4.9-stable review patch. If anyone has any objections, please let me know.
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From: Hugh Dickins hughd@google.com
kaiser_add_user_map() took no notice when kaiser_pagetable_walk() failed. And avoid its might_sleep() when atomic (though atomic at present unused).
Signed-off-by: Hugh Dickins hughd@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/mm/kaiser.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
--- a/arch/x86/mm/kaiser.c +++ b/arch/x86/mm/kaiser.c @@ -98,11 +98,11 @@ static pte_t *kaiser_pagetable_walk(unsi pgd_t *pgd = native_get_shadow_pgd(pgd_offset_k(address)); gfp_t gfp = (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO);
- might_sleep(); if (is_atomic) { gfp &= ~GFP_KERNEL; gfp |= __GFP_HIGH | __GFP_ATOMIC; - } + } else + might_sleep();
if (pgd_none(*pgd)) { WARN_ONCE(1, "All shadow pgds should have been populated"); @@ -159,13 +159,17 @@ int kaiser_add_user_map(const void *__st unsigned long end_addr = PAGE_ALIGN(start_addr + size); unsigned long target_address;
- for (;address < end_addr; address += PAGE_SIZE) { + for (; address < end_addr; address += PAGE_SIZE) { target_address = get_pa_from_mapping(address); if (target_address == -1) { ret = -EIO; break; } pte = kaiser_pagetable_walk(address, false); + if (!pte) { + ret = -ENOMEM; + break; + } if (pte_none(*pte)) { set_pte(pte, __pte(flags | target_address)); } else {