mm: fix up some user-visible effects of the stack guard page

commit d7824370e26325c881b665350ce64fb0a4fde24a upstream.

This commit makes the stack guard page somewhat less visible to user
space. It does this by:

 - not showing the guard page in /proc/<pid>/maps

   It looks like lvm-tools will actually read /proc/self/maps to figure
   out where all its mappings are, and effectively do a specialized
   "mlockall()" in user space.  By not showing the guard page as part of
   the mapping (by just adding PAGE_SIZE to the start for grows-up
   pages), lvm-tools ends up not being aware of it.

 - by also teaching the _real_ mlock() functionality not to try to lock
   the guard page.

   That would just expand the mapping down to create a new guard page,
   so there really is no point in trying to lock it in place.

It would perhaps be nice to show the guard page specially in
/proc/<pid>/maps (or at least mark grow-down segments some way), but
let's not open ourselves up to more breakage by user space from programs
that depends on the exact deails of the 'maps' file.

Special thanks to Henrique de Moraes Holschuh for diving into lvm-tools
source code to see what was going on with the whole new warning.

[Note, for .27, only the /proc change is done, mlock is not modified
here. - gregkh]

Reported-and-tested-by: François Valenduc <francois.valenduc@tvcablenet.be
Reported-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index d8be92a171f3285e08b3eb8f6b441de260d2d9a5..0325100c3319ea4311e46de1bc37fcabe9caf0fa 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -205,6 +205,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
        struct file *file = vma->vm_file;
        int flags = vma->vm_flags;
        unsigned long ino = 0;
+       unsigned long start;
        dev_t dev = 0;
        int len;
 
@@ -214,8 +215,13 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                ino = inode->i_ino;
        }
 
+       /* We don't show the stack guard page in /proc/maps */
+       start = vma->vm_start;
+       if (vma->vm_flags & VM_GROWSDOWN)
+               start += PAGE_SIZE;
+
        seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
-                       vma->vm_start,
+                       start,
                        vma->vm_end,
                        flags & VM_READ ? 'r' : '-',
                        flags & VM_WRITE ? 'w' : '-',