From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Linux-mm <linux-mm@kvack.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>,
Christoph Hellwig <hch@infradead.org>,
Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
SystemTap <systemtap@sources.redhat.com>,
Jim Keniston <jkenisto@linux.vnet.ibm.com>,
Roland McGrath <roland@hack.frob.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 2.6.39-rc1-tip 4/26] 4: uprobes: Breakground page replacement.
Date: Fri, 01 Apr 2011 20:03:18 +0530 [thread overview]
Message-ID: <20110401143318.15455.64841.sendpatchset@localhost6.localdomain6> (raw)
In-Reply-To: <20110401143223.15455.19844.sendpatchset@localhost6.localdomain6>
Provides Background page replacement using replace_page() routine.
Also provides routines to read an opcode from a given virtual address
and for verifying if a instruction is a breakpoint instruction.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Jim Keniston <jkenisto@us.ibm.com>
---
arch/Kconfig | 12 ++
include/linux/uprobes.h | 81 +++++++++++++++
kernel/Makefile | 1
kernel/uprobes.c | 254 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 348 insertions(+), 0 deletions(-)
create mode 100644 include/linux/uprobes.h
create mode 100644 kernel/uprobes.c
diff --git a/arch/Kconfig b/arch/Kconfig
index f78c2be..c681f16 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -61,6 +61,18 @@ config OPTPROBES
depends on KPROBES && HAVE_OPTPROBES
depends on !PREEMPT
+config UPROBES
+ bool "User-space probes (EXPERIMENTAL)"
+ depends on ARCH_SUPPORTS_UPROBES
+ depends on MMU
+ select MM_OWNER
+ help
+ Uprobes enables kernel subsystems to establish probepoints
+ in user applications and execute handler functions when
+ the probepoints are hit.
+
+ If in doubt, say "N".
+
config HAVE_EFFICIENT_UNALIGNED_ACCESS
bool
help
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
new file mode 100644
index 0000000..ae134a5
--- /dev/null
+++ b/include/linux/uprobes.h
@@ -0,0 +1,81 @@
+#ifndef _LINUX_UPROBES_H
+#define _LINUX_UPROBES_H
+/*
+ * Userspace Probes (UProbes)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2008-2010
+ * Authors:
+ * Srikar Dronamraju
+ * Jim Keniston
+ */
+
+#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
+#include <asm/uprobes.h>
+#else
+/*
+ * ARCH_SUPPORTS_UPROBES is not defined.
+ */
+typedef u8 uprobe_opcode_t;
+#endif /* CONFIG_ARCH_SUPPORTS_UPROBES */
+
+/* Post-execution fixups. Some architectures may define others. */
+
+/* No fixup needed */
+#define UPROBES_FIX_NONE 0x0
+/* Adjust IP back to vicinity of actual insn */
+#define UPROBES_FIX_IP 0x1
+/* Adjust the return address of a call insn */
+#define UPROBES_FIX_CALL 0x2
+/* Might sleep while doing Fixup */
+#define UPROBES_FIX_SLEEPY 0x4
+
+#ifndef UPROBES_FIX_DEFAULT
+#define UPROBES_FIX_DEFAULT UPROBES_FIX_IP
+#endif
+
+/* Unexported functions & macros for use by arch-specific code */
+#define uprobe_opcode_sz (sizeof(uprobe_opcode_t))
+
+/*
+ * Most architectures can use the default versions of @read_opcode(),
+ * @set_bkpt(), @set_orig_insn(), and @is_bkpt_insn();
+ *
+ * @set_ip:
+ * Set the instruction pointer in @regs to @vaddr.
+ * @analyze_insn:
+ * Analyze @user_bkpt->insn. Return 0 if @user_bkpt->insn is an
+ * instruction you can probe, or a negative errno (typically -%EPERM)
+ * otherwise. Determine what sort of XOL-related fixups @post_xol()
+ * (and possibly @pre_xol()) will need to do for this instruction, and
+ * annotate @user_bkpt accordingly. You may modify @user_bkpt->insn
+ * (e.g., the x86_64 port does this for rip-relative instructions).
+ * @pre_xol:
+ * Called just before executing the instruction associated
+ * with @user_bkpt out of line. @user_bkpt->xol_vaddr is the address
+ * in @tsk's virtual address space where @user_bkpt->insn has been
+ * copied. @pre_xol() should at least set the instruction pointer in
+ * @regs to @user_bkpt->xol_vaddr -- which is what the default,
+ * @pre_xol(), does.
+ * @post_xol:
+ * Called after executing the instruction associated with
+ * @user_bkpt out of line. @post_xol() should perform the fixups
+ * specified in @user_bkpt->fixups, which includes ensuring that the
+ * instruction pointer in @regs points at the next instruction in
+ * the probed instruction stream. @tskinfo is as for @pre_xol().
