linux-stable/fs/sysfs
Joe Perches 5f42436428 sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output
commit 2efc459d06 upstream.

Output defects can exist in sysfs content using sprintf and snprintf.

sprintf does not know the PAGE_SIZE maximum of the temporary buffer
used for outputting sysfs content and it's possible to overrun the
PAGE_SIZE buffer length.

Add a generic sysfs_emit function that knows that the size of the
temporary buffer and ensures that no overrun is done.

Add a generic sysfs_emit_at function that can be used in multiple
call situations that also ensures that no overrun is done.

Validate the output buffer argument to be page aligned.
Validate the offset len argument to be within the PAGE_SIZE buf.

Signed-off-by: Joe Perches <joe@perches.com>
Link: https://lore.kernel.org/r/884235202216d464d61ee975f7465332c86f76b2.1600285923.git.joe@perches.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-07 12:20:48 +01:00
..
dir.c sysfs: convert BUG_ON to WARN_ON 2019-01-07 08:53:32 +01:00
file.c sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output 2021-03-07 12:20:48 +01:00
group.c sysfs: Add sysfs_update_groups function 2019-06-03 11:58:20 +02:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
mount.c no need to protect against put_user_ns(NULL) 2019-05-25 17:59:54 -04:00
symlink.c sysfs: convert BUG_ON to WARN_ON 2019-01-07 08:53:32 +01:00
sysfs.h sysfs, kobject: allow creating kobject belonging to arbitrary users 2018-07-20 23:44:35 -07:00