On Tue, 2008-11-04 at 17:43 +0100, Bastian Blank wrote:
> On Tue, Nov 04, 2008 at 02:26:33PM +0000, Ian Campbell wrote:
> > On Tue, 2008-11-04 at 14:02 +0100, Bastian Blank wrote:
> > > Maybe its the best to remove the workaround and instead cripple mprotect
> > > to not allow PROT_NONE for now. And then hope that this can't be
> > > triggered by mmap with PROT_NONE.
> > I was thinking of going down the path of removing the workaround then
> > fixing mprotect, so your suggestion would be a consistant first step I
> > think.
>
> Unchecked patch attached. It disallows changes from and to PROT_NONE.
It boots but I cannot login, it hangs after MOTD.
I added some debug and I see an aweful lot of transitions to prot ==
0x0, seemingly for every process... I think this login has hung although
I don't get a debug message from it:
43.350538] login S ffffffff8037fea0 0 1087 1
[ 43.350538] ffff880007de7b78 0000000000000286 ffff880007de7ab0 0000000000000000
[ 43.350538] ffff880007d1b810 ffffffff803d4460 ffff880007d1ba48 0000000007802b50
[ 43.350538] 00000000000480fd ffffffff80292c42 0000000000000000 00000000000480fd
[ 43.350538] Call Trace:
[ 43.350538] [<ffffffff80292c42>] __find_get_block_slow+0xec/0xf8
[ 43.350538] [<ffffffff802c8d73>] do_get_write_access+0x39e/0x3e9
[ 43.350538] [<ffffffff8036b28a>] schedule_timeout+0x1e/0xad
[ 43.350538] [<ffffffff80293036>] __getblk+0x1d/0x230
[ 43.350538] [<ffffffff8023c5e4>] prepare_to_wait_exclusive+0x15/0x5e
[ 43.350538] [<ffffffff803628aa>] unix_wait_for_peer+0xb0/0xcc
[ 43.350538] [<ffffffff8023c521>] autoremove_wake_function+0x0/0x2e
[ 43.350538] [<ffffffff80320631>] memcpy_fromiovec+0x36/0x66
[ 43.350538] [<ffffffff80362e65>] unix_dgram_sendmsg+0x3b7/0x4e4
[ 43.350538] [<ffffffff8031995d>] sock_sendmsg+0xcb/0xe3
[ 43.350538] [<ffffffff8023c521>] autoremove_wake_function+0x0/0x2e
[ 43.350538] [<ffffffff802877c1>] mntput_no_expire+0x20/0x15d
[ 43.350538] [<ffffffff803629d8>] unix_find_other+0x112/0x1e8
[ 43.350538] [<ffffffff8027bd4a>] do_path_lookup+0x14c/0x170
[ 43.350538] [<ffffffff802877c1>] mntput_no_expire+0x20/0x15d
[ 43.350538] [<ffffffff80319241>] sockfd_lookup_light+0x1a/0x52
[ 43.350538] [<ffffffff80319cf2>] sys_sendto+0xf3/0x127
[ 43.350538] [<ffffffff803645df>] unix_dgram_connect+0x14d/0x182
[ 43.350538] [<ffffffff80319464>] sys_connect+0x6c/0x9c
[ 43.350538] [<ffffffff8020b4d8>] system_call+0x68/0x6d
[ 43.350538] [<ffffffff8020b470>] system_call+0x0/0x6d
Ian.
--
Ian Campbell
True to our past we work with an inherited, observed, and accepted vision of
personal futility, and of the beauty of the world.
-- David Mamet
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