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| author | Paul Mundt <lethal@linux-sh.org> | 2010-05-20 11:57:38 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-05-20 11:57:38 +0900 |
| commit | ffee72d4681c8777918268a96aef42bdeb6c367b (patch) | |
| tree | 4baf91483886d561c198ed0524ab54b783273e86 /mm/util.c | |
| parent | fb54d268329846aa13b2bc44a64d90e9b7131192 (diff) | |
| parent | f72caf7e496465182eeda842ac66a5e75404ddf1 (diff) | |
| download | kernel_goldelico_gta04-ffee72d4681c8777918268a96aef42bdeb6c367b.zip kernel_goldelico_gta04-ffee72d4681c8777918268a96aef42bdeb6c367b.tar.gz kernel_goldelico_gta04-ffee72d4681c8777918268a96aef42bdeb6c367b.tar.bz2 | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -186,6 +186,27 @@ void kzfree(const void *p) } EXPORT_SYMBOL(kzfree); +int kern_ptr_validate(const void *ptr, unsigned long size) +{ + unsigned long addr = (unsigned long)ptr; + unsigned long min_addr = PAGE_OFFSET; + unsigned long align_mask = sizeof(void *) - 1; + + if (unlikely(addr < min_addr)) + goto out; + if (unlikely(addr > (unsigned long)high_memory - size)) + goto out; + if (unlikely(addr & align_mask)) + goto out; + if (unlikely(!kern_addr_valid(addr))) + goto out; + if (unlikely(!kern_addr_valid(addr + size - 1))) + goto out; + return 1; +out: + return 0; +} + /* * strndup_user - duplicate an existing string from user space * @s: The string to duplicate |