if all slots are busy */
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atomic_t slot_count; /* number of in-use slots */
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unsigned long *bitmap; /* 0 = free slot */
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struct page *page;
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/*
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* We keep the vma's vm_start rather than a pointer to the vma
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* itself. The probed process or a naughty kernel module could make
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* the vma go away, and we must handle that reasonably gracefully.
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*/
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unsigned long vaddr; /* Page(s) of instruction slots */
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};
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struct xol_area;
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struct uprobes_state {
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struct xol_area *xol_area;
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@ -109,6 +101,7 @@ extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsign
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extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
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extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
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extern bool __weak is_trap_insn(uprobe_opcode_t *insn);
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extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
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extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
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extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
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extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
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@ -120,7 +113,6 @@ extern void uprobe_end_dup_mmap(void);
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extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
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extern void uprobe_free_utask(struct task_struct *t);
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extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
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extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
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extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
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extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
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extern void uprobe_notify_resume(struct pt_regs *regs);
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@ -176,10 +168,6 @@ static inline bool uprobe_deny_signal(void)
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{
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return false;
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}
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static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
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{
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return 0;
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}
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static inline void uprobe_free_utask(struct task_struct *t)
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{
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}
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@ -73,6 +73,17 @@ struct uprobe {
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struct inode *inode; /* Also hold a ref to inode */
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loff_t offset;
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unsigned long flags;
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/*
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* The generic code assumes that it has two members of unknown type
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* owned by the arch-specific code:
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*
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* insn - copy_insn() saves the original instruction here for
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* arch_uprobe_analyze_insn().
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*
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* ixol - potentially modified instruction to execute out of
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* line, copied to xol_area by xol_get_insn_slot().
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*/
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struct arch_uprobe arch;
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};
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@ -85,6 +96,29 @@ struct return_instance {
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struct return_instance *next; /* keep as stack */
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};
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/*
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* Execute out of line area: anonymous executable mapping installed
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* by the probed task to execute the copy of the original instruction
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* mangled by set_swbp().
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*
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* On a breakpoint hit, thread contests for a slot. It frees the
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* slot after singlestep. Currently a fixed number of slots are
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* allocated.
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*/
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struct xol_area {
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wait_queue_head_t wq; /* if all slots are busy */
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atomic_t slot_count; /* number of in-use slots */
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unsigned long *bitmap; /* 0 = free slot */
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struct page *page;
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/*
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* We keep the vma's vm_start rather than a pointer to the vma
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* itself. The probed process or a naughty kernel module could make
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* the vma go away, and we must handle that reasonably gracefully.
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*/
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unsigned long vaddr; /* Page(s) of instruction slots */
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};
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/*
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* valid_vma: Verify if the specified vma is an executable vma
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* Relax restrictions while unregistering: vm_flags might have
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@ -330,7 +364,7 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned
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int __weak
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set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
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{
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return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)auprobe->insn);
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return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)&auprobe->insn);
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}
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static int match_uprobe(struct uprobe *l, struct uprobe *r)
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@ -529,8 +563,8 @@ static int copy_insn(struct uprobe *uprobe, struct file *filp)
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{
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struct address_space *mapping = uprobe->inode->i_mapping;
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loff_t offs = uprobe->offset;
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void *insn = uprobe->arch.insn;
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int size = MAX_UINSN_BYTES;
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void *insn = &uprobe->arch.insn;
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int size = sizeof(uprobe->arch.insn);
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int len, err = -EIO;
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/* Copy only available bytes, -EIO if nothing was read */
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@ -569,7 +603,7 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
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goto out;
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ret = -ENOTSUPP;
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if (is_trap_insn((uprobe_opcode_t *)uprobe->arch.insn))
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if (is_trap_insn((uprobe_opcode_t *)&uprobe->arch.insn))
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goto out;
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ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
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@ -1264,7 +1298,7 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe)
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/* Initialize the slot */
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copy_to_page(area->page, xol_vaddr,
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uprobe->arch.ixol, sizeof(uprobe->arch.ixol));
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&uprobe->arch.ixol, sizeof(uprobe->arch.ixol));
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/*
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* We probably need flush_icache_user_range() but it needs vma.
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* This should work on supported architectures too.
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@ -1403,12 +1437,10 @@ static void uprobe_warn(struct task_struct *t, const char *msg)
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static void dup_xol_work(struct callback_head *work)
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{
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kfree(work);
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if (current->flags & PF_EXITING)
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return;
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if (!__create_xol_area(current->utask->vaddr))
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if (!__create_xol_area(current->utask->dup_xol_addr))
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uprobe_warn(current, "dup xol area");
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}
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@ -1419,7 +1451,6 @@ void uprobe_copy_process(struct task_struct *t, unsigned long flags)
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{
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struct uprobe_task *utask = current->utask;
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struct mm_struct *mm = current->mm;
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struct callback_head *work;
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struct xol_area *area;
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t->utask = NULL;
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if (mm == t->mm)
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return;
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/* TODO: move it into the union in uprobe_task */
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work = kmalloc(sizeof(*work), GFP_KERNEL);
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if (!work)
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return uprobe_warn(t, "dup xol area");
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t->utask->vaddr = area->vaddr;
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init_task_work(work, dup_xol_work);
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task_work_add(t, work, true);
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t->utask->dup_xol_addr = area->vaddr;
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init_task_work(&t->utask->dup_xol_work, dup_xol_work);
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task_work_add(t, &t->utask->dup_xol_work, true);
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}
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/*
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