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linux-stable/drivers/char
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Daniel Borkmann d4c5efdb97 random: add and use memzero_explicit() for clearing data 
zatimend has reported that in his environment (3.16/gcc4.8.3/corei7)
memset() calls which clear out sensitive data in extract_{buf,entropy,
entropy_user}() in random driver are being optimized away by gcc.

Add a helper memzero_explicit() (similarly as explicit_bzero() variants)
that can be used in such cases where a variable with sensitive data is
being cleared out in the end. Other use cases might also be in crypto
code. [ I have put this into lib/string.c though, as it's always built-in
and doesn't need any dependencies then. ]

Fixes kernel bugzilla: 82041

Reported-by: zatimend@hotmail.co.uk
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
2014-10-17 11:37:29 -04:00
..
agp agp: remove read/write stubs 2014-08-02 06:43:51 +10:00
hw_random virtio: rng: add derating factor for use by hwrng core 2014-08-15 10:26:01 +05:30
ipmi Merge branch 'sched/urgent' into sched/core, to avoid conflicts 2014-05-07 13:15:46 +02:00
mwave drivers/char: delete non-required instances of include <linux/init.h> 2014-02-07 15:10:19 -08:00
pcmcia char: synclink: Remove WARN_ON for bad port count 2014-07-10 16:07:46 -07:00
tpm tpm: simplify code by using %*phN specifier 2014-07-29 23:10:56 +02:00
xilinx_hwicap char: xilinx_hwicap: missing error code if ioremap() fails 2014-07-09 16:59:58 -07:00
apm-emulation.c apm-emulation: add hibernation APM events to support suspend2disk 2014-01-07 13:50:28 +01:00
applicom.c applicom: dereferencing NULL on error path 2014-05-27 17:43:12 -07:00
applicom.h
bfin-otp.c
bsr.c bsr: avoid format string leaking into device name 2014-07-09 16:59:15 -07:00
ds1302.c
ds1620.c ds1620: single_open() leak 2013-05-05 00:11:29 -04:00
dsp56k.c drivers/char/dsp56k.c: drop check for negativity of unsigned parameter 2014-07-17 18:38:37 -07:00
dtlk.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
efirtc.c rtc: single_open() leaks 2013-05-05 00:12:29 -04:00
generic_nvram.c
genrtc.c rtc: single_open() leaks 2013-05-05 00:12:29 -04:00
hangcheck-timer.c hangcheck-timer: Use ktime_get_ns() 2014-07-23 15:01:49 -07:00
hpet.c ACPI: Clean up inclusions of ACPI header files 2013-12-07 01:03:14 +01:00
i8k.c Merge 3.16-rc5 into char-misc-next 2014-07-13 15:26:47 -07:00
Kconfig ttyprintk: Allow built as a module 2014-04-16 14:21:06 -07:00
lp.c char: Int overflow in lp_do_ioctl(). 2013-12-18 16:39:54 -08:00
Makefile Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-01-29 20:49:12 -08:00
mbcs.c char: remove use of __devinitconst 2012-11-21 12:55:19 -08:00
mbcs.h
mem.c /dev/mem: handle out-of-bounds read/write 2014-02-15 11:51:02 -08:00
misc.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-11-13 15:34:18 +09:00
mmtimer.c
msm_smd_pkt.c treewide: Fix typos in printk 2013-12-19 15:10:49 +01:00
mspec.c char: Use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT 2013-05-21 10:07:54 -07:00
nsc_gpio.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
nvram.c
nwbutton.c char: nwbutton: open-code interruptible_sleep_on 2014-01-08 15:29:52 -08:00
nwbutton.h
nwflash.c
pc8736x_gpio.c pc8736x_gpio: use platform_device_unregister in pc8736x_gpio_cleanup() 2012-10-24 15:52:29 -07:00
ppdev.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
ps3flash.c ps3flash: switch to generic_file_llseek_size() 2013-06-29 12:57:33 +04:00
random.c random: add and use memzero_explicit() for clearing data 2014-10-17 11:37:29 -04:00
raw.c blkdev_aio_write() - turn into blkdev_write_iter() 2014-05-06 17:38:01 -04:00
rtc.c various char drivers: remove deprecated IRQF_DISABLED 2013-10-16 12:36:10 -07:00
scx200_gpio.c
snsc.c various char drivers: remove deprecated IRQF_DISABLED 2013-10-16 12:36:10 -07:00
snsc.h
snsc_event.c various char drivers: remove deprecated IRQF_DISABLED 2013-10-16 12:36:10 -07:00
sonypi.c ACPI: Remove the old /proc/acpi/event interface 2013-07-15 13:56:36 +02:00
tb0219.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
tile-srom.c drivers/char: delete non-required instances of include <linux/init.h> 2014-02-07 15:10:19 -08:00
tlclk.c tlclk: remove deprecated IRQF_DISABLED 2013-10-16 12:36:10 -07:00
toshiba.c
ttyprintk.c ttyprintk: Allow built as a module 2014-04-16 14:21:06 -07:00
uv_mmtimer.c
virtio_console.c virtio: console: remove unnecessary null test before debugfs_remove_recursive 2014-07-27 21:07:14 +09:30