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docs: admin-guide: document the kernel.modprobe sysctl
Document the kernel.modprobe sysctl in the same place that all the other kernel.* sysctls are documented. Make sure to mention how to use this sysctl to completely disable module autoloading, and how this sysctl relates to CONFIG_STATIC_USERMODEHELPER. [ebiggers@google.com: v5] Link: http://lkml.kernel.org/r/20200318230515.171692-4-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jeff Vander Stoep <jeffv@google.com> Cc: Jessica Yu <jeyu@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: NeilBrown <neilb@suse.com> Link: http://lkml.kernel.org/r/20200312202552.241885-4-ebiggers@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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successful IPC object allocation. If an IPC object allocation syscall
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fails, it is undefined if the value remains unmodified or is reset to -1.
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modprobe:
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=========
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The path to the usermode helper for autoloading kernel modules, by
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default "/sbin/modprobe". This binary is executed when the kernel
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requests a module. For example, if userspace passes an unknown
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filesystem type to mount(), then the kernel will automatically request
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the corresponding filesystem module by executing this usermode helper.
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This usermode helper should insert the needed module into the kernel.
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This sysctl only affects module autoloading. It has no effect on the
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ability to explicitly insert modules.
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If this sysctl is set to the empty string, then module autoloading is
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completely disabled. The kernel will not try to execute a usermode
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helper at all, nor will it call the kernel_module_request LSM hook.
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If CONFIG_STATIC_USERMODEHELPER=y is set in the kernel configuration,
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then the configured static usermode helper overrides this sysctl,
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except that the empty string is still accepted to completely disable
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module autoloading as described above.
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nmi_watchdog
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============
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