Alexey Dobriyan 9ea03f6890 proc: fix lookup in /proc/net subdirectories after setns(2) ...

[ Upstream commit c6c75deda81344c3a95d1d1f606d5cee109e5d54 ]

Commit 1fde6f21d90f ("proc: fix /proc/net/* after setns(2)") only forced
revalidation of regular files under /proc/net/

However, /proc/net/ is unusual in the sense of /proc/net/foo handlers
take netns pointer from parent directory which is old netns.

Steps to reproduce:

	(void)open("/proc/net/sctp/snmp", O_RDONLY);
	unshare(CLONE_NEWNET);

	int fd = open("/proc/net/sctp/snmp", O_RDONLY);
	read(fd, &c, 1);

Read will read wrong data from original netns.

Patch forces lookup on every directory under /proc/net .

Link: https://lkml.kernel.org/r/20201205160916.GA109739@localhost.localdomain
Fixes: 1da4d377f943 ("proc: revalidate misc dentries")
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reported-by: "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@nokia.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-01-12 20:16:10 +01:00

..

array.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-07-08 16:39:53 -07:00

base.c

exec: Transform exec_update_mutex into a rw_semaphore

2021-01-09 13:44:55 +01:00

cmdline.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

consoles.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 191

2019-05-30 11:29:21 -07:00

cpuinfo.c

x86 / CPU: Always show current CPU frequency in /proc/cpuinfo

2017-11-15 19:46:50 +01:00

devices.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

fd.c

proc: use "unsigned int" in proc_fill_cache()

2018-06-07 17:34:38 -07:00

fd.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

generic.c

proc: fix lookup in /proc/net subdirectories after setns(2)

2021-01-12 20:16:10 +01:00

inode.c

proc: Use new_inode not new_inode_pseudo

2020-06-17 16:40:33 +02:00

internal.h

proc: fix lookup in /proc/net subdirectories after setns(2)

2021-01-12 20:16:10 +01:00

interrupts.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

Kconfig

Merge branch 'akpm' (patches from Andrew)

2019-07-17 08:58:04 -07:00

kcore.c

lockdown: Print current->comm in restriction messages

2019-08-19 21:54:17 -07:00

kmsg.c

vfs: do bulk POLL* -> EPOLL* replacement

2018-02-11 14:34:03 -08:00

loadavg.c

sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD

2018-10-26 16:26:32 -07:00

Makefile

proc: : uninline name_to_int()

2017-11-17 16:10:00 -08:00

meminfo.c

proc/meminfo: fix output alignment

2019-10-19 06:32:32 -04:00

namespaces.c

procfs: switch instantiate_t to d_splice_alias()

2018-05-26 14:20:50 -04:00

nommu.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30 11:26:32 -07:00

page.c

fs/proc/page.c: don't access uninitialized memmaps in fs/proc/page.c

2019-10-19 06:32:31 -04:00

proc_net.c

proc: fix lookup in /proc/net subdirectories after setns(2)

2021-01-12 20:16:10 +01:00

proc_sysctl.c

proc/sysctl: add shared variables for range check

2019-07-18 17:08:07 -07:00

proc_tty.c

tty: replace ->proc_fops with ->proc_show

2018-05-16 07:24:30 +02:00

root.c

new helper: get_tree_keyed()

2019-09-05 14:34:22 -04:00

self.c

proc: don't allow async path resolution of /proc/self components

2020-12-02 08:49:48 +01:00

softirqs.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

stat.c

Merge branch 'akpm' (patches from Andrew)

2019-03-06 10:31:36 -08:00

task_mmu.c

proc: use untagged_addr() for pagemap_read addresses

2020-12-16 10:56:58 +01:00

task_nommu.c

proc: use down_read_killable mmap_sem for /proc/pid/maps

2019-07-12 11:05:46 -07:00

thread_self.c

proc: Use new_inode not new_inode_pseudo

2020-06-17 16:40:33 +02:00

uptime.c

fs/proc/uptime.c: use ktime_get_boottime_ts64

2018-08-22 10:52:45 -07:00

util.c

fs/proc/util.c: include fs/proc/internal.h for name_to_int()

2019-01-04 13:13:45 -08:00

version.c

proc: introduce proc_create_single{,_data}

2018-05-16 07:23:35 +02:00

vmcore.c

vmalloc: fix remap_vmalloc_range() bounds checks

2020-04-29 16:33:14 +02:00