diff options
| -rw-r--r-- | arch/sparc/include/asm/uaccess_64.h | 2 | ||||
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 2 | ||||
| -rw-r--r-- | fs/proc/task_mmu.c | 9 | ||||
| -rw-r--r-- | include/linux/mm.h | 11 | ||||
| -rw-r--r-- | include/linux/uaccess.h | 22 | ||||
| -rw-r--r-- | mm/gup.c | 4 | ||||
| -rw-r--r-- | mm/madvise.c | 5 | ||||
| -rw-r--r-- | mm/migrate.c | 11 |
8 files changed, 43 insertions, 23 deletions
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 94266a5c5b04..b825a5dd0210 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -8,8 +8,10 @@ #include <linux/compiler.h> #include <linux/string.h> +#include <linux/mm_types.h> #include <asm/asi.h> #include <asm/spitfire.h> +#include <asm/pgtable.h> #include <asm/processor.h> #include <asm-generic/access_ok.h> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 493c31de0edb..3d4dd9420c30 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -580,7 +580,7 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr, goto done; } - vaddr = untagged_addr(vaddr); + vaddr = untagged_addr_remote(mm, vaddr); retry: vma = vma_lookup(mm, vaddr); diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 6a96e1713fd5..29fd6b1f4058 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1689,8 +1689,13 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, /* watch out for wraparound */ start_vaddr = end_vaddr; - if (svpfn <= (ULONG_MAX >> PAGE_SHIFT)) - start_vaddr = untagged_addr(svpfn << PAGE_SHIFT); + if (svpfn <= (ULONG_MAX >> PAGE_SHIFT)) { + ret = mmap_read_lock_killable(mm); + if (ret) + goto out_free; + start_vaddr = untagged_addr_remote(mm, svpfn << PAGE_SHIFT); + mmap_read_unlock(mm); + } /* Ensure the address is inside the task */ if (start_vaddr > mm->task_size) diff --git a/include/linux/mm.h b/include/linux/mm.h index 1f79667824eb..289ae4caf878 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -96,17 +96,6 @@ extern int mmap_rnd_compat_bits __read_mostly; #include <asm/page.h> #include <asm/processor.h> -/* - * Architectures that support memory tagging (assigning tags to memory regions, - * embedding these tags into addresses that point to these memory regions, and - * checking that the memory and the pointer tags match on memory accesses) - * redefine this macro to strip tags from pointers. - * It's defined as noop for architectures that don't support memory tagging. - */ -#ifndef untagged_addr -#define untagged_addr(addr) (addr) -#endif - #ifndef __pa_symbol #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #endif diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index ab9728138ad6..3064314f4832 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -11,6 +11,28 @@ #include <asm/uaccess.h> /* + * Architectures that support memory tagging (assigning tags to memory regions, + * embedding these tags into addresses that point to these memory regions, and + * checking that the memory and the pointer tags match on memory accesses) + * redefine this macro to strip tags from pointers. + * + * Passing down mm_struct allows to define untagging rules on per-process + * basis. + * + * It's defined as noop for architectures that don't support memory tagging. + */ +#ifndef untagged_addr +#define untagged_addr(addr) (addr) +#endif + +#ifndef untagged_addr_remote +#define untagged_addr_remote(mm, addr) ({ \ + mmap_assert_locked(mm); \ + untagged_addr(addr); \ +}) +#endif + +/* * Architectures should provide two primitives (raw_copy_{to,from}_user()) * and get rid of their private instances of copy_{to,from}_user() and * __copy_{to,from}_user{,_inatomic}(). @@ -1085,7 +1085,7 @@ static long __get_user_pages(struct mm_struct *mm, if (!nr_pages) return 0; - start = untagged_addr(start); + start = untagged_addr_remote(mm, start); VM_BUG_ON(!!pages != !!(gup_flags & (FOLL_GET | FOLL_PIN))); @@ -1259,7 +1259,7 @@ int fixup_user_fault(struct mm_struct *mm, struct vm_area_struct *vma; vm_fault_t ret; - address = untagged_addr(address); + address = untagged_addr_remote(mm, address); if (unlocked) fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; diff --git a/mm/madvise.c b/mm/madvise.c index 340125d08c03..d4b67f36f70f 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -1402,8 +1402,6 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh size_t len; struct blk_plug plug; - start = untagged_addr(start); - if (!madvise_behavior_valid(behavior)) return -EINVAL; @@ -1435,6 +1433,9 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh mmap_read_lock(mm); } + start = untagged_addr_remote(mm, start); + end = start + len; + blk_start_plug(&plug); error = madvise_walk_vmas(mm, start, end, behavior, madvise_vma_behavior); diff --git a/mm/migrate.c b/mm/migrate.c index 98f1c11197a8..8cd11bc9208f 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2097,15 +2097,18 @@ static int do_move_pages_to_node(struct mm_struct *mm, * target node * 1 - when it has been queued */ -static int add_page_for_migration(struct mm_struct *mm, unsigned long addr, +static int add_page_for_migration(struct mm_struct *mm, const void __user *p, int node, struct list_head *pagelist, bool migrate_all) { struct vm_area_struct *vma; + unsigned long addr; struct page *page; int err; bool isolated; mmap_read_lock(mm); + addr = (unsigned long)untagged_addr_remote(mm, p); + err = -EFAULT; vma = vma_lookup(mm, addr); if (!vma || !vma_migratable(vma)) @@ -2211,7 +2214,6 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, for (i = start = 0; i < nr_pages; i++) { const void __user *p; - unsigned long addr; int node; err = -EFAULT; @@ -2219,7 +2221,6 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, goto out_flush; if (get_user(node, nodes + i)) goto out_flush; - addr = (unsigned long)untagged_addr(p); err = -ENODEV; if (node < 0 || node >= MAX_NUMNODES) @@ -2247,8 +2248,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, * Errors in the page lookup or isolation are not fatal and we simply * report them via status */ - err = add_page_for_migration(mm, addr, current_node, - &pagelist, flags & MPOL_MF_MOVE_ALL); + err = add_page_for_migration(mm, p, current_node, &pagelist, + flags & MPOL_MF_MOVE_ALL); if (err > 0) { /* The page is successfully queued for migration */ |