From 09a9f1d27892255cfb9c91203f19476765e2d8d1 Mon Sep 17 00:00:00 2001 From: Michel Lespinasse Date: Thu, 28 Mar 2013 16:26:23 -0700 Subject: [PATCH] Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs" This reverts commit 186930500985 ("mm: introduce VM_POPULATE flag to better deal with racy userspace programs"). VM_POPULATE only has any effect when userspace plays racy games with vmas by trying to unmap and remap memory regions that mmap or mlock are operating on. Also, the only effect of VM_POPULATE when userspace plays such games is that it avoids populating new memory regions that get remapped into the address range that was being operated on by the original mmap or mlock calls. Let's remove VM_POPULATE as there isn't any strong argument to mandate a new vm_flag. Signed-off-by: Michel Lespinasse Signed-off-by: Hugh Dickins Signed-off-by: Linus Torvalds --- include/linux/mm.h | 1 - include/linux/mman.h | 4 +--- mm/fremap.c | 12 ++---------- mm/mlock.c | 11 +++++------ mm/mmap.c | 4 +++- 5 files changed, 11 insertions(+), 21 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 7acc9dc73c9f..e19ff30ad0a2 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -87,7 +87,6 @@ extern unsigned int kobjsize(const void *objp); #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ -#define VM_POPULATE 0x00001000 #define VM_LOCKED 0x00002000 #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ diff --git a/include/linux/mman.h b/include/linux/mman.h index 61c7a87e5d2b..9aa863da287f 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -79,8 +79,6 @@ calc_vm_flag_bits(unsigned long flags) { return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | - ((flags & MAP_LOCKED) ? (VM_LOCKED | VM_POPULATE) : 0) | - (((flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE) ? - VM_POPULATE : 0); + _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); } #endif /* _LINUX_MMAN_H */ diff --git a/mm/fremap.c b/mm/fremap.c index 4723ac8d2fc2..87da3590c61e 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -204,10 +204,8 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, unsigned long addr; struct file *file = get_file(vma->vm_file); - vm_flags = vma->vm_flags; - if (!(flags & MAP_NONBLOCK)) - vm_flags |= VM_POPULATE; - addr = mmap_region(file, start, size, vm_flags, pgoff); + addr = mmap_region(file, start, size, + vma->vm_flags, pgoff); fput(file); if (IS_ERR_VALUE(addr)) { err = addr; @@ -226,12 +224,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, mutex_unlock(&mapping->i_mmap_mutex); } - if (!(flags & MAP_NONBLOCK) && !(vma->vm_flags & VM_POPULATE)) { - if (!has_write_lock) - goto get_write_lock; - vma->vm_flags |= VM_POPULATE; - } - if (vma->vm_flags & VM_LOCKED) { /* * drop PG_Mlocked flag for over-mapped range diff --git a/mm/mlock.c b/mm/mlock.c index 1c5e33fce639..79b7cf7d1bca 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -358,7 +358,7 @@ static int do_mlock(unsigned long start, size_t len, int on) newflags = vma->vm_flags & ~VM_LOCKED; if (on) - newflags |= VM_LOCKED | VM_POPULATE; + newflags |= VM_LOCKED; tmp = vma->vm_end; if (tmp > end) @@ -418,8 +418,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) * range with the first VMA. Also, skip undesirable VMA types. */ nend = min(end, vma->vm_end); - if ((vma->vm_flags & (VM_IO | VM_PFNMAP | VM_POPULATE)) != - VM_POPULATE) + if (vma->vm_flags & (VM_IO | VM_PFNMAP)) continue; if (nstart < vma->vm_start) nstart = vma->vm_start; @@ -492,9 +491,9 @@ static int do_mlockall(int flags) struct vm_area_struct * vma, * prev = NULL; if (flags & MCL_FUTURE) - current->mm->def_flags |= VM_LOCKED | VM_POPULATE; + current->mm->def_flags |= VM_LOCKED; else - current->mm->def_flags &= ~(VM_LOCKED | VM_POPULATE); + current->mm->def_flags &= ~VM_LOCKED; if (flags == MCL_FUTURE) goto out; @@ -503,7 +502,7 @@ static int do_mlockall(int flags) newflags = vma->vm_flags & ~VM_LOCKED; if (flags & MCL_CURRENT) - newflags |= VM_LOCKED | VM_POPULATE; + newflags |= VM_LOCKED; /* Ignore errors */ mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags); diff --git a/mm/mmap.c b/mm/mmap.c index 2664a47cec93..6466699b16cb 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1306,7 +1306,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, } addr = mmap_region(file, addr, len, vm_flags, pgoff); - if (!IS_ERR_VALUE(addr) && (vm_flags & VM_POPULATE)) + if (!IS_ERR_VALUE(addr) && + ((vm_flags & VM_LOCKED) || + (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE)) *populate = len; return addr; } -- GitLab