Tyler Hicks 0f751e641a eCryptfs: Extend array bounds for all filename chars ... From mhalcrow's original commit message: Characters with ASCII values greater than the size of filename_rev_map[] are valid filename characters. ecryptfs_decode_from_filename() will access kernel memory beyond that array, and ecryptfs_parse_tag_70_packet() will then decrypt those characters. The attacker, using the FNEK of the crafted file, can then re-encrypt the characters to reveal the kernel memory past the end of the filename_rev_map[] array. I expect low security impact since this array is statically allocated in the text area, and the amount of memory past the array that is accessible is limited by the largest possible ASCII filename character. This patch solves the issue reported by mhalcrow but with an implementation suggested by Linus to simply extend the length of filename_rev_map[] to 256. Characters greater than 0x7A are mapped to 0x00, which is how invalid characters less than 0x7A were previously being handled. Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Reported-by: Michael Halcrow <mhalcrow@google.com> Cc: stable@kernel.org		2011-11-23 15:43:53 -06:00
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crypto.c
debug.c
dentry.c
ecryptfs_kernel.h
file.c
inode.c
Kconfig
keystore.c
kthread.c
main.c
Makefile
messaging.c
miscdev.c
mmap.c
read_write.c
super.c