diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2019-04-14 17:59:38 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:43:31 -0700 |
commit | 5c907df83abe178590c9a7675a1b96a60f8e7a15 (patch) | |
tree | 313c999015f375a00cdbe4afc6d57b0e497d97e5 /drivers/cdrom | |
parent | abda52890034331e2dd12048b81843af0c510b16 (diff) |
x86/irq/64: Limit IST stack overflow check to #DB stack
[ Upstream commit 7dbcf2b0b770eeb803a416ee8dcbef78e6389d40 ]
Commit
37fe6a42b343 ("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>
Diffstat (limited to 'drivers/cdrom')
0 files changed, 0 insertions, 0 deletions