On 2017/6/13 17:29, Jiri Slaby wrote: > On 06/12/2017, 07:03 AM, zhong jiang wrote: >> On 2016/10/14 17:23, Jiri Slaby wrote: >>> fcntl(0, F_SETOWN, 0x80000000) triggers: >>> UBSAN: Undefined behaviour in fs/fcntl.c:118:7 >>> negation of -2147483648 cannot be represented in type 'int': >>> CPU: 1 PID: 18261 Comm: syz-executor Not tainted 4.8.1-0-syzkaller #1 >>> ... >>> Call Trace: >>> ... >>> [<ffffffffad8f0868>] ? f_setown+0x1d8/0x200 >>> [<ffffffffad8f19a9>] ? SyS_fcntl+0x999/0xf30 >>> [<ffffffffaed1fb00>] ? entry_SYSCALL_64_fastpath+0x23/0xc1 >>> >>> Fix that by checking the arg parameter properly (against INT_MAX) and >>> return immediatelly in case it is wrong. No error is returned, the >>> same as in other cases. >>> >>> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> >>> Cc: Jeff Layton <jlayton@xxxxxxxxxxxxxxx> >>> Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx> >>> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx> >>> Cc: linux-fsdevel@xxxxxxxxxxxxxxx >>> --- >>> fs/fcntl.c | 4 ++++ >>> 1 file changed, 4 insertions(+) >>> >>> diff --git a/fs/fcntl.c b/fs/fcntl.c >>> index 350a2c8cfd28..bfc3b040d956 100644 >>> --- a/fs/fcntl.c >>> +++ b/fs/fcntl.c >>> @@ -112,6 +112,10 @@ void f_setown(struct file *filp, unsigned long arg, int force) >>> enum pid_type type; >>> struct pid *pid; >>> int who = arg; >>> + >>> + if (arg > INT_MAX) >>> + return; >>> + >>> type = PIDTYPE_PID; >>> if (who < 0 >>> type = PIDTYPE_PGID; >> Hi, Jiri >> >> I hit the same issue, but I see the upstream is still not changed. Had any problem? > Hi, it needed an update which I have just sent. So let's see if that > gets applied. > > thanks, I have updated in newest kernel version. but it fails to get the change. Can you look at that? Thanks zhongjiang
