]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
netfilter: xt_IDLETIMER: add sysfs filename checking routine
authorTaehee Yoo <ap420073@gmail.com>
Sat, 20 Oct 2018 15:00:08 +0000 (00:00 +0900)
committerPablo Neira Ayuso <pablo@netfilter.org>
Sat, 3 Nov 2018 12:28:01 +0000 (13:28 +0100)
commit54451f60c8fa061af9051a53be9786393947367c
treef3cda53f6b4f0a5d7bd082db8b78828faabb244d
parent17b8b74c0f8dbf9b9e3301f9ca5b65dd1c079951
netfilter: xt_IDLETIMER: add sysfs filename checking routine

When IDLETIMER rule is added, sysfs file is created under
/sys/class/xt_idletimer/timers/
But some label name shouldn't be used.
".", "..", "power", "uevent", "subsystem", etc...
So that sysfs filename checking routine is needed.

test commands:
   %iptables -I INPUT -j IDLETIMER --timeout 1 --label "power"

splat looks like:
[95765.423132] sysfs: cannot create duplicate filename '/devices/virtual/xt_idletimer/timers/power'
[95765.433418] CPU: 0 PID: 8446 Comm: iptables Not tainted 4.19.0-rc6+ #20
[95765.449755] Call Trace:
[95765.449755]  dump_stack+0xc9/0x16b
[95765.449755]  ? show_regs_print_info+0x5/0x5
[95765.449755]  sysfs_warn_dup+0x74/0x90
[95765.449755]  sysfs_add_file_mode_ns+0x352/0x500
[95765.449755]  sysfs_create_file_ns+0x179/0x270
[95765.449755]  ? sysfs_add_file_mode_ns+0x500/0x500
[95765.449755]  ? idletimer_tg_checkentry+0x3e5/0xb1b [xt_IDLETIMER]
[95765.449755]  ? rcu_read_lock_sched_held+0x114/0x130
[95765.449755]  ? __kmalloc_track_caller+0x211/0x2b0
[95765.449755]  ? memcpy+0x34/0x50
[95765.449755]  idletimer_tg_checkentry+0x4e2/0xb1b [xt_IDLETIMER]
[ ... ]

Fixes: 0902b469bd25 ("netfilter: xtables: idletimer target implementation")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
net/netfilter/xt_IDLETIMER.c