Hi,
This patch series adds the following three features about stack
overflow checking. The (2) and (3) features work if their options
are enabled.
(1) add user mode vm check
The kernel stack overflow is checked in stack_overflow_check(),
which may wrongly detect the overflow if the user stack pointer
pointed to the kernel stack accidentally. To avoid this misdetection,
bail out early if the user stack is used.
(2) check stack overflow in detail
Currently, only kernel stack is checked for the overflow,
which is not sufficient for enterprise systems. To enhance
reliability, expand stack overflow checking to IRQ and
exception stacks optionally. This is disabled by default
in Kconfig.
(3) panic on stack overflow
Currently, kernel messages are output on the detection of
stack overflow. Similarly, its's not sufficient for enterprise
systems since it may corrupt data. To enhance reliability,
cause a panic for the overflows according to the sysctl parameter.
This is disabled by default.
Thanks,
---
Mitsuo Hayasaka (5):
x86: change range of stack overflow checking
x86: panic on detection of stack overflow
x86: add a sysctl parameter to panic on stack overflow
x86: check stack overflow in detail
x86: add user_mode_vm check in stack_overflow_check
Documentation/sysctl/kernel.txt | 13 +++++++++++
arch/x86/Kconfig.debug | 11 +++++++++
arch/x86/kernel/irq_32.c | 2 ++
arch/x86/kernel/irq_64.c | 46 ++++++++++++++++++++++++++++++++++++---
include/linux/kernel.h | 1 +
include/linux/sysctl.h | 1 +
kernel/sysctl.c | 9 ++++++++
kernel/sysctl_binary.c | 1 +
8 files changed, 80 insertions(+), 4 deletions(-)
--
Mitsuo Hayasaka (mitsuo.hayasaka.hu@xxxxxxxxxxx)
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