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authorAndy Lutomirski <luto@kernel.org>2017-07-26 17:16:30 +0300
committerIngo Molnar <mingo@kernel.org>2017-07-27 10:12:57 +0300
commita632375764aa25c97b78beb56c71b0ba59d1cf83 (patch)
tree367b9197b23b4010591750bff661656f7bce7a6e /include/linux/pm_runtime.h
parent81d387190039c14edac8de2b3ec789beb899afd9 (diff)
downloadlinux-a632375764aa25c97b78beb56c71b0ba59d1cf83.tar.xz
x86/ldt/64: Refresh DS and ES when modify_ldt changes an entry
On x86_32, modify_ldt() implicitly refreshes the cached DS and ES segments because they are refreshed on return to usermode. On x86_64, they're not refreshed on return to usermode. To improve determinism and match x86_32's behavior, refresh them when we update the LDT. This avoids a situation in which the DS points to a descriptor that is changed but the old cached segment persists until the next reschedule. If this happens, then the user-visible state will change nondeterministically some time after modify_ldt() returns, which is unfortunate. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bpetkov@suse.de> Cc: Chang Seok <chang.seok.bae@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/pm_runtime.h')
0 files changed, 0 insertions, 0 deletions