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| author | Vivien Didelot <vivien.didelot@savoirfairelinux.com> | 2015-03-12 09:58:27 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-25 13:27:57 +0100 |
| commit | d8bf8c92e80fed9119eb222c7e5cc88acf57c12c (patch) | |
| tree | 76781b5c56d41e896e0b29cc0cd7e884ee4a22b8 | |
| parent | da4759c73b0f1aac79f37bdb39ad2124439c30e7 (diff) | |
| download | linux-stable-d8bf8c92e80fed9119eb222c7e5cc88acf57c12c.tar.gz linux-stable-d8bf8c92e80fed9119eb222c7e5cc88acf57c12c.tar.bz2 linux-stable-d8bf8c92e80fed9119eb222c7e5cc88acf57c12c.zip | |
sysfs: Only accept read/write permissions for file attributes
For sysfs file attributes, only read and write permissions make sense.
Mask provided attribute permissions accordingly and send a warning
to the console if invalid permission bits are set.
This patch is originally from Guenter [1] and includes the fixup
explained in the thread, that is printing permissions in octal format
and limiting the scope of attributes to SYSFS_PREALLOC | 0664.
[1] https://lkml.org/lkml/2015/1/19/599
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/sysfs/group.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 3fdccd99a9d9..b400c04371f0 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -55,6 +55,12 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj, if (!mode) continue; } + + WARN(mode & ~(SYSFS_PREALLOC | 0664), + "Attribute %s: Invalid permissions 0%o\n", + (*attr)->name, mode); + + mode &= SYSFS_PREALLOC | 0664; error = sysfs_add_file_mode_ns(parent, *attr, false, mode, NULL); if (unlikely(error)) |