diff options
Diffstat (limited to 'meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch')
| -rw-r--r-- | meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch new file mode 100644 index 0000000..588cd8c --- /dev/null +++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch @@ -0,0 +1,56 @@ +From 68785afca6b04411df86323dca372f136e225639 Mon Sep 17 00:00:00 2001 +From: Helge Deller <deller@gmx.de> +Date: Mon, 19 Jun 2017 17:34:05 +0200 +Subject: [PATCH 3/3] [SEC][Backport] Allow stack to grow up to address space + limit +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +commit bd726c90b6b8ce87602208701b208a208e6d5600 upstream. + +Fix expand_upwards() on architectures with an upward-growing stack (parisc, +metag and partly IA-64) to allow the stack to reliably grow exactly up to +the address space limit given by TASK_SIZE. + +Signed-off-by: Helge Deller <deller@gmx.de> +Acked-by: Hugh Dickins <hughd@google.com> +Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> +Signed-off-by: Willy Tarreau <w@1wt.eu> +Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org> +--- + mm/mmap.c | 13 ++++++++----- + 1 file changed, 8 insertions(+), 5 deletions(-) + +diff --git a/mm/mmap.c b/mm/mmap.c +index 4a113e3..16aeffc 100644 +--- a/mm/mmap.c ++++ b/mm/mmap.c +@@ -2129,16 +2129,19 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) + if (!(vma->vm_flags & VM_GROWSUP)) + return -EFAULT; + +- /* Guard against wrapping around to address 0. */ ++ /* Guard against exceeding limits of the address space. */ + address &= PAGE_MASK; +- address += PAGE_SIZE; +- if (!address) ++ if (address >= TASK_SIZE) + return -ENOMEM; ++ address += PAGE_SIZE; + + /* Enforce stack_guard_gap */ + gap_addr = address + stack_guard_gap; +- if (gap_addr < address) +- return -ENOMEM; ++ ++ /* Guard against overflow */ ++ if (gap_addr < address || gap_addr > TASK_SIZE) ++ gap_addr = TASK_SIZE; ++ + next = vma->vm_next; + if (next && next->vm_start < gap_addr) { + if (!(next->vm_flags & VM_GROWSUP)) +-- +2.1.4 + |