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| author |   Heiko Carstens <hca@linux.ibm.com> | 2020-09-09 17:10:29 +0200 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2020-09-14 11:38:35 +0200 |
| commit | 08c8e685c7c9223f9c4ad6365e02bebd3f106480 (patch) | |
| tree | 0125da74f6c62816182837dfcae925c640fbc4a0 /arch/s390/mm/init.c | |
| parent | s390/mm,ptdump: make page table dumping seq_file optional (diff) | |
| download | linux-dev-08c8e685c7c9223f9c4ad6365e02bebd3f106480.tar.xz linux-dev-08c8e685c7c9223f9c4ad6365e02bebd3f106480.zip | |
s390: add ARCH_HAS_DEBUG_WX support
Checks the whole kernel address space for W+X mappings. Note that
currently the first lowcore page unfortunately has to be mapped
W+X. Therefore this not reported as an insecure mapping.
For the very same reason the wording is also different to other
architectures if the test passes:
On s390 it is "no unexpected W+X pages found" instead of
"no W+X pages found".
Tested-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/mm/init.c')
| -rw-r--r-- | arch/s390/mm/init.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 0d282081dc1f..d3ddb4361361 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -34,6 +34,7 @@ #include <asm/processor.h> #include <linux/uaccess.h> #include <asm/pgalloc.h> +#include <asm/ptdump.h> #include <asm/dma.h> #include <asm/lowcore.h> #include <asm/tlb.h> @@ -129,6 +130,7 @@ void mark_rodata_ro(void) set_memory_ro((unsigned long)__start_ro_after_init, size >> PAGE_SHIFT); pr_info("Write protected read-only-after-init data: %luk\n", size >> 10); + debug_checkwx(); } int set_memory_encrypted(unsigned long addr, int numpages) |