Will Deacon 50192abe02 fs/9p: avoid accessing utsname after namespace has been torn down ... During trinity fuzzing in a kvmtool guest, I stumbled across the following: Unable to handle kernel NULL pointer dereference at virtual address 00000004 PC is at v9fs_file_do_lock+0xc8/0x1a0 LR is at v9fs_file_do_lock+0x48/0x1a0 [<c01e2ed0>] (v9fs_file_do_lock+0xc8/0x1a0) from [<c0119154>] (locks_remove_flock+0x8c/0x124) [<c0119154>] (locks_remove_flock+0x8c/0x124) from [<c00d9bf0>] (__fput+0x58/0x1e4) [<c00d9bf0>] (__fput+0x58/0x1e4) from [<c0044340>] (task_work_run+0xac/0xe8) [<c0044340>] (task_work_run+0xac/0xe8) from [<c002e36c>] (do_exit+0x6bc/0x8d8) [<c002e36c>] (do_exit+0x6bc/0x8d8) from [<c002e674>] (do_group_exit+0x3c/0xb0) [<c002e674>] (do_group_exit+0x3c/0xb0) from [<c002e6f8>] (__wake_up_parent+0x0/0x18) I believe this is due to an attempt to access utsname()->nodename, after exit_task_namespaces() has been called, leaving current->nsproxy->uts_ns as NULL and causing the above dereference. A similar issue was fixed for lockd in 9a1b6bf818 ("LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs"), so this patch attempts something similar for 9pfs. Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>		2013-08-26 10:28:46 -05:00
..
client.c	fs/9p: avoid accessing utsname after namespace has been torn down	2013-08-26 10:28:46 -05:00
error.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
Kconfig	net/9p: remove depends on CONFIG_EXPERIMENTAL	2013-01-11 11:39:33 -08:00
Makefile
mod.c
protocol.c	9p: Modify the stat structures to use kuid_t and kgid_t	2013-02-12 03:19:31 -08:00
protocol.h
trans_common.c	9p: fix off by one causing access violations and memory corruption	2013-07-11 11:36:02 -07:00
trans_common.h
trans_fd.c	net/9p: add privport option to 9p tcp transport	2013-07-07 21:59:54 -05:00
trans_rdma.c	9P: Add cancelled() to the transport functions.	2013-07-07 22:18:18 -05:00
trans_virtio.c	9p: send uevent after adding/removing mount_tag attribute	2013-08-26 10:28:22 -05:00
util.c	net/9p: convert to idr_alloc()	2013-02-27 19:10:20 -08:00