Linux 2.6.34.5

Linux 2.6.34.5

[Greg KH]

I'm announcing the release of the 2.6.34.5 kernel.

All users of the 2.6.34 kernel series must upgrade.  Actually, you
should switch to the .35 kernel releases, as there is only going to be
one more .34-stable kernel release after this one.  Really, I mean it
this time :)

The updated 2.6.34.y git tree can be found at:
        git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.34.y.git
and can be browsed at the normal kernel.org git web browser:
        http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.34.y.git;a=summary

thanks,

greg k-h

------------

 Makefile                     |    2 +-
 arch/x86/kernel/cpu/vmware.c |    1 +
 fs/proc/task_mmu.c           |    8 +++++++-
 mm/memory.c                  |   13 ++++++-------
 mm/mlock.c                   |    8 ++++++++
 5 files changed, 23 insertions(+), 9 deletions(-)

Greg Kroah-Hartman (2):
      vmware: fix build error in vmware.c
      Linux 2.6.34.5

Linus Torvalds (2):
      mm: fix page table unmap for stack guard page properly
      mm: fix up some user-visible effects of the stack guard page

Re: Linux 2.6.34.5

[Greg KH]

diff --git a/Makefile b/Makefile
index 335df5f..10c5a85 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 34
-EXTRAVERSION = .4
+EXTRAVERSION = .5
 NAME = Sheep on Meth
 
 # *DOCUMENTATION*
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 562d5f0..e44e02d 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -23,6 +23,7 @@
 
 #include <linux/dmi.h>
 #include <linux/module.h>
+#include <linux/jiffies.h>
 #include <asm/div64.h>
 #include <asm/vmware.h>
 #include <asm/x86_init.h>
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 47f5b14..3544f60 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,
 			vma->vm_end,
 			flags & VM_READ ? 'r' : '-',
 			flags & VM_WRITE ? 'w' : '-',
diff --git a/mm/memory.c b/mm/memory.c
index daa100f..e48eb86 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2783,24 +2783,23 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
 	spinlock_t *ptl;
 	pte_t entry;
 
-	if (check_stack_guard_page(vma, address) < 0) {
-		pte_unmap(page_table);
+	pte_unmap(page_table);
+
+	/* Check if we need to add a guard page to the stack */
+	if (check_stack_guard_page(vma, address) < 0)
 		return VM_FAULT_SIGBUS;
-	}
 
+	/* Use the zero-page for reads */
 	if (!(flags & FAULT_FLAG_WRITE)) {
 		entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
 						vma->vm_page_prot));
-		ptl = pte_lockptr(mm, pmd);
-		spin_lock(ptl);
+		page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
 		if (!pte_none(*page_table))
 			goto unlock;
 		goto setpte;
 	}
 
 	/* Allocate our own private page. */
-	pte_unmap(page_table);
-
 	if (unlikely(anon_vma_prepare(vma)))
 		goto oom;
 	page = alloc_zeroed_user_highpage_movable(vma, address);
diff --git a/mm/mlock.c b/mm/mlock.c
index 8f4e2df..8268859 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;