diff options
| author | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2012-02-15 11:32:31 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-04 09:49:20 -0800 |
| commit | 462808d8e21fcfa8e731d0cddd469d1ba92ac575 (patch) | |
| tree | 5f4bea10f0b4f2e46cf0f4d152dc0a423661f09e | |
| parent | e200edb226a0357d554039c4ff1847c6c03724c7 (diff) | |
| download | lwn-462808d8e21fcfa8e731d0cddd469d1ba92ac575.tar.gz lwn-462808d8e21fcfa8e731d0cddd469d1ba92ac575.zip | |
eCryptfs: Remove mmap from directory operations
backported from 38e3eaeedcac75360af8a92e7b66956ec4f334e5
Adrian reported that mkfontscale didn't work inside of eCryptfs mounts.
Strace revealed the following:
open("./", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
fcntl64(3, F_GETFD) = 0x1 (flags FD_CLOEXEC)
open("./fonts.scale", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
getdents(3, /* 80 entries */, 32768) = 2304
open("./.", O_RDONLY) = 5
fcntl64(5, F_SETFD, FD_CLOEXEC) = 0
fstat64(5, {st_mode=S_IFDIR|0755, st_size=16384, ...}) = 0
mmap2(NULL, 16384, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb7fcf000
close(5) = 0
--- SIGBUS (Bus error) @ 0 (0) ---
+++ killed by SIGBUS +++
The mmap2() on a directory was successful, resulting in a SIGBUS
signal later. This patch removes mmap() from the list of possible
ecryptfs_dir_fops so that mmap() isn't possible on eCryptfs directory
files.
http://bugs.launchpad.net/bugs/400443
Reported-by: Adrian C. <anrxc@sysphere.org>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ecryptfs/file.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index 4e25328986ac..d8adc511004e 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -327,7 +327,6 @@ const struct file_operations ecryptfs_dir_fops = { #ifdef CONFIG_COMPAT .compat_ioctl = ecryptfs_compat_ioctl, #endif - .mmap = generic_file_mmap, .open = ecryptfs_open, .flush = ecryptfs_flush, .release = ecryptfs_release, |