I want to know more datail about this. As I know, android platform is using binder mechanism, and binder is using mmap mechanism. Iliyan Malchev fixed mmap size, 4KB -> 32KB.
Does it affect to platform's performance and security? Just I read the comment, that's no related to performance and security. And linux kernel recommend 4KB minimal mmap size. If there are no issue, I think it's not necessary to change. [ARM] msm: msm_defconfig: increase mmap_min_addr to 32k 06/14006/2 author Iliyan Malchev <malc...@google.com> Wed, 17 Mar 2010 20:58:55 +0000 (13:58 -0700) committer Iliyan Malchev <malc...@google.com> Thu, 18 Mar 2010 04:21:29 +0000 (21:21 -0700) commit f797f5b9a88eb92e7834f0862857d047fc1031cd tree f07c25347d422a2822d5ef042f2fbb1aa15c52dc tree | snapshot parent 4a8b102321f02bd4959f4a233535b3c6effa85c4 commit | diff [ARM] msm: msm_defconfig: increase mmap_min_addr to 32k A lot of kernel structures are larger than 4k, and so NULL-pointer dereferences could still be exploitable. index 46bc204..7a9fe0d 100755 (executable) --- a/arch/arm/configs/msm_defconfig +++ b/arch/arm/configs/msm_defconfig @@ -292,7 +292,7 @@ CONFIG_ZONE_DMA_FLAG=0 CONFIG_VIRT_TO_BUS=y CONFIG_UNEVICTABLE_LRU=y CONFIG_ALIGNMENT_TRAP=y -CONFIG_DEFAULT_MMAP_MIN_ADDR=4096 +CONFIG_DEFAULT_MMAP_MIN_ADDR=32768 # # Boot options -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
