[PATCH v6 18/19] powerpc/mm: Switch some TASK_SIZE checks to use mm_context addr_limit
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2017-03-30 12:04:34
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
From: "Aneesh Kumar K.V" <redacted> Signed-off-by: Aneesh Kumar K.V <redacted> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/mm/hugetlbpage-radix.c | 4 ++-- arch/powerpc/mm/mmap.c | 12 ++++++------ arch/powerpc/mm/slice.c | 6 +++--- arch/powerpc/mm/subpage-prot.c | 3 ++- 4 files changed, 13 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/mm/hugetlbpage-radix.c b/arch/powerpc/mm/hugetlbpage-radix.c
index 35254a678456..95207c117b82 100644
--- a/arch/powerpc/mm/hugetlbpage-radix.c
+++ b/arch/powerpc/mm/hugetlbpage-radix.c@@ -52,7 +52,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr, if (len & ~huge_page_mask(h)) return -EINVAL; - if (len > TASK_SIZE) + if (len > mm->context.addr_limit) return -ENOMEM; if (flags & MAP_FIXED) {
@@ -64,7 +64,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr, if (addr) { addr = ALIGN(addr, huge_page_size(h)); vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && + if (mm->context.addr_limit - len >= addr && (!vma || addr + len <= vma->vm_start)) return addr; }
diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
index a5d9ef59debe..6e9fead92969 100644
--- a/arch/powerpc/mm/mmap.c
+++ b/arch/powerpc/mm/mmap.c@@ -97,7 +97,7 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr, struct vm_area_struct *vma; struct vm_unmapped_area_info info; - if (len > TASK_SIZE - mmap_min_addr) + if (len > mm->context.addr_limit - mmap_min_addr) return -ENOMEM; if (flags & MAP_FIXED)
@@ -106,7 +106,7 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr, if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && + if (mm->context.addr_limit - len >= addr && addr >= mmap_min_addr && (!vma || addr + len <= vma->vm_start)) return addr; }
@@ -114,7 +114,7 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr, info.flags = 0; info.length = len; info.low_limit = mm->mmap_base; - info.high_limit = TASK_SIZE; + info.high_limit = mm->context.addr_limit; info.align_mask = 0; return vm_unmapped_area(&info); }
@@ -132,7 +132,7 @@ radix__arch_get_unmapped_area_topdown(struct file *filp, struct vm_unmapped_area_info info; /* requested length too big for entire address space */ - if (len > TASK_SIZE - mmap_min_addr) + if (len > mm->context.addr_limit - mmap_min_addr) return -ENOMEM; if (flags & MAP_FIXED)
@@ -142,7 +142,7 @@ radix__arch_get_unmapped_area_topdown(struct file *filp, if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && + if (mm->context.addr_limit - len >= addr && addr >= mmap_min_addr && (!vma || addr + len <= vma->vm_start)) return addr; }
@@ -164,7 +164,7 @@ radix__arch_get_unmapped_area_topdown(struct file *filp, VM_BUG_ON(addr != -ENOMEM); info.flags = 0; info.low_limit = TASK_UNMAPPED_BASE; - info.high_limit = TASK_SIZE; + info.high_limit = mm->context.addr_limit; addr = vm_unmapped_area(&info); }
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index a79a20d4cf99..bf41825054d0 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c@@ -277,7 +277,7 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm, info.align_offset = 0; addr = TASK_UNMAPPED_BASE; - while (addr < TASK_SIZE) { + while (addr < mm->context.addr_limit) { info.low_limit = addr; if (!slice_scan_available(addr, available, 1, &addr)) continue;
@@ -289,8 +289,8 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm, * Check if we need to reduce the range, or if we can * extend it to cover the next available slice. */ - if (addr >= TASK_SIZE) - addr = TASK_SIZE; + if (addr >= mm->context.addr_limit) + addr = mm->context.addr_limit; else if (slice_scan_available(addr, available, 1, &next_end)) { addr = next_end; goto next_slice;
diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c
index 94210940112f..a409f78d206b 100644
--- a/arch/powerpc/mm/subpage-prot.c
+++ b/arch/powerpc/mm/subpage-prot.c@@ -197,7 +197,8 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map) /* Check parameters */ if ((addr & ~PAGE_MASK) || (len & ~PAGE_MASK) || - addr >= TASK_SIZE || len >= TASK_SIZE || addr + len > TASK_SIZE) + addr >= mm->context.addr_limit || len >= mm->context.addr_limit || + addr + len > mm->context.addr_limit) return -EINVAL; if (is_hugepage_only_range(mm, addr, len))
--
2.7.4