+ * You must provide this function.
+ */
+#endif /* _LINUX_UPROBES_H */
diff --git a/kernel/Makefile b/kernel/Makefile
index 85cbfb3..7c26588 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
obj-$(CONFIG_PADATA) += padata.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+obj-$(CONFIG_UPROBES) += uprobes.o
ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/uprobes.c b/kernel/uprobes.c
new file mode 100644
index 0000000..9ef21a7
--- /dev/null
+++ b/kernel/uprobes.c
@@ -0,0 +1,254 @@
+/*
+ * Userspace Probes (UProbes)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2008-2010
+ * Authors:
+ * Srikar Dronamraju
+ * Jim Keniston
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/uprobes.h>
+#include <linux/rmap.h> /* needed for anon_vma_prepare */
+
+struct uprobe {
+ u8 insn[MAX_UINSN_BYTES];
+ u16 fixups;
+};
+
+/*
+ * NOTE:
+ * Expect the breakpoint instruction to be the smallest size instruction for
+ * the architecture. If an arch has variable length instruction and the
+ * breakpoint instruction is not of the smallest length instruction
+ * supported by that architecture then we need to modify read_opcode /
+ * write_opcode accordingly. This would never be a problem for arch's that
+ * have fixed length instructions.
+ */
+
+/*
+ * write_opcode - write the opcode at a given virtual address.
+ * @tsk: the probed task.
+ * @uprobe: the breakpointing information.
+ * @vaddr: the virtual address to store the opcode.
+ * @opcode: opcode to be written at @vaddr.
+ *
+ * Called with tsk->mm->mmap_sem held (for read and with a reference to
+ * tsk->mm.
+ *
+ * For task @tsk, write the opcode at @vaddr.
+ * Return 0 (success) or a negative errno.
+ */
+static int write_opcode(struct task_struct *tsk, struct uprobe * uprobe,
+ unsigned long vaddr, uprobe_opcode_t opcode)
+{
+ struct page *old_page, *new_page;
+ void *vaddr_old, *vaddr_new;
+ struct vm_area_struct *vma;
+ spinlock_t *ptl;
+ pte_t *orig_pte;
+ unsigned long addr;
+ int ret;
+
+ /* Read the page with vaddr into memory */
+ ret = get_user_pages(tsk, tsk->mm, vaddr, 1, 1, 1, &old_page, &vma);
+ if (ret <= 0)
+ return -EINVAL;
+ ret = -EINVAL;
+
+ /*
+ * We are interested in text pages only. Our pages of interest
+ * should be mapped for read and execute only. We desist from
+ * adding probes in write mapped pages since the breakpoints
+ * might end up in the file copy.
+ */
+ if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) !=
+ (VM_READ|VM_EXEC))
+ goto put_out;
+
+ /* Allocate a page */
+ new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, vaddr);
+ if (!new_page) {
+ ret = -ENOMEM;
+ goto put_out;
+ }
+
+ /*
+ * lock page will serialize against do_wp_page()'s
+ * PageAnon() handling
+ */
+ lock_page(old_page);
+ /* copy the page now that we've got it stable */
+ vaddr_old = kmap_atomic(old_page, KM_USER0);
+ vaddr_new = kmap_atomic(new_page, KM_USER1);
+
+ memcpy(vaddr_new, vaddr_old, PAGE_SIZE);
+ /* poke the new insn in, ASSUMES we don't cross page boundary */
+ addr = vaddr;
+ vaddr &= ~PAGE_MASK;
+ memcpy(vaddr_new + vaddr, &opcode, uprobe_opcode_sz);
+
+ kunmap_atomic(vaddr_new, KM_USER1);
+ kunmap_atomic(vaddr_old, KM_USER0);
+
+ orig_pte = page_check_address(old_page, tsk->mm, addr, &ptl, 0);
+ if (!orig_pte)
+ goto unlock_out;
+ pte_unmap_unlock(orig_pte, ptl);
+
+ lock_page(new_page);
+ ret = anon_vma_prepare(vma);
+ if (!ret)
+ ret = replace_page(vma, old_page, new_page, *orig_pte);
+
+ unlock_page(new_page);
+ if (ret != 0)
+ page_cache_release(new_page);
+unlock_out:
+ unlock_page(old_page);
+
+put_out:
+ put_page(old_page); /* we did a get_page in the beginning */
+ return ret;
+}
+
+/**
+ * read_opcode - read the opcode at a given virtual address.
+ * @tsk: the probed task.
+ * @vaddr: the virtual address to read the opcode.
