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mm: replace get_user_pages() write/force parameters with gup_flags 

This removes the 'write' and 'force' from get_user_pages() and replaces
them with 'gup_flags' to make the use of FOLL_FORCE explicit in callers
as use of this flag can result in surprising behaviour (and hence bugs)
within the mm subsystem.

Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2016-10-13 01:20:16 +01:00 committed by Linus Torvalds
parent 7f23b3504a
commit 768ae309a9
22 changed files with 49 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/cris/arch-v32/drivers/cryptocop.c
View File

@ -2722,7 +2722,6 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
err = get_user_pages((unsigned long int)(oper.indata + prev_ix),
noinpages,
0, /* read access only for in data */
0, /* no force */
inpages,
NULL);
@ -2736,8 +2735,7 @@ static int cryptocop_ioctl_process(struct inode *inode, struct file *filp, unsig
if (oper.do_cipher){
err = get_user_pages((unsigned long int)oper.cipher_outdata,
nooutpages,
1, /* write access for out data */
0, /* no force */
FOLL_WRITE, /* write access for out data */
outpages,
NULL);
up_read(&current->mm->mmap_sem);

2
arch/ia64/kernel/err_inject.c
View File

@ -142,7 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
u64 virt_addr=simple_strtoull(buf, NULL, 16);
int ret;
ret = get_user_pages(virt_addr, 1, VM_READ, 0, NULL, NULL);
ret = get_user_pages(virt_addr, 1, FOLL_WRITE, NULL, NULL);
if (ret<=0) {
#ifdef ERR_INJ_DEBUG
printk("Virtual address %lx is not existing.\n",virt_addr);

5
arch/x86/mm/mpx.c
View File

@ -544,10 +544,9 @@ static int mpx_resolve_fault(long __user *addr, int write)
{
long gup_ret;
int nr_pages = 1;
int force = 0;
gup_ret = get_user_pages((unsigned long)addr, nr_pages, write,
force, NULL, NULL);
gup_ret = get_user_pages((unsigned long)addr, nr_pages,
write ? FOLL_WRITE : 0, NULL, NULL);
/*
* get_user_pages() returns number of pages gotten.
* 0 means we failed to fault in and get anything,

7
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -555,10 +555,13 @@ struct amdgpu_ttm_tt {
int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
{
struct amdgpu_ttm_tt *gtt = (void *)ttm;
int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
unsigned int flags = 0;
unsigned pinned = 0;
int r;
if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
flags |= FOLL_WRITE;
if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
/* check that we only use anonymous memory
to prevent problems with writeback */
@ -581,7 +584,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages)
list_add(&guptask.list, &gtt->guptasks);
spin_unlock(&gtt->guptasklock);
r = get_user_pages(userptr, num_pages, write, 0, p, NULL);
r = get_user_pages(userptr, num_pages, flags, p, NULL);
spin_lock(&gtt->guptasklock);
list_del(&guptask.list);

3
drivers/gpu/drm/radeon/radeon_ttm.c
View File

@ -566,7 +566,8 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
struct page **pages = ttm->pages + pinned;
r = get_user_pages(userptr, num_pages, write, 0, pages, NULL);
r = get_user_pages(userptr, num_pages, write ? FOLL_WRITE : 0,
pages, NULL);
if (r < 0)
goto release_pages;

4
drivers/gpu/drm/via/via_dmablit.c
View File

@ -241,8 +241,8 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer)
down_read(&current->mm->mmap_sem);
ret = get_user_pages((unsigned long)xfer->mem_addr,
vsg->num_pages,
(vsg->direction == DMA_FROM_DEVICE),
0, vsg->pages, NULL);
(vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0,
vsg->pages, NULL);
up_read(&current->mm->mmap_sem);
if (ret != vsg->num_pages) {

