diff options
authorLinus Torvalds <>2010-08-15 11:35:52 -0700
committerLinus Torvalds <>2010-08-15 11:35:52 -0700
commitd7824370e26325c881b665350ce64fb0a4fde24a (patch)
parent1b68c9596ce17a1e06918ed65fc3d19b92b04aab (diff)
mm: fix up some user-visible effects of the stack guard page
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. Reported-and-tested-by: Fran├žois Valenduc < Reported-by: Henrique de Moraes Holschuh <> Cc: Signed-off-by: Linus Torvalds <>
2 files changed, 15 insertions, 1 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index aea1d3f1ffb..439fc1f1c1c 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -210,6 +210,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
int flags = vma->vm_flags;
unsigned long ino = 0;
unsigned long long pgoff = 0;
+ unsigned long start;
dev_t dev = 0;
int len;
@@ -220,8 +221,13 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
+ /* 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,
flags & VM_READ ? 'r' : '-',
flags & VM_WRITE ? 'w' : '-',
diff --git a/mm/mlock.c b/mm/mlock.c
index 3f82720e051..49e5e4cb823 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -167,6 +167,14 @@ static long __mlock_vma_pages_range(struct vm_area_struct *vma,
if (vma->vm_flags & VM_WRITE)
gup_flags |= FOLL_WRITE;
+ /* We don't try to access the guard page of a stack vma */
+ if (vma->vm_flags & VM_GROWSDOWN) {
+ if (start == vma->vm_start) {
+ start += PAGE_SIZE;
+ nr_pages--;
+ }
+ }
while (nr_pages > 0) {
int i;