+ * @opcode: location to store the read opcode.
+ *
+ * Called with tsk->mm->mmap_sem held (for read and with a reference to
+ * tsk->mm.
+ *
+ * For task @tsk, read the opcode at @vaddr and store it in @opcode.
+ * Return 0 (success) or a negative errno.
+ */
+int __weak read_opcode(struct task_struct *tsk, unsigned long vaddr,
+ uprobe_opcode_t *opcode)
+{
+ struct vm_area_struct *vma;
+ struct page *page;
+ void *vaddr_new;
+ int ret;
+
+ ret = get_user_pages(tsk, tsk->mm, vaddr, 1, 0, 0, &page, &vma);
+ if (ret <= 0)
+ return -EFAULT;
+ ret = -EFAULT;
+
+ /*
+ * We are interested in text pages only. Our pages of interest
+ * should be mapped for read and execute only. We desist from
+ * adding probes in write mapped pages since the breakpoints
+ * might end up in the file copy.
+ */
+ if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) !=
+ (VM_READ|VM_EXEC))
+ goto put_out;
+
+ lock_page(page);
+ vaddr_new = kmap_atomic(page, KM_USER0);
+ vaddr &= ~PAGE_MASK;
+ memcpy(opcode, vaddr_new + vaddr, uprobe_opcode_sz);
+ kunmap_atomic(vaddr_new, KM_USER0);
+ unlock_page(page);
+ ret = 0;
+
+put_out:
+ put_page(page); /* we did a get_page in the beginning */
+ return ret;
+}
+
+/**
+ * set_bkpt - store breakpoint at a given address.
+ * @tsk: the probed task.
+ * @uprobe: the probepoint information.
+ * @vaddr: the virtual address to insert the opcode.
+ *
+ * For task @tsk, store the breakpoint instruction at @vaddr.
+ * Return 0 (success) or a negative errno.
+ */
+int __weak set_bkpt(struct task_struct *tsk, struct uprobe *uprobe,
+ unsigned long vaddr)
+{
+ return write_opcode(tsk, uprobe, vaddr, UPROBES_BKPT_INSN);
+}
+
+/**
+ * set_orig_insn - Restore the original instruction.
+ * @tsk: the probed task.
+ * @uprobe: the probepoint information.
+ * @vaddr: the virtual address to insert the opcode.
+ * @verify: if true, verify existance of breakpoint instruction.
+ *
+ * For task @tsk, restore the original opcode (opcode) at @vaddr.
+ * Return 0 (success) or a negative errno.
+ */
+int __weak set_orig_insn(struct task_struct *tsk, struct uprobe *uprobe,
+ unsigned long vaddr, bool verify)
+{
+ if (verify) {
+ uprobe_opcode_t opcode;
+ int result = read_opcode(tsk, vaddr, &opcode);
+ if (result)
+ return result;
+ if (opcode != UPROBES_BKPT_INSN)
+ return -EINVAL;
+ }
+ return write_opcode(tsk, uprobe, vaddr,
+ *(uprobe_opcode_t *) uprobe->insn);
+}
+
+static void print_insert_fail(struct task_struct *tsk,
+ unsigned long vaddr, const char *why)
+{
+ printk(KERN_ERR "Can't place breakpoint at pid %d vaddr %#lx: %s\n",
+ tsk->pid, vaddr, why);
+}
+
+/*
+ * uprobes_resume_can_sleep - Check if fixup might result in sleep.
+ * @uprobes: the probepoint information.
+ *
+ * Returns true if fixup might result in sleep.
+ */
+static bool uprobes_resume_can_sleep(struct uprobe *uprobe)
+{
+ return uprobe->fixups & UPROBES_FIX_SLEEPY;
+}
+
+/**
+ * is_bkpt_insn - check if instruction is breakpoint instruction.
+ * @insn: instruction to be checked.
+ * Default implementation of is_bkpt_insn
+ * Returns true if @insn is a breakpoint instruction.
