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authorDaniel Micay <danielmicay@gmail.com>2017-02-27 14:28:03 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-27 18:43:46 -0800
commit2d75cb59a5c6ade417d3c8b7f3654408ca6a71d5 (patch)
treee5fd7bb10994ba2435f3d6573c63fbcd822edf71
parentb3b42c0deaa1a2fb84508b808385b8a78819f4df (diff)
config: android-recommended: disable aio support
The aio interface adds substantial attack surface for a feature that's not being exposed by Android at all. It's unlikely that anyone is using the kernel feature directly either. This feature is rarely used even on servers. The glibc POSIX aio calls really use thread pools. The lack of widespread usage also means this is relatively poorly audited/tested. The kernel's aio rarely provides performance benefits over using a thread pool and is quite incomplete in terms of system call coverage along with having edge cases where blocking can occur. Part of the performance issue is the fact that it only supports direct io, not buffered io. The existing API is considered fundamentally flawed and it's unlikely it will be expanded, but rather replaced: https://marc.info/?l=linux-aio&m=145255815216051&w=2 Since ext4 encryption means no direct io support, kernel aio isn't even going to work properly on Android devices using file-based encryption. Reviewed-at: https://android-review.googlesource.com/#/c/292158/ Link: http://lkml.kernel.org/r/1481113148-29204-1-git-send-email-amit.pundir@linaro.org Signed-off-by: Daniel Micay <danielmicay@gmail.com> Signed-off-by: Amit Pundir <amit.pundir@linaro.org> Cc: Rob Herring <rob.herring@linaro.org> Cc: John Stultz <john.stultz@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/configs/android-recommended.config1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/configs/android-recommended.config b/kernel/configs/android-recommended.config
index 99127edc5204..28ee064b6744 100644
--- a/kernel/configs/android-recommended.config
+++ b/kernel/configs/android-recommended.config
@@ -1,4 +1,5 @@
# KEEP ALPHABETICALLY SORTED
+# CONFIG_AIO is not set
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
# CONFIG_INPUT_MOUSE is not set
# CONFIG_LEGACY_PTYS is not set