On Thu, 30 Jun 2011 15:59:43 -0700 akpm@xxxxxxxxxxxxxxxxxxxx wrote: > The mm-of-the-moment snapshot 2011-06-30-15-59 has been uploaded to > > http://userweb.kernel.org/~akpm/mmotm/ > > and will soon be available at > git://zen-kernel.org/kernel/mmotm.git > or > git://git.cmpxchg.org/linux-mmotm.git > > It contains the following patches against 3.0-rc5: > == Because of x86-implement-strict-user-copy-checks-for-x86_64.patch At compling mm/mempolicy.c, following warning is shown. In file included from /home/kamezawa/Kernel/mmotm-0701/arch/x86/include/asm/uaccess.h:572, from include/linux/uaccess.h:5, from include/linux/highmem.h:7, from include/linux/pagemap.h:10, from include/linux/mempolicy.h:70, from mm/mempolicy.c:68: In function ?copy_from_user?, inlined from ?compat_sys_get_mempolicy? at mm/mempolicy.c:1415: .../mmotm-0701/arch/x86/include/asm/uaccess_64.h:64: warning: call to ?copy_from_user_overflow? declared with attribute warning: copy_from_user() buffer size is not provably correct LD mm/built-in.o Fix this by passing correct buffer size value. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> --- mm/mempolicy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) Index: mmotm-0701/mm/mempolicy.c =================================================================== --- mmotm-0701.orig/mm/mempolicy.c +++ mmotm-0701/mm/mempolicy.c @@ -1412,7 +1412,9 @@ asmlinkage long compat_sys_get_mempolicy err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); if (!err && nmask) { - err = copy_from_user(bm, nm, alloc_size); + unsigned long copy_size; + copy_size = min_t(unsigned long, sizeof(bm), alloc_size); + err = copy_from_user(bm, nm, copy_size); /* ensure entire bitmap is zeroed */ err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); err |= compat_put_bitmap(nmask, bm, nr_bits); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>