+ */
+bool __weak is_bkpt_insn(u8 *insn)
+{
+ uprobe_opcode_t opcode;
+
+ memcpy(&opcode, insn, UPROBES_BKPT_INSN_SIZE);
+ return (opcode == UPROBES_BKPT_INSN);
+}
next prev parent reply other threads:[~2011-04-01 14:43 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-01 14:32 [PATCH v3 2.6.39-rc1-tip 0/26] 0: Uprobes patchset with perf probe support Srikar Dronamraju
2011-04-01 14:32 ` [PATCH v3 2.6.39-rc1-tip 1/26] 1: mm: replace_page() loses static attribute Srikar Dronamraju
2011-04-01 14:32 ` [PATCH v3 2.6.39-rc1-tip 2/26] 2: mm: Move replace_page() to mm/memory.c Srikar Dronamraju
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 3/26] 3: X86 specific breakpoint definitions Srikar Dronamraju
2011-04-01 14:33 ` Srikar Dronamraju [this message]
2011-04-18 12:20 ` [PATCH v3 2.6.39-rc1-tip 4/26] 4: uprobes: Breakground page replacement Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 5/26] 5: uprobes: Adding and remove a uprobe in a rb tree Srikar Dronamraju
2011-04-18 12:20 ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 6/26] 6: Uprobes: register/unregister probes Srikar Dronamraju
2011-04-02 0:26 ` Stephen Wilson
2011-04-02 0:53 ` Srikar Dronamraju
2011-04-02 1:29 ` Stephen Wilson
2011-04-18 12:20 ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 7/26] 7: x86: analyze instruction and determine fixups Srikar Dronamraju
2011-04-19 13:29 ` Steven Rostedt
2011-04-21 17:31 ` Srikar Dronamraju
2011-04-21 17:52 ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 8/26] 8: uprobes: store/restore original instruction Srikar Dronamraju
2011-04-18 16:12 ` Peter Zijlstra
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 9/26] 9: uprobes: mmap and fork hooks Srikar Dronamraju
2011-04-18 16:21 ` Peter Zijlstra
2011-04-18 16:29 ` Peter Zijlstra
2011-04-19 6:45 ` Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 10/26] 10: x86: architecture specific task information Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 11/26] 11: uprobes: task specific information Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 12/26] 12: uprobes: slot allocation for uprobes Srikar Dronamraju
2011-04-18 16:46 ` Peter Zijlstra
2011-04-19 6:26 ` Srikar Dronamraju
2011-04-19 9:02 ` Peter Zijlstra
2011-04-19 9:11 ` Peter Zijlstra
2011-04-20 13:40 ` Eric Paris
2011-04-20 14:51 ` Frank Ch. Eigler
2011-04-20 15:16 ` Stephen Smalley
2011-04-21 14:11 ` Srikar Dronamraju
2011-04-21 14:45 ` Eric Paris
2011-04-21 16:14 ` Roland McGrath
2011-04-21 16:59 ` Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 13/26] 13: uprobes: get the breakpoint address Srikar Dronamraju
2011-04-18 16:47 ` Peter Zijlstra
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 14/26] 14: x86: x86 specific probe handling Srikar Dronamraju
2011-04-18 16:55 ` Peter Zijlstra
2011-04-19 5:43 ` Srikar Dronamraju
2011-04-18 16:57 ` Peter Zijlstra
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 15/26] 15: uprobes: Handing int3 and singlestep exception Srikar Dronamraju
2011-04-19 13:03 ` Peter Zijlstra
2011-04-19 13:12 ` Steven Rostedt
2011-04-21 17:10 ` Srikar Dronamraju
2011-04-21 17:41 ` Peter Zijlstra
2011-04-19 13:39 ` Peter Zijlstra
2011-04-21 17:03 ` Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 16/26] 16: x86: uprobes exception notifier for x86 Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 17/26] 17: uprobes: register a notifier for uprobes Srikar Dronamraju
2011-04-19 13:54 ` Peter Zijlstra
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 18/26] 18: uprobes: commonly used filters Srikar Dronamraju
2011-04-05 1:26 ` Masami Hiramatsu
2011-04-19 13:57 ` Peter Zijlstra
2011-04-21 11:09 ` Srikar Dronamraju
2011-04-21 11:37 ` Peter Zijlstra
2011-04-21 11:49 ` Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 19/26] 19: tracing: Extract out common code for kprobes/uprobes traceevents Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 20/26] 20: tracing: uprobes trace_event interface Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 21/26] 21: Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Srikar Dronamraju
2011-04-01 14:47 ` [RESEND] [PATCH v3 2.6.39-rc1-tip 21/26] 21: Uprobe tracer documentation " Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 22/26] 22: perf: rename target_module to target Srikar Dronamraju
2011-04-04 10:06 ` Masami Hiramatsu
2011-04-06 23:46 ` Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 23/26] 23: perf: show possible probes in a given executable file or library Srikar Dronamraju
2011-04-04 10:15 ` Masami Hiramatsu
2011-04-06 22:50 ` Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 24/26] 24: perf: perf interface for uprobes Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 25/26] 25: perf: Documentation for perf uprobes Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 26/26] 26: uprobes: filter chain Srikar Dronamraju
2011-04-05 1:27 ` Masami Hiramatsu
2011-04-06 22:41 ` Srikar Dronamraju
2011-04-07 3:19 ` Masami Hiramatsu
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for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).