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[S390] Write protect module text and RO data

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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>
This commit is contained in:
Jan Glauber
2011-03-15 17:08:22 +01:00
committed by Martin Schwidefsky
parent d54cddb620
commit 305b152325
4 changed files with 63 additions and 0 deletions
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4
arch/s390/include/asm/cacheflush.h
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@@ -8,4 +8,8 @@
void kernel_map_pages(struct page *page, int numpages, int enable);
#endif
int set_memory_ro(unsigned long addr, int numpages);
int set_memory_rw(unsigned long addr, int numpages);
int set_memory_nx(unsigned long addr, int numpages);
#endif /* _S390_CACHEFLUSH_H */