diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-01 10:36:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-01 10:36:22 -0700 |
| commit | bba2a5b8221850418846d62887d5de311df335f9 (patch) | |
| tree | 129ade5d7f32fec65707a64a2d5ae19ca0167323 /arch | |
| parent | a1c516a60a702630347e27c7beb7f2f44ca7a8b5 (diff) | |
| parent | 0fdd49ad1bb17457d119f8c3bc8ecdd0734eed9c (diff) | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Martin Schwidefsky:
"Three more bug fixes for v4.13.
The two memory management related fixes are quite new, they fix kernel
crashes that can be triggered by user space.
The third commit fixes a bug in the vfio ccw translation code"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/mm: fix BUG_ON in crst_table_upgrade
s390/mm: fork vs. 5 level page tabel
vfio: ccw: fix bad ptr math for TIC cda translation
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 5 | ||||
| -rw-r--r-- | arch/s390/mm/mmap.c | 6 |
2 files changed, 9 insertions, 2 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index 4541ac44b35f..24bc41622a98 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -44,6 +44,11 @@ static inline int init_new_context(struct task_struct *tsk, mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | _ASCE_USER_BITS | _ASCE_TYPE_REGION3; break; + case -PAGE_SIZE: + /* forked 5-level task, set new asce with new_mm->pgd */ + mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | + _ASCE_USER_BITS | _ASCE_TYPE_REGION1; + break; case 1UL << 53: /* forked 4-level task, set new asce with new mm->pgd */ mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index 2e10d2b8ad35..5bea139517a2 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -119,7 +119,8 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, return addr; check_asce_limit: - if (addr + len > current->mm->context.asce_limit) { + if (addr + len > current->mm->context.asce_limit && + addr + len <= TASK_SIZE) { rc = crst_table_upgrade(mm, addr + len); if (rc) return (unsigned long) rc; @@ -183,7 +184,8 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, } check_asce_limit: - if (addr + len > current->mm->context.asce_limit) { + if (addr + len > current->mm->context.asce_limit && + addr + len <= TASK_SIZE) { rc = crst_table_upgrade(mm, addr + len); if (rc) return (unsigned long) rc; |