hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Vivien Didelot 2015-03-12 09:58:27 -04:00 committed by Greg Kroah-Hartman
parent da4759c73b
commit d8bf8c92e8
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/sysfs/group.c
View File

@ -55,6 +55,12 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
if (!mode) if (!mode)
continue; 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, error = sysfs_add_file_mode_ns(parent, *attr, false,
mode, NULL); mode, NULL);
if (unlikely(error)) if (unlikely(error))