6
drivers/infiniband/core/umem.c
View File

@ -94,6 +94,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
unsigned long dma_attrs = 0;
struct scatterlist *sg, *sg_list_start;
int need_release = 0;
unsigned int gup_flags = FOLL_WRITE;
if (dmasync)
dma_attrs |= DMA_ATTR_WRITE_BARRIER;
@ -183,6 +184,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
if (ret)
goto out;
if (!umem->writable)
gup_flags |= FOLL_FORCE;
need_release = 1;
sg_list_start = umem->sg_head.sgl;
@ -190,7 +194,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
ret = get_user_pages(cur_base,
min_t(unsigned long, npages,
PAGE_SIZE / sizeof (struct page *)),
1, !umem->writable, page_list, vma_list);
gup_flags, page_list, vma_list);
if (ret < 0)
goto out;

2
drivers/infiniband/hw/mthca/mthca_memfree.c
View File

@ -472,7 +472,7 @@ int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
goto out;
}
ret = get_user_pages(uaddr & PAGE_MASK, 1, 1, 0, pages, NULL);
ret = get_user_pages(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages, NULL);
if (ret < 0)
goto out;

3
drivers/infiniband/hw/qib/qib_user_pages.c
View File

@ -67,7 +67,8 @@ static int __qib_get_user_pages(unsigned long start_page, size_t num_pages,
for (got = 0; got < num_pages; got += ret) {
ret = get_user_pages(start_page + got * PAGE_SIZE,
num_pages - got, 1, 1,
num_pages - got,
FOLL_WRITE | FOLL_FORCE,
p + got, NULL);
if (ret < 0)
goto bail_release;

5
drivers/infiniband/hw/usnic/usnic_uiom.c
View File

@ -111,6 +111,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
int i;
int flags;
dma_addr_t pa;
unsigned int gup_flags;
if (!can_do_mlock())
return -EPERM;
@ -135,6 +136,8 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
flags = IOMMU_READ | IOMMU_CACHE;
flags |= (writable) ? IOMMU_WRITE : 0;
gup_flags = FOLL_WRITE;
gup_flags |= (writable) ? 0 : FOLL_FORCE;
cur_base = addr & PAGE_MASK;
ret = 0;
@ -142,7 +145,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
ret = get_user_pages(cur_base,
min_t(unsigned long, npages,
PAGE_SIZE / sizeof(struct page *)),
1, !writable, page_list, NULL);
gup_flags, page_list, NULL);
if (ret < 0)
goto out;

7
drivers/media/v4l2-core/videobuf-dma-sg.c
View File

@ -156,6 +156,7 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
{
unsigned long first, last;
int err, rw = 0;
unsigned int flags = FOLL_FORCE;
dma->direction = direction;
switch (dma->direction) {
@ -178,12 +179,14 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
if (NULL == dma->pages)
return -ENOMEM;
if (rw == READ)
flags |= FOLL_WRITE;
dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n",
data, size, dma->nr_pages);
err = get_user_pages(data & PAGE_MASK, dma->nr_pages,
rw == READ, 1, /* force */
dma->pages, NULL);
flags, dma->pages, NULL);
if (err != dma->nr_pages) {
dma->nr_pages = (err >= 0) ? err : 0;

3
drivers/misc/mic/scif/scif_rma.c
View File

@ -1396,8 +1396,7 @@ retry:
pinned_pages->nr_pages = get_user_pages(
(u64)addr,
nr_pages,
!!(prot & SCIF_PROT_WRITE),
0,
(prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0,
pinned_pages->pages,
NULL);
up_write(&mm->mmap_sem);

2
drivers/misc/sgi-gru/grufault.c
View File

@ -198,7 +198,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
#else
*pageshift = PAGE_SHIFT;
#endif
if (get_user_pages(vaddr, 1, write, 0, &page, NULL) <= 0)
if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0)
return -EFAULT;
*paddr = page_to_phys(page);
put_page(page);

3
drivers/platform/goldfish/goldfish_pipe.c
View File

@ -309,7 +309,8 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer,
* much memory to the process.
*/
down_read(&current->mm->mmap_sem);
ret = get_user_pages(address, 1, !is_write, 0, &page, NULL);
ret = get_user_pages(address, 1, is_write ? 0 : FOLL_WRITE,
&page, NULL);
up_read(&current->mm->mmap_sem);
if (ret < 0)
break;

