Daniel Cashman ec9ee4acd9 drivers: char: random: add get_random_long() ... Commit d07e22597d ("mm: mmap: add new /proc tunable for mmap_base ASLR") added the ability to choose from a range of values to use for entropy count in generating the random offset to the mmap_base address. The maximum value on this range was set to 32 bits for 64-bit x86 systems, but this value could be increased further, requiring more than the 32 bits of randomness provided by get_random_int(), as is already possible for arm64. Add a new function: get_random_long() which more naturally fits with the mmap usage of get_random_int() but operates exactly the same as get_random_int(). Also, fix the shifting constant in mmap_rnd() to be an unsigned long so that values greater than 31 bits generate an appropriate mask without overflow. This is especially important on x86, as its shift instruction uses a 5-bit mask for the shift operand, which meant that any value for mmap_rnd_bits over 31 acts as a no-op and effectively disables mmap_base randomization. Finally, replace calls to get_random_int() with get_random_long() where appropriate. This patch (of 2): Add get_random_long(). Signed-off-by: Daniel Cashman <dcashman@android.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: David S. Miller <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Nick Kralevich <nnk@google.com> Cc: Jeff Vander Stoep <jeffv@google.com> Cc: Mark Salyzyn <salyzyn@android.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-02-27 10:28:52 -08:00
..
agp
hw_random	hwrng: stm32 - Fix dependencies for !HAS_IOMEM archs	2016-01-26 22:27:34 +08:00
ipmi	ipmi: put acpi.h with the other headers	2016-02-03 10:35:52 -06:00
mwave
pcmcia
tpm
xilinx_hwicap
xillybus
apm-emulation.c
applicom.c
applicom.h
bfin-otp.c
bsr.c
ds1302.c
ds1620.c
dsp56k.c
dtlk.c
efirtc.c
generic_nvram.c
genrtc.c
hangcheck-timer.c
hpet.c	hpet: Drop stale URLs	2016-02-17 09:39:56 +01:00
Kconfig
lp.c
Makefile
mbcs.c
mbcs.h
mem.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
misc.c
mmtimer.c
mspec.c	tree wide: use kvfree() than conditional kfree()/vfree()	2016-01-22 17:02:18 -08:00
nsc_gpio.c
nvram.c
nwbutton.c
nwbutton.h
nwflash.c
pc8736x_gpio.c
ppdev.c
ps3flash.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
random.c	drivers: char: random: add get_random_long()	2016-02-27 10:28:52 -08:00
raw.c	block: use bd{grab,put}() instead of open-coding	2016-01-13 10:24:27 -07:00
rtc.c
scx200_gpio.c
snsc.c
snsc.h
snsc_event.c
sonypi.c
tb0219.c
tile-srom.c
tlclk.c
toshiba.c
ttyprintk.c
uv_mmtimer.c
virtio_console.c