diff options
| author | Shaokun Zhang <zhangshaokun@hisilicon.com> | 2016-06-21 15:32:57 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-07-27 08:42:16 -0700 |
| commit | bd1e0058614563ba855974bf7c65da2f21124df5 (patch) | |
| tree | 229329210e4390300cc395ffdc1632a5f4238ee2 /net/unix/af_unix.c | |
| parent | e75da3fe88133b6e6822f9098aabb893e98a799e (diff) | |
arm64: mm: remove page_mapping check in __sync_icache_dcache
commit 20c27a4270c775d7ed661491af8ac03264d60fc6 upstream.
__sync_icache_dcache unconditionally skips the cache maintenance for
anonymous pages, under the assumption that flushing is only required in
the presence of D-side aliases [see 7249b79f6b4cc ("arm64: Do not flush
the D-cache for anonymous pages")].
Unfortunately, this breaks migration of anonymous pages holding
self-modifying code, where userspace cannot be reasonably expected to
reissue maintenance instructions in response to a migration.
This patch fixes the problem by removing the broken page_mapping(page)
check from the cache syncing code, otherwise we may end up fetching and
executing stale instructions from the PoU.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions