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1991a8f693
linux/fs/proc
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Alexey Gladkov 1991a8f693 proc: prevent reconfiguring subset=pid 
Changing subset=pid on an existing procfs instance is not safe. If a
full procfs mount has entries hidden by overmounts, switching it to
subset=pid would hide the top-level procfs entries from lookup and
readdir while leaving the existing overmounts reachable.

Reject attempts to change the subset=pid state during reconfigure before
applying any other procfs mount options, so a failed reconfigure cannot
partially update the instance.

Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://patch.msgid.link/13295f40f642af5d6e7038d681d43132ad80f7b2.1777278334.git.legion@kernel.org
Reviewed-by: Aleksa Sarai <aleksa@amutable.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2026-05-11 23:13:02 +02:00
..
array.c proc: array: drop stale FIXME about RCU in task_sig() 2026-03-27 21:19:32 -07:00
base.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
bootconfig.c fs/proc: Skip bootloader comment if no embedded kernel parameters 2024-04-09 23:36:18 +09:00
cmdline.c proc: mark /proc/cmdline as permanent 2023-02-02 22:50:02 -08:00
consoles.c proc: Add nbcon support for /proc/consoles 2024-09-04 15:56:33 +02:00
cpuinfo.c
devices.c proc: mark more files as permanent 2022-10-03 14:21:45 -07:00
fd.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
fd.h fs: port ->permission() to pass mnt_idmap 2023-01-19 09:24:28 +01:00
generic.c proc: allow to mark /proc files permanent outside of fs/proc/ 2026-05-11 23:13:01 +02:00
inode.c fs/proc: replace "__auto_type" with "const auto" 2025-12-08 15:32:15 -08:00
internal.h proc: allow to mark /proc files permanent outside of fs/proc/ 2026-05-11 23:13:01 +02:00
interrupts.c fs/procfs: Switch to irq_get_nr_irqs() 2024-10-16 21:56:59 +02:00
Kconfig virtio-mem: support CONFIG_PROC_VMCORE_DEVICE_RAM 2025-01-27 09:39:25 -05:00
kcore.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
kmsg.c printk changes for 6.1 2022-10-10 11:24:19 -07:00
loadavg.c proc: mark more files as permanent 2022-10-03 14:21:45 -07:00
Makefile kbuild: make -Woverride-init warnings more consistent 2024-03-31 11:32:26 +09:00
meminfo.c mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
namespaces.c proc: rename proc_setattr to proc_nochmod_setattr 2026-03-26 15:16:54 +01:00
nommu.c fs: create helper file_user_path() for user displayed mapped file path 2023-10-19 11:03:15 +02:00
page.c fs/proc/page: remove unused KPMBITS 2025-11-20 14:03:42 -08:00
proc_net.c proc: subset=pid: Show /proc/self/net only for CAP_NET_ADMIN 2026-05-11 23:13:01 +02:00
proc_sysctl.c Current exclusion rules for ->d_flags stores are rather unpleasant. 2025-07-28 09:17:57 -07:00
proc_tty.c proc: delete unused <linux/uaccess.h> includes 2022-07-17 17:31:39 -07:00
root.c proc: prevent reconfiguring subset=pid 2026-05-11 23:13:02 +02:00
self.c fs/proc: Don't lock root inode when creating "self" and "thread-self" 2026-03-06 10:24:11 +01:00
softirqs.c proc/softirqs: replace seq_printf with seq_put_decimal_ull_width 2024-11-07 07:40:14 -10:00
stat.c fs/procfs: Switch to irq_get_nr_irqs() 2024-10-16 21:56:59 +02:00
task_mmu.c treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
task_nommu.c fs/proc/task_mmu: factor out proc_maps_private fields used by PROCMAP_QUERY 2025-09-13 16:54:48 -07:00
thread_self.c fs/proc: Don't lock root inode when creating "self" and "thread-self" 2026-03-06 10:24:11 +01:00
uptime.c proc: mark more files as permanent 2022-10-03 14:21:45 -07:00
util.c
version.c proc: mark more files as permanent 2022-10-03 14:21:45 -07:00
vmcore.c mm: rename my_zero_pfn() to zero_pfn() 2026-04-05 13:53:01 -07:00