Maciej W. Rozycki b67336eee3 MIPS: Validate PR_SET_FP_MODE prctl(2) requests against the ABI of the task ... Fix an API loophole introduced with commit 9791554b45 ("MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS"), where the caller of prctl(2) is incorrectly allowed to make a change to CP0.Status.FR or CP0.Config5.FRE register bits even if CONFIG_MIPS_O32_FP64_SUPPORT has not been enabled, despite that an executable requesting the mode requested via ELF file annotation would not be allowed to run in the first place, or for n64 and n64 ABI tasks which do not have non-default modes defined at all. Add suitable checks to `mips_set_process_fp_mode' and bail out if an invalid mode change has been requested for the ABI in effect, even if the FPU hardware or emulation would otherwise allow it. Always succeed however without taking any further action if the mode requested is the same as one already in effect, regardless of whether any mode change, should it be requested, would actually be allowed for the task concerned. Signed-off-by: Maciej W. Rozycki <macro@mips.com> Fixes: 9791554b45 ("MIPS,prctl: add PR_[GS]ET_FP_MODE prctl options for MIPS") Reviewed-by: Paul Burton <paul.burton@mips.com> Cc: James Hogan <james.hogan@mips.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # 4.0+ Patchwork: https://patchwork.linux-mips.org/patch/17800/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		2017-12-20 11:55:43 +01:00
..
alchemy	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
ar7	MIPS: AR7: Ensure that serial ports are properly set up	2017-11-08 14:57:55 +00:00
ath25
ath79	Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2017-11-14 17:52:21 -08:00
bcm47xx	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
bcm63xx	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
bmips
boot	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
cavium-octeon	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
cobalt
configs	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
dec
emma
fw
generic	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
include	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-12-08 13:32:44 -08:00
jazz
jz4740
kernel	MIPS: Validate PR_SET_FP_MODE prctl(2) requests against the ABI of the task	2017-12-20 11:55:43 +01:00
kvm	KVM: Let KVM_SET_SIGNAL_MASK work as advertised	2017-11-27 17:53:47 +01:00
lantiq	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
lasat	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
lib
loongson32
loongson64
math-emu	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
mm	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
mti-malta	treewide: Switch DEFINE_TIMER callbacks to struct timer_list *	2017-11-21 15:57:05 -08:00
net
netlogic
oprofile
paravirt
pci	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
pic32
pistachio
pmcs-msp71xx
pnx833x
power
ralink	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
rb532
sgi-ip22	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-11-13 17:56:58 -08:00
sgi-ip27
sgi-ip32
sibyte
sni
tools
txx9
vdso
vr41xx
Kbuild
Kbuild.platforms	MIPS: Xilfpga: Switch to using generic defconfigs	2017-11-08 22:54:14 +00:00
Kconfig	MIPS changes for 4.15	2017-11-15 11:36:08 -08:00
Kconfig.debug
Makefile	MIPS: Xilfpga: Switch to using generic defconfigs	2017-11-08 22:54:14 +00:00
Makefile.postlink