diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0025-kaiser-kaiser_remove_mapping-move-along-the-pgd.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0025-kaiser-kaiser_remove_mapping-move-along-the-pgd.patch | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0025-kaiser-kaiser_remove_mapping-move-along-the-pgd.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0025-kaiser-kaiser_remove_mapping-move-along-the-pgd.patch deleted file mode 100644 index ef6fe022..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0025-kaiser-kaiser_remove_mapping-move-along-the-pgd.patch +++ /dev/null @@ -1,52 +0,0 @@ -From 88ae1de3aa1ad852d683202954e7c3acb96f0d38 Mon Sep 17 00:00:00 2001 -From: Hugh Dickins <hughd@google.com> -Date: Mon, 2 Oct 2017 10:57:24 -0700 -Subject: [PATCH 025/103] kaiser: kaiser_remove_mapping() move along the pgd - -When removing the bogus comment from kaiser_remove_mapping(), -I really ought to have checked the extent of its bogosity: as -Neel points out, there is nothing to stop unmap_pud_range_nofree() -from continuing beyond the end of a pud (and starting in the wrong -position on the next). - -Fix kaiser_remove_mapping() to constrain the extent and advance pgd -pointer correctly: use pgd_addr_end() macro as used throughout base -mm (but don't assume page-rounded start and size in this case). - -But this bug was very unlikely to trigger in this backport: since -any buddy allocation is contained within a single pud extent, and -we are not using vmapped stacks (and are only mapping one page of -stack anyway): the only way to hit this bug here would be when -freeing a large modified ldt. - -Signed-off-by: Hugh Dickins <hughd@google.com> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/x86/mm/kaiser.c | 10 ++++++---- - 1 file changed, 6 insertions(+), 4 deletions(-) - -diff --git a/arch/x86/mm/kaiser.c b/arch/x86/mm/kaiser.c -index fa1cb09..cc0950f 100644 ---- a/arch/x86/mm/kaiser.c -+++ b/arch/x86/mm/kaiser.c -@@ -319,11 +319,13 @@ void kaiser_remove_mapping(unsigned long start, unsigned long size) - extern void unmap_pud_range_nofree(pgd_t *pgd, - unsigned long start, unsigned long end); - unsigned long end = start + size; -- unsigned long addr; -+ unsigned long addr, next; -+ pgd_t *pgd; - -- for (addr = start; addr < end; addr += PGDIR_SIZE) { -- pgd_t *pgd = native_get_shadow_pgd(pgd_offset_k(addr)); -- unmap_pud_range_nofree(pgd, addr, end); -+ pgd = native_get_shadow_pgd(pgd_offset_k(start)); -+ for (addr = start; addr < end; pgd++, addr = next) { -+ next = pgd_addr_end(addr, end); -+ unmap_pud_range_nofree(pgd, addr, next); - } - } - --- -2.7.4 - |