[PATCH 24/35] mm: Re-introduce vm_flags to do_mmap()
From: Rick Edgecombe <rick.p.edgecombe@intel.com>
Date: 2022-01-30 21:26:20
Also in:
linux-arch, linux-doc, linux-mm, lkml
Subsystem:
aio, filesystems (vfs and infrastructure), memory management, memory management - core, memory mapping, the rest · Maintainers:
Benjamin LaHaise, Alexander Viro, Christian Brauner, Andrew Morton, David Hildenbrand, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds
From: Yu-cheng Yu <redacted>
There was no more caller passing vm_flags to do_mmap(), and vm_flags was
removed from the function's input by:
commit 45e55300f114 ("mm: remove unnecessary wrapper function do_mmap_pgoff()").
There is a new user now. Shadow stack allocation passes VM_SHADOW_STACK to
do_mmap(). Thus, re-introduce vm_flags to do_mmap().
Signed-off-by: Yu-cheng Yu <redacted>
Reviewed-by: Peter Collingbourne <redacted>
Reviewed-by: Kees Cook <redacted>
Reviewed-by: Kirill A. Shutemov <redacted>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: linux-mm@kvack.org
---
fs/aio.c | 2 +-
include/linux/mm.h | 3 ++-
ipc/shm.c | 2 +-
mm/mmap.c | 10 +++++-----
mm/nommu.c | 4 ++--
mm/util.c | 2 +-
6 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index 4ceba13a7db0..a24618e0e3fc 100644
--- a/fs/aio.c
+++ b/fs/aio.c@@ -554,7 +554,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events) ctx->mmap_base = do_mmap(ctx->aio_ring_file, 0, ctx->mmap_size, PROT_READ | PROT_WRITE, - MAP_SHARED, 0, &unused, NULL); + MAP_SHARED, 0, 0, &unused, NULL); mmap_write_unlock(mm); if (IS_ERR((void *)ctx->mmap_base)) { ctx->mmap_size = 0;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e125358d7f75..481e1271409f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -2689,7 +2689,8 @@ extern unsigned long mmap_region(struct file *file, unsigned long addr, struct list_head *uf); extern unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, - unsigned long pgoff, unsigned long *populate, struct list_head *uf); + vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, + struct list_head *uf); extern int __do_munmap(struct mm_struct *, unsigned long, size_t, struct list_head *uf, bool downgrade); extern int do_munmap(struct mm_struct *, unsigned long, size_t,
diff --git a/ipc/shm.c b/ipc/shm.c
index b3048ebd5c31..f236b3e14ec4 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c@@ -1646,7 +1646,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, goto invalid; } - addr = do_mmap(file, addr, size, prot, flags, 0, &populate, NULL); + addr = do_mmap(file, addr, size, prot, flags, 0, 0, &populate, NULL); *raddr = addr; err = 0; if (IS_ERR_VALUE(addr))
diff --git a/mm/mmap.c b/mm/mmap.c
index 9bab326332af..9c82a1b02cfc 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c@@ -1410,11 +1410,11 @@ static inline bool file_mmap_ok(struct file *file, struct inode *inode, */ unsigned long do_mmap(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, - unsigned long flags, unsigned long pgoff, - unsigned long *populate, struct list_head *uf) + unsigned long flags, vm_flags_t vm_flags, + unsigned long pgoff, unsigned long *populate, + struct list_head *uf) { struct mm_struct *mm = current->mm; - vm_flags_t vm_flags; int pkey = 0; *populate = 0;
@@ -1474,7 +1474,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr, * to. we assume access permissions have been handled by the open * of the memory object, so we don't do any here. */ - vm_flags = calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) | + vm_flags |= calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) | mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; if (flags & MAP_LOCKED)
@@ -3011,7 +3011,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, file = get_file(vma->vm_file); ret = do_mmap(vma->vm_file, start, size, - prot, flags, pgoff, &populate, NULL); + prot, flags, 0, pgoff, &populate, NULL); fput(file); out: mmap_write_unlock(mm);
diff --git a/mm/nommu.c b/mm/nommu.c
index 55a9e48a7a02..a6e0243cd69b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c@@ -1057,6 +1057,7 @@ unsigned long do_mmap(struct file *file, unsigned long len, unsigned long prot, unsigned long flags, + vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, struct list_head *uf)
@@ -1064,7 +1065,6 @@ unsigned long do_mmap(struct file *file, struct vm_area_struct *vma; struct vm_region *region; struct rb_node *rb; - vm_flags_t vm_flags; unsigned long capabilities, result; int ret;
@@ -1083,7 +1083,7 @@ unsigned long do_mmap(struct file *file, /* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ - vm_flags = determine_vm_flags(file, prot, flags, capabilities); + vm_flags |= determine_vm_flags(file, prot, flags, capabilities); /* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL);
diff --git a/mm/util.c b/mm/util.c
index 7e43369064c8..d419821364cc 100644
--- a/mm/util.c
+++ b/mm/util.c@@ -516,7 +516,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr, if (!ret) { if (mmap_write_lock_killable(mm)) return -EINTR; - ret = do_mmap(file, addr, len, prot, flag, pgoff, &populate, + ret = do_mmap(file, addr, len, prot, flag, 0, pgoff, &populate, &uf); mmap_write_unlock(mm); userfaultfd_unmap_complete(mm, &uf);
--
2.17.1