305b152325
Implement write protection for kernel modules text and read-only data sections by implementing set_memory_[ro|rw] on s390. Since s390 has no execute bit in the pte's NX is not supported. set_memory_[ro|rw] will only work on normal pages and not on large pages, so in case a large page should be modified bail out with a warning. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
38 lines
1.0 KiB
Plaintext
38 lines
1.0 KiB
Plaintext
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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source "lib/Kconfig.debug"
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config STRICT_DEVMEM
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def_bool y
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prompt "Filter access to /dev/mem"
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---help---
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This option restricts access to /dev/mem. If this option is
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disabled, you allow userspace access to all memory, including
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kernel and userspace memory. Accidental memory access is likely
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to be disastrous.
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Memory access is required for experts who want to debug the kernel.
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If you are unsure, say Y.
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config DEBUG_STRICT_USER_COPY_CHECKS
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def_bool n
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prompt "Strict user copy size checks"
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---help---
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Enabling this option turns a certain set of sanity checks for user
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copy operations into compile time warnings.
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The copy_from_user() etc checks are there to help test if there
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are sufficient security checks on the length argument of
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the copy operation, by having gcc prove that the argument is
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within bounds.
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If unsure, or if you run an older (pre 4.4) gcc, say N.
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config DEBUG_SET_MODULE_RONX
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def_bool y
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depends on MODULES
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endmenu
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