diff options
Diffstat (limited to '0004-powerpc-64s-hash-Fix-fork-with-512TB-process-address.patch')
| -rw-r--r-- | 0004-powerpc-64s-hash-Fix-fork-with-512TB-process-address.patch | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/0004-powerpc-64s-hash-Fix-fork-with-512TB-process-address.patch b/0004-powerpc-64s-hash-Fix-fork-with-512TB-process-address.patch deleted file mode 100644 index 75d9d3241..000000000 --- a/0004-powerpc-64s-hash-Fix-fork-with-512TB-process-address.patch +++ /dev/null @@ -1,48 +0,0 @@ -From fe50aa4374f20333d9b077bbe09397d38112b081 Mon Sep 17 00:00:00 2001 -From: Nicholas Piggin <npiggin@gmail.com> -Date: Tue, 28 Nov 2017 11:26:57 +0100 -Subject: [PATCH 4/5] powerpc/64s/hash: Fix fork() with 512TB process address - space - -commit effc1b25088502fbd30305c79773de2d1f7470a6 upstream. - -Hash unconditionally resets the addr_limit to default (128TB) when the -mm context is initialised. If a process has > 128TB mappings when it -forks, the child will not get the 512TB addr_limit, so accesses to -valid > 128TB mappings will fail in the child. - -Fix this by only resetting the addr_limit to default if it was 0. Non -zero indicates it was duplicated from the parent (0 means exec()). - -Fixes: f4ea6dcb08ea ("powerpc/mm: Enable mappings above 128TB") -Signed-off-by: Nicholas Piggin <npiggin@gmail.com> -Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> -Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - arch/powerpc/mm/mmu_context_book3s64.c | 8 ++++---- - 1 file changed, 4 insertions(+), 4 deletions(-) - -diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c -index a75f63833284..bb9cdf01fc4f 100644 ---- a/arch/powerpc/mm/mmu_context_book3s64.c -+++ b/arch/powerpc/mm/mmu_context_book3s64.c -@@ -95,11 +95,11 @@ static int hash__init_new_context(struct mm_struct *mm) - return index; - - /* -- * We do switch_slb() early in fork, even before we setup the -- * mm->context.addr_limit. Default to max task size so that we copy the -- * default values to paca which will help us to handle slb miss early. -+ * In the case of exec, use the default limit, -+ * otherwise inherit it from the mm we are duplicating. - */ -- mm->context.addr_limit = DEFAULT_MAP_WINDOW_USER64; -+ if (!mm->context.addr_limit) -+ mm->context.addr_limit = DEFAULT_MAP_WINDOW_USER64; - - /* - * The old code would re-promote on fork, we don't do that when using --- -2.14.3 - |