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Message-ID: <20120614110550.GA2738@bandura.brq.redhat.com>
Date: Thu, 14 Jun 2012 13:05:50 +0200
From: Anton Arapov <anton@...hat.com>
To: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Ingo Molnar <mingo@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/6] uprobes: don't use loff_t for the valid virtual
address
From: Oleg Nesterov <oleg@...hat.com>
loff_t looks confusing when it is used for the virtual address.
Change map_info and install_breakpoint/remove_breakpoint paths
to use "unsigned long".
The patch doesn't change vma_address(), it can't return "long"
because it is used to verify the mapping. But probably this
needs some cleanups too.
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Anton Arapov <anton@...hat.com>
---
arch/x86/include/asm/uprobes.h | 2 +-
arch/x86/kernel/uprobes.c | 4 ++--
kernel/events/uprobes.c | 26 +++++++++-----------------
3 files changed, 12 insertions(+), 20 deletions(-)
diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
index f3971bb..14f0d44 100644
--- a/arch/x86/include/asm/uprobes.h
+++ b/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, unsigned long addr);
+extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long 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);
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 36fd420..e17b749 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -409,10 +409,10 @@ static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm,
* arch_uprobe_analyze_insn - instruction analysis including validity and fixups.
* @mm: the probed address space.
* @arch_uprobe: the probepoint information.
- * @addr: virtual address at which to install the probepoint
+ * @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, unsigned long addr)
+int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
{
int ret;
struct insn insn;
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 0e8d28e..a57bb1b 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -677,9 +677,8 @@ static int copy_insn(struct uprobe *uprobe, struct file *filp)
*/
static int
install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
- struct vm_area_struct *vma, loff_t vaddr)
+ struct vm_area_struct *vma, unsigned long vaddr)
{
- unsigned long addr;
int ret;
/*
@@ -692,8 +691,6 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
if (!uprobe->consumers)
return -EEXIST;
- addr = (unsigned long)vaddr;
-
if (!(uprobe->flags & UPROBE_COPY_INSN)) {
ret = copy_insn(uprobe, vma->vm_file);
if (ret)
@@ -702,7 +699,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
if (is_swbp_insn((uprobe_opcode_t *)uprobe->arch.insn))
return -ENOTSUPP;
- ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, addr);
+ ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
if (ret)
return ret;
@@ -722,7 +719,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
* Hence increment before and decrement on failure.
*/
atomic_inc(&mm->uprobes_state.count);
- ret = set_swbp(&uprobe->arch, mm, addr);
+ ret = set_swbp(&uprobe->arch, mm, vaddr);
if (ret)
atomic_dec(&mm->uprobes_state.count);
@@ -730,9 +727,9 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
}
static void
-remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, loff_t vaddr)
+remove_breakpoint(struct uprobe *uprobe, struct mm_struct *mm, unsigned long vaddr)
{
- if (!set_orig_insn(&uprobe->arch, mm, (unsigned long)vaddr, true))
+ if (!set_orig_insn(&uprobe->arch, mm, vaddr, true))
atomic_dec(&mm->uprobes_state.count);
}
@@ -756,7 +753,7 @@ static void delete_uprobe(struct uprobe *uprobe)
struct map_info {
struct map_info *next;
struct mm_struct *mm;
- loff_t vaddr;
+ unsigned long vaddr;
};
static inline struct map_info *free_map_info(struct map_info *info)
@@ -850,7 +847,6 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
while (info) {
struct mm_struct *mm = info->mm;
struct vm_area_struct *vma;
- loff_t vaddr;
if (err)
goto free;
@@ -860,9 +856,8 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
if (!vma || !valid_vma(vma, is_register))
goto unlock;
- vaddr = vma_address(vma, uprobe->offset);
if (vma->vm_file->f_mapping->host != uprobe->inode ||
- vaddr != info->vaddr)
+ vma_address(vma, uprobe->offset) != info->vaddr)
goto unlock;
if (is_register) {
@@ -1068,10 +1063,8 @@ int uprobe_mmap(struct vm_area_struct *vma)
count = 0;
list_for_each_entry(uprobe, &tmp_list, pending_list) {
- loff_t vaddr;
-
if (!ret) {
- vaddr = vma_address(vma, uprobe->offset);
+ loff_t vaddr = vma_address(vma, uprobe->offset);
if (vaddr < vma->vm_start || vaddr >= vma->vm_end) {
put_uprobe(uprobe);
@@ -1135,9 +1128,8 @@ void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned lon
build_probe_list(inode, &tmp_list);
list_for_each_entry(uprobe, &tmp_list, pending_list) {
- loff_t vaddr;
+ loff_t vaddr = vma_address(vma, uprobe->offset);
- vaddr = vma_address(vma, uprobe->offset);
if (vaddr >= start && vaddr < end) {
/*
* An unregister could have removed the probe before
--
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