Commit d93f82b6 authored Jun 12, 2009 by Heiko Carstens Committed by Martin Schwidefsky Jun 12, 2009

[S390] maccess: add weak attribute to probe_kernel_write



probe_kernel_write() gets used to write to the kernel address space.
E.g. to patch the kernel (kgdb, ftrace, kprobes...). Some architectures
however enable write protection for the kernel text section, so that
writes to this region would fault.
This patch allows to specify an architecture specific version of
probe_kernel_write() which allows to handle and bypass write protection
of the text segment.
That way it is still possible to catch random writes to kernel text
and explicitly allow writes via this interface.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent f3d0a0d9

mm/maccess.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -39,7 +39,7 @@ EXPORT_SYMBOL_GPL(probe_kernel_read);
		* Safely write to address @dst from the buffer at @src. If a kernel fault
		* happens, handle that and return -EFAULT.
		*/
		long probe_kernel_write(void dst, void src, size_t size)
		long notrace __weak probe_kernel_write(void dst, void src, size_t size)
		{
		long ret;
		mm_segment_t old_fs = get_fs();

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