Will Deacon 6e693b3ffe x86: uaccess: Inhibit speculation past access_ok() in user_access_begin() ... Commit 594cc251fd ("make 'user_access_begin()' do 'access_ok()'") makes the access_ok() check part of the user_access_begin() preceding a series of 'unsafe' accesses. This has the desirable effect of ensuring that all 'unsafe' accesses have been range-checked, without having to pick through all of the callsites to verify whether the appropriate checking has been made. However, the consolidated range check does not inhibit speculation, so it is still up to the caller to ensure that they are not susceptible to any speculative side-channel attacks for user addresses that ultimately fail the access_ok() check. This is an oversight, so use __uaccess_begin_nospec() to ensure that speculation is inhibited until the access_ok() check has passed. Reported-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-01-20 15:33:22 +12:00
..
boot	kbuild: remove redundant target cleaning on failure	2019-01-06 09:46:51 +09:00
configs
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-12-27 13:53:32 -08:00
entry	jump_label: move 'asm goto' support test to Kconfig	2019-01-06 09:46:51 +09:00
events	Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 17:03:51 -08:00
hyperv
ia32	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
include	x86: uaccess: Inhibit speculation past access_ok() in user_access_begin()	2019-01-20 15:33:22 +12:00
kernel	x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE	2019-01-09 10:35:56 +01:00
kvm	x86/kvm/nVMX: don't skip emulated instruction twice when vmptr address is not backed	2019-01-11 18:41:53 +01:00
lib	kbuild: remove redundant target cleaning on failure	2019-01-06 09:46:51 +09:00
math-emu	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
mm	Merge branch 'akpm' (patches from Andrew)	2019-01-05 09:16:18 -08:00
net
oprofile
pci	pci-v4.21-changes	2019-01-05 17:57:34 -08:00
platform	Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-12-26 18:42:51 -08:00
power
purgatory
ras
realmode
tools
um	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
video
xen	xen: fixes for 5.0-rc3	2019-01-19 05:53:41 +12:00
.gitignore
Kbuild
Kconfig	x86/intel/lpss: Make PCI dependency explicit	2019-01-15 23:17:28 +01:00
Kconfig.cpu
Kconfig.debug
Makefile	jump_label: move 'asm goto' support test to Kconfig	2019-01-06 09:46:51 +09:00
Makefile_32.cpu
Makefile.um