diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-01-14 11:39:39 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-18 10:19:11 -0800 |
| commit | 1f51eb3a881359e97dc2c228e55c83fba598e349 (patch) | |
| tree | d408fd227f329d2df0007b7677d27b64375b1ccb /mm/mmap.c | |
| parent | c3a8e0eaafb438d5a7e6ca55c09b921291fcc1b1 (diff) | |
untangle the do_mremap() mess
This backports the following upstream commits all as one patch:
54f5de709984bae0d31d823ff03de755f9dcac54
ecc1a8993751de4e82eb18640d631dae1f626bd6
1a0ef85f84feb13f07b604fcf5b90ef7c2b5c82f
f106af4e90eadd76cfc0b5325f659619e08fb762
097eed103862f9c6a97f2e415e21d1134017b135
935874141df839c706cd6cdc438e85eb69d1525e
0ec62d290912bb4b989be7563851bc364ec73b56
c4caa778157dbbf04116f0ac2111e389b5cd7a29
2ea1d13f64efdf49319e86c87d9ba38c30902782
570dcf2c15463842e384eb597a87c1e39bead99b
564b3bffc619dcbdd160de597b0547a7017ea010
0067bd8a55862ac9dd212bd1c4f6f5bff1ca1301
f8b7256096a20436f6d0926747e3ac3d64c81d24
8c7b49b3ecd48923eb64ff57e07a1cdb74782970
9206de95b1ea68357996ec02be5db0638a0de2c1
2c6a10161d0b5fc047b5bd81b03693b9af99fab5
05d72faa6d13c9d857478a5d35c85db9adada685
bb52d6694002b9d632bb355f64daa045c6293a4e
e77414e0aad6a1b063ba5e5750c582c75327ea6a
aa65607373a4daf2010e8c3867b6317619f3c1a3
Backport done by Greg Kroah-Hartman. Only minor tweaks were needed.
Cc: David S. Miller <davem@davemloft.net>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 42 |
1 files changed, 11 insertions, 31 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 73f5e4b64010..ae197468b352 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -932,13 +932,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, if (!(flags & MAP_FIXED)) addr = round_hint_to_min(addr); - error = arch_mmap_check(addr, len, flags); - if (error) - return error; - /* Careful about overflows.. */ len = PAGE_ALIGN(len); - if (!len || len > TASK_SIZE) + if (!len) return -ENOMEM; /* offset overflow? */ @@ -949,24 +945,6 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, if (mm->map_count > sysctl_max_map_count) return -ENOMEM; - if (flags & MAP_HUGETLB) { - struct user_struct *user = NULL; - if (file) - return -EINVAL; - - /* - * VM_NORESERVE is used because the reservations will be - * taken when vm_ops->mmap() is called - * A dummy user value is used because we are not locking - * memory so no accounting is necessary - */ - len = ALIGN(len, huge_page_size(&default_hstate)); - file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE, - &user, HUGETLB_ANONHUGE_INODE); - if (IS_ERR(file)) - return PTR_ERR(file); - } - /* Obtain the address to map to. we verify (or select) it and ensure * that it represents a valid section of the address space. */ @@ -1459,6 +1437,14 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); + unsigned long error = arch_mmap_check(addr, len, flags); + if (error) + return error; + + /* Careful about overflows.. */ + if (len > TASK_SIZE) + return -ENOMEM; + get_area = current->mm->get_unmapped_area; if (file && file->f_op && file->f_op->get_unmapped_area) get_area = file->f_op->get_unmapped_area; @@ -2003,20 +1989,14 @@ unsigned long do_brk(unsigned long addr, unsigned long len) if (!len) return addr; - if ((addr + len) > TASK_SIZE || (addr + len) < addr) - return -EINVAL; - - if (is_hugepage_only_range(mm, addr, len)) - return -EINVAL; - error = security_file_mmap(NULL, 0, 0, 0, addr, 1); if (error) return error; flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags; - error = arch_mmap_check(addr, len, flags); - if (error) + error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED); + if (error & ~PAGE_MASK) return error; /* |