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s390/kasan: make shadow memory noexec

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ARCH_HAS_DEBUG_WX feature support brought attention to the fact that
currently initial kasan shadow memory mapped without noexec flag. So fix that.

Temporary initial identity mapping is still created without noexec, but
it is replaced by properly set up paging later.

Signed-off-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>
This commit is contained in:
Vasily Gorbik 2020-09-10 22:25:13 +02:00
parent 08c8e685c7
commit d411e3c674
1 changed files with 6 additions and 2 deletions
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8
arch/s390/mm/kasan_init.c
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@ -99,8 +99,12 @@ static void __init kasan_early_vmemmap_populate(unsigned long address,
pgt_prot_zero = pgprot_val(PAGE_KERNEL_RO);
if (!has_nx)
pgt_prot_zero &= ~_PAGE_NOEXEC;
pgt_prot = pgprot_val(PAGE_KERNEL_EXEC);
sgt_prot = pgprot_val(SEGMENT_KERNEL_EXEC);
pgt_prot = pgprot_val(PAGE_KERNEL);
sgt_prot = pgprot_val(SEGMENT_KERNEL);
if (!has_nx || mode == POPULATE_ONE2ONE) {
pgt_prot &= ~_PAGE_NOEXEC;
sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC;
}
while (address < end) {
pg_dir = pgd_offset_k(address);