diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-09-21 17:02:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:34 -0700 |
| commit | 73d7c33e81aed92ac185950a20407c1a2ea65a83 (patch) | |
| tree | e178b87c69034a6487db9bdfbf7ffc932056002f | |
| parent | d0107eb07320b5d37c0f8a9f015534caebb28a48 (diff) | |
kcore: /proc/kcore should use vread
/proc/kcore has its own routine to access vmallc area. It can be replaced
with vread(). And by this, /proc/kcore can do safe access to vmalloc
area.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Mike Smith <scgtrp@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/kcore.c | 35 |
1 files changed, 2 insertions, 33 deletions
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 59b43a06887..f06f45b4218 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -328,43 +328,12 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) return -EFAULT; } else if (is_vmalloc_addr((void *)start)) { char * elf_buf; - struct vm_struct *m; - unsigned long curstart = start; - unsigned long cursize = tsz; elf_buf = kzalloc(tsz, GFP_KERNEL); if (!elf_buf) return -ENOMEM; - - read_lock(&vmlist_lock); - for (m=vmlist; m && cursize; m=m->next) { - unsigned long vmstart; - unsigned long vmsize; - unsigned long msize = m->size - PAGE_SIZE; - - if (((unsigned long)m->addr + msize) < - curstart) - continue; - if ((unsigned long)m->addr > (curstart + - cursize)) - break; - vmstart = (curstart < (unsigned long)m->addr ? - (unsigned long)m->addr : curstart); - if (((unsigned long)m->addr + msize) > - (curstart + cursize)) - vmsize = curstart + cursize - vmstart; - else - vmsize = (unsigned long)m->addr + - msize - vmstart; - curstart = vmstart + vmsize; - cursize -= vmsize; - /* don't dump ioremap'd stuff! (TA) */ - if (m->flags & VM_IOREMAP) - continue; - memcpy(elf_buf + (vmstart - start), - (char *)vmstart, vmsize); - } - read_unlock(&vmlist_lock); + vread(elf_buf, (char *)start, tsz); + /* we have to zero-fill user buffer even if no read */ if (copy_to_user(buffer, elf_buf, tsz)) { kfree(elf_buf); return -EFAULT; |