3
drivers/rapidio/devices/rio_mport_cdev.c
View File

@ -892,7 +892,8 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode,
down_read(&current->mm->mmap_sem);
pinned = get_user_pages(
(unsigned long)xfer->loc_addr & PAGE_MASK,
nr_pages, dir == DMA_FROM_DEVICE, 0,
nr_pages,
dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
page_list, NULL);
up_read(&current->mm->mmap_sem);

3
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
View File

@ -423,8 +423,7 @@ create_pagelist(char __user *buf, size_t count, unsigned short type,
actual_pages = get_user_pages(task, task->mm,
(unsigned long)buf & ~(PAGE_SIZE - 1),
num_pages,
(type == PAGELIST_READ) /*Write */ ,
0 /*Force */ ,
(type == PAGELIST_READ) ? FOLL_WRITE : 0,
pages,
NULL /*vmas */);
up_read(&task->mm->mmap_sem);

3
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
View File

@ -1477,8 +1477,7 @@ dump_phys_mem(void *virt_addr, uint32_t num_bytes)
current->mm, /* mm */
(unsigned long)virt_addr, /* start */
num_pages, /* len */
0, /* write */
0, /* force */
0, /* gup_flags */
pages, /* pages (array of page pointers) */
NULL); /* vmas */
up_read(&current->mm->mmap_sem);

4
drivers/virt/fsl_hypervisor.c
View File

@ -245,8 +245,8 @@ static long ioctl_memcpy(struct fsl_hv_ioctl_memcpy __user *p)
/* Get the physical addresses of the source buffer */
down_read(&current->mm->mmap_sem);
num_pinned = get_user_pages(param.local_vaddr - lb_offset,
num_pages, (param.source == -1) ? READ : WRITE,
0, pages, NULL);
num_pages, (param.source == -1) ? 0 : FOLL_WRITE,
pages, NULL);
up_read(&current->mm->mmap_sem);
if (num_pinned != num_pages) {

2
include/linux/mm.h
View File

@ -1279,7 +1279,7 @@ long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
int write, int force, struct page **pages,
struct vm_area_struct **vmas);
long get_user_pages(unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas);
long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages, int *locked);

12
mm/gup.c
View File

@ -987,18 +987,12 @@ EXPORT_SYMBOL(get_user_pages_remote);
* obviously don't pass FOLL_REMOTE in here.
*/
long get_user_pages(unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas)
{
unsigned int flags = FOLL_TOUCH;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return __get_user_pages_locked(current, current->mm, start, nr_pages,
pages, vmas, NULL, false, flags);
pages, vmas, NULL, false,
gup_flags | FOLL_TOUCH);
}
EXPORT_SYMBOL(get_user_pages);

2
mm/mempolicy.c
View File

@ -850,7 +850,7 @@ static int lookup_node(unsigned long addr)
struct page *p;
int err;
err = get_user_pages(addr & PAGE_MASK, 1, 0, 0, &p, NULL);
err = get_user_pages(addr & PAGE_MASK, 1, 0, &p, NULL);
if (err >= 0) {
err = page_to_nid(p);
put_page(p);

18
mm/nommu.c
View File

@ -160,18 +160,11 @@ finish_or_fault:
* - don't permit access to VMAs that don't support it, such as I/O mappings
*/
long get_user_pages(unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
unsigned int gup_flags, struct page **pages,
struct vm_area_struct **vmas)
{
int flags = 0;
if (write)
flags |= FOLL_WRITE;
if (force)
flags |= FOLL_FORCE;
return __get_user_pages(current, current->mm, start, nr_pages, flags,
pages, vmas, NULL);
return __get_user_pages(current, current->mm, start, nr_pages,
gup_flags, pages, vmas, NULL);
}
EXPORT_SYMBOL(get_user_pages);
@ -179,10 +172,7 @@ long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
unsigned int gup_flags, struct page **pages,
int *locked)
{
int write = gup_flags & FOLL_WRITE;
int force = gup_flags & FOLL_FORCE;
return get_user_pages(start, nr_pages, write, force, pages, NULL);
return get_user_pages(start, nr_pages, gup_flags, pages, NULL);
}
EXPORT_SYMBOL(get_user_pages_locked);