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authorPeter Zijlstra <peterz@infradead.org>2020-04-29 10:24:48 -0500
committerJiri Kosina <jkosina@suse.cz>2020-05-08 00:12:43 +0200
commitbe2422612a580e33b927d0cde7a5a3c7935b2849 (patch)
treedd82c3643cd41b9e01e60b4139b644d45dc963b8 /arch/um/kernel
parentcb2cceaefb4c4dc28fc27ff1f1b2d258bfc10353 (diff)
s390/module: Use s390_kernel_write() for late relocations
Because of late module patching, a livepatch module needs to be able to apply some of its relocations well after it has been loaded. Instead of playing games with module_{dis,en}able_ro(), use existing text poking mechanisms to apply relocations after module loading. So far only x86, s390 and Power have HAVE_LIVEPATCH but only the first two also have STRICT_MODULE_RWX. This will allow removal of the last module_disable_ro() usage in livepatch. The ultimate goal is to completely disallow making executable mappings writable. [ jpoimboe: Split up patches. Use mod state to determine whether memcpy() can be used. Test and add fixes. ] Cc: linux-s390@vger.kernel.org Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> # s390 Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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