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config: kernel: add KERNEL_X86_VSYSCALL_EMULATION

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Binaries in container images may need this.  E.g. nginx:1.7.9 used in
k8s default deployment manifest file for demostration [1]

 [1] https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#creating-a-deployment

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
This commit is contained in:
Yousong Zhou
2019-08-27 03:52:56 +00:00
parent 7489ea85a2
commit 083bb9b6a4
1 changed files with 18 additions and 0 deletions
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18
config/Config-kernel.in
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@@ -54,6 +54,24 @@ config KERNEL_ARM_PMU
default n default n
depends on (arm || aarch64) depends on (arm || aarch64)
config KERNEL_X86_VSYSCALL_EMULATION
bool "Enable vsyscall emulation"
default n
depends on x86_64
help
This enables emulation of the legacy vsyscall page. Disabling
it is roughly equivalent to booting with vsyscall=none, except
that it will also disable the helpful warning if a program
tries to use a vsyscall. With this option set to N, offending
programs will just segfault, citing addresses of the form
0xffffffffff600?00.
This option is required by many programs built before 2013, and
care should be used even with newer programs if set to N.
Disabling this option saves about 7K of kernel size and
possibly 4K of additional runtime pagetable memory.
config KERNEL_PERF_EVENTS config KERNEL_PERF_EVENTS
bool "Compile the kernel with performance events and counters" bool "Compile the kernel with performance events and counters"
default n default n