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authorAndy Lutomirski <luto@amacapital.net>2014-05-19 15:58:32 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2014-05-20 11:36:31 -0700
commit78d683e838a60ec4ba4591cca4364cba84a9e626 (patch)
tree8b6760577295bf709d8567262b43eee5e8a86de2
parent1e844fb43c96dcdba3b578918f5c485d88750891 (diff)
mm, fs: Add vm_ops->name as an alternative to arch_vma_name
arch_vma_name sucks. It's a silly hack, and it's annoying to implement correctly. In fact, AFAICS, even the straightforward x86 implementation is incorrect (I suspect that it breaks if the vdso mapping is split or gets remapped). This adds a new vm_ops->name operation that can replace it. The followup patches will remove all uses of arch_vma_name on x86, fixing a couple of annoyances in the process. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/2eee21791bb36a0a408c5c2bdb382a9e6a41ca4a.1400538962.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
-rw-r--r--fs/binfmt_elf.c8
-rw-r--r--fs/proc/task_mmu.c6
-rw-r--r--include/linux/mm.h6
3 files changed, 20 insertions, 0 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index aa3cb626671e..df9ea4186d75 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1108,6 +1108,14 @@ static bool always_dump_vma(struct vm_area_struct *vma)
/* Any vsyscall mappings? */
if (vma == get_gate_vma(vma->vm_mm))
return true;
+
+ /*
+ * Assume that all vmas with a .name op should always be dumped.
+ * If this changes, a new vm_ops field can easily be added.
+ */
+ if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
+ return true;
+
/*
* arch_vma_name() returns non-NULL for special architecture mappings,
* such as vDSO sections.
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 442177b1119a..9b2f5d62ce63 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -300,6 +300,12 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
goto done;
}
+ if (vma->vm_ops && vma->vm_ops->name) {
+ name = vma->vm_ops->name(vma);
+ if (name)
+ goto done;
+ }
+
name = arch_vma_name(vma);
if (!name) {
pid_t tid;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf9811e1321a..63f8d4efe303 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -239,6 +239,12 @@ struct vm_operations_struct {
*/
int (*access)(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
+
+ /* Called by the /proc/PID/maps code to ask the vma whether it
+ * has a special name. Returning non-NULL will also cause this
+ * vma to be dumped unconditionally. */
+ const char *(*name)(struct vm_area_struct *vma);
+
#ifdef CONFIG_NUMA
/*
* set_policy() op must add a reference to any non-NULL @new mempolicy