From: Greg Kroah-Hartman Date: Sat, 14 Aug 2010 18:44:42 +0000 (-0700) Subject: a .27 patch X-Git-Tag: v2.6.27.52~10 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b4ce129e6ab7335382f0205d2c705b3c4468ae3a;p=thirdparty%2Fkernel%2Fstable-queue.git a .27 patch --- diff --git a/review-2.6.27/mm-pass-correct-mm-when-growing-stack.patch b/review-2.6.27/mm-pass-correct-mm-when-growing-stack.patch new file mode 100644 index 00000000000..3697ca3c627 --- /dev/null +++ b/review-2.6.27/mm-pass-correct-mm-when-growing-stack.patch @@ -0,0 +1,39 @@ +From 05fa199d45c54a9bda7aa3ae6537253d6f097aa9 Mon Sep 17 00:00:00 2001 +From: Hugh Dickins +Date: Thu, 16 Apr 2009 21:58:12 +0100 +Subject: mm: pass correct mm when growing stack + +From: Hugh Dickins + +commit 05fa199d45c54a9bda7aa3ae6537253d6f097aa9 upstream. + +Tetsuo Handa reports seeing the WARN_ON(current->mm == NULL) in +security_vm_enough_memory(), when do_execve() is touching the +target mm's stack, to set up its args and environment. + +Yes, a UMH_NO_WAIT or UMH_WAIT_PROC call_usermodehelper() spawns +an mm-less kernel thread to do the exec. And in any case, that +vm_enough_memory check when growing stack ought to be done on the +target mm, not on the execer's mm (though apart from the warning, +it only makes a slight tweak to OVERCOMMIT_NEVER behaviour). + +Reported-by: Tetsuo Handa +Signed-off-by: Hugh Dickins +Signed-off-by: Linus Torvalds +Signed-off-by: Greg Kroah-Hartman + +--- + mm/mmap.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/mm/mmap.c ++++ b/mm/mmap.c +@@ -1573,7 +1573,7 @@ static int acct_stack_growth(struct vm_a + * Overcommit.. This must be the final test, as it will + * update security statistics. + */ +- if (security_vm_enough_memory(grow)) ++ if (security_vm_enough_memory_mm(mm, grow)) + return -ENOMEM; + + /* Ok, everything looks good - let it rip */ diff --git a/review-2.6.27/series b/review-2.6.27/series index 17f31002693..7c26ef1fcb3 100644 --- a/review-2.6.27/series +++ b/review-2.6.27/series @@ -1,3 +1,4 @@ mm-keep-a-guard-page-below-a-grow-down-stack-segment.patch mm-fix-missing-page-table-unmap-for-stack-guard-page-failure-case.patch x86-don-t-send-sigbus-for-kernel-page-faults.patch +mm-pass-correct-mm-when-growing-stack.patch