CONFIG_STRICT_SIGALTSTACK_SIZE: Enforce strict size checking for sigaltstack

General informations

The Linux kernel configuration item CONFIG_STRICT_SIGALTSTACK_SIZE:

• prompt: Enforce strict size checking for sigaltstack
• type: bool
• depends on: CONFIG_DYNAMIC_SIGFRAME
• defined in arch/x86/Kconfig
• found in Linux kernels: 5.16–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

For historical reasons MINSIGSTKSZ is a constant which became already too small with AVX512 support. Add a mechanism to enforce strict checking of the sigaltstack size against the real size of the FPU frame. This option enables the check by default. It can also be controlled via the kernel command line option 'strict_sas_size' independent of this config switch. Enabling it might break existing applications which allocate a too small sigaltstack but 'work' because they never get a signal delivered.

Say 'N' unless you want to really enforce this check.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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