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Daniel Borkmann 25e1465ac3 random: add and use memzero_explicit() for clearing data 
commit d4c5efdb97 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-11-14 08:47:55 -08:00
..
agp parisc: agp/parisc-agp: allow binding of user memory to the AGP GART 2013-08-11 18:35:20 -07:00
hw_random hwrng: bcm2835: fix MODULE_LICENSE tag 2013-08-11 18:35:26 -07:00
ipmi ipmi: Reset the KCS timeout when starting error recovery 2014-06-07 13:25:30 -07:00
mwave 8250: three way resolve of the 8250 diffs 2012-07-17 09:11:50 -07:00
pcmcia Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
tpm tpm: Provide a generic means to override the chip returned timeouts 2014-09-17 09:04:02 -07:00
xilinx_hwicap char: remove use of __devexit 2012-11-21 12:55:19 -08:00
apm-emulation.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/apm 2012-04-05 17:34:30 -07:00
applicom.c applicom: dereferencing NULL on error path 2014-06-30 20:09:41 -07:00
applicom.h
bfin-otp.c
bsr.c powerpc/BSR: cleanup the error path of bsr_init 2012-07-17 10:27:38 -07:00
ds1302.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
ds1620.c ds1620: single_open() leak 2013-05-05 00:11:29 -04:00
dsp56k.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
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
hpet.c vm: convert HPET mmap to vm_iomap_memory() helper 2013-04-19 09:46:39 -07:00
i8k.c drivers/char/i8k.c: add Dell XPLS L421X 2013-12-11 22:36:29 -08:00
Kconfig tty: Added a CONFIG_TTY option to allow removal of TTY 2013-01-18 16:15:27 -08:00
lp.c Char: lp, protect LPGETSTATUS with port_mutex 2013-05-16 18:08:58 -07:00
Makefile IPMI: Change link order 2012-10-16 18:07:12 -07:00
mbcs.c char: remove use of __devinitconst 2012-11-21 12:55:19 -08:00
mbcs.h
mem.c aio: don't include aio.h in sched.h 2013-05-07 20:16:25 -07:00
misc.c drivers/char/misc.c:misc_register(): do not loop on misc_list unconditionally 2013-02-27 19:10:21 -08:00
mmtimer.c drivers/char/mmtimer.c: Remove useless kfree 2012-09-26 13:20:40 -07:00
msm_smd_pkt.c
mspec.c mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
nsc_gpio.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
nvram.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
nwbutton.c drivers/char: removes unnecessary semicolon 2012-09-26 13:20:39 -07:00
nwbutton.h
nwflash.c Merge branch 'late/fixes' into fixes 2012-10-07 07:22:32 -07:00
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 new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
random.c random: add and use memzero_explicit() for clearing data 2014-11-14 08:47:55 -08:00
raw.c raw: test against runtime value of max_raw_minors 2014-02-22 12:41:27 -08:00
rtc.c drivers/char: removes unnecessary semicolon 2012-09-26 13:20:39 -07:00
scx200_gpio.c
snsc.c
snsc.h
snsc_event.c
sonypi.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
tb0219.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
tile-srom.c drivers: char: Use PTR_RET function 2013-03-25 13:18:11 -07:00
tlclk.c drivers/char/tlclk.c: fix error return code 2012-08-16 10:09:15 -07:00
toshiba.c
ttyprintk.c ttyprintk: Fix NULL pointer deref by setting tty_port ops after initializing port 2013-05-21 10:13:23 -07:00
uv_mmtimer.c
virtio_console.c virtio: console: return -ENODEV on all read operations after unplug 2013-08-14 22:59:09 -07:00