diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-05-20 02:58:32 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-05-20 22:36:31 +0400 |
| commit | 78d683e838a60ec4ba4591cca4364cba84a9e626 (patch) | |
| tree | 8b6760577295bf709d8567262b43eee5e8a86de2 /fs | |
| parent | 1e844fb43c96dcdba3b578918f5c485d88750891 (diff) | |
| download | linux-78d683e838a60ec4ba4591cca4364cba84a9e626.tar.xz | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/binfmt_elf.c | 8 | ||||
| -rw-r--r-- | fs/proc/task_mmu.c | 6 |
2 files changed, 14 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; |