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 <jsl...@suse.cz> >> Cc: Jeff Layton <jlay...@poochiereds.net> >> Cc: "J. Bruce Fields" <bfie...@fieldses.org> >> Cc: Alexander Viro <v...@zeniv.linux.org.uk> >> Cc: linux-fsde...@vger.kernel.org >> --- >> 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, -- js suse labs
