Thomas Gleixner bc791e8195 x86/irq/64: Limit IST stack overflow check to #DB stack ... [ Upstream commit 7dbcf2b0b770eeb803a416ee8dcbef78e6389d40 ] Commit 37fe6a42b3 ("x86: Check stack overflow in detail") added a broad check for the full exception stack area, i.e. it considers the full exception stack area as valid. That's wrong in two aspects: 1) It does not check the individual areas one by one 2) #DF, NMI and #MCE are not enabling interrupts which means that a regular device interrupt cannot happen in their context. In fact if a device interrupt hits one of those IST stacks that's a bug because some code path enabled interrupts while handling the exception. Limit the check to the #DB stack and consider all other IST stacks as 'overflow' or invalid. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Cc: Nicolai Stange <nstange@suse.de> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190414160143.682135110@linutronix.de Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-06-11 12:23:59 +02:00
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alpha	alpha: Fix Eiger NR_IRQS to 128	2019-02-20 10:13:22 +01:00
arc	ARC: uacces: remove lp_start, lp_end from clobber list	2019-03-23 08:44:34 +01:00
arm	KVM: arm/arm64: Ensure vcpu target is unset on reset failure	2019-06-11 12:23:49 +02:00
arm64	arm64: futex: Restore oldval initialization to work around buggy compilers	2019-04-27 09:34:01 +02:00
avr32
blackfin
c6x
cris
frv
h8300	h8300: use cc-cross-prefix instead of hardcoding h8300-unknown-linux-	2019-04-27 09:33:48 +02:00
hexagon
ia64
m32r
m68k	m68k: Add -ffreestanding to CFLAGS	2019-03-23 08:44:36 +01:00
metag
microblaze
mips	MIPS: scall64-o32: Fix indirect syscall number load	2019-05-16 19:44:43 +02:00
mn10300
nios2
openrisc
parisc
powerpc	powerpc/numa: improve control of topology updates	2019-06-11 12:23:58 +02:00
s390	s390/smp: Fix calling smp_call_ipl_cpu() from ipl CPU	2019-02-06 19:43:05 +01:00
score
sh
sparc
tile
um	um: Avoid marking pages with "changed protection"	2019-02-20 10:13:13 +01:00
unicore32
x86	x86/irq/64: Limit IST stack overflow check to #DB stack	2019-06-11 12:23:59 +02:00
xtensa	xtensa: fix return_address	2019-04-27 09:33:56 +02:00
.gitignore
Kconfig