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linux-stable/fs/proc
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Aleksa Sarai 7e388d0f9c procfs: block chmod on /proc/thread-self/comm 
commit ccf61486fe upstream.

Due to an oversight in commit 1b3044e39a ("procfs: fix pthread
cross-thread naming if !PR_DUMPABLE") in switching from REG to NOD,
chmod operations on /proc/thread-self/comm were no longer blocked as
they are on almost all other procfs files.

A very similar situation with /proc/self/environ was used to as a root
exploit a long time ago, but procfs has SB_I_NOEXEC so this is simply a
correctness issue.

Ref: https://lwn.net/Articles/191954/
Ref: 6d76fa58b0 ("Don't allow chmod() on the /proc/<pid>/ files")
Fixes: 1b3044e39a ("procfs: fix pthread cross-thread naming if !PR_DUMPABLE")
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-Id: <20230713141001.27046-1-cyphar@cyphar.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2023-09-23 10:47:00 +02:00
..
Kconfig
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Makefile
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array.c fs/proc/array.c: allow reporting eip/esp for all coredumping threads 2019-07-03 13:15:59 +02:00
base.c procfs: block chmod on /proc/thread-self/comm 2023-09-23 10:47:00 +02:00
cmdline.c
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consoles.c
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cpuinfo.c
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devices.c
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fd.c
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fd.h
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generic.c
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inode.c proc: Use new_inode not new_inode_pseudo 2020-06-20 10:25:04 +02:00
internal.h
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interrupts.c
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kcore.c
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kmsg.c
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loadavg.c
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meminfo.c
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namespaces.c
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nommu.c
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page.c fs/proc/page.c: don't access uninitialized memmaps in fs/proc/page.c 2019-10-29 09:17:37 +01:00
proc_net.c
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proc_sysctl.c sysctl: add a new register_sysctl_init() interface 2023-02-06 07:46:33 +01:00
proc_tty.c
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root.c
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self.c proc: don't allow async path resolution of /proc/self components 2020-12-02 08:34:41 +01:00
softirqs.c
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stat.c
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task_mmu.c mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps 2023-02-22 12:46:03 +01:00
task_nommu.c
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thread_self.c proc: Use new_inode not new_inode_pseudo 2020-06-20 10:25:04 +02:00
uptime.c
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version.c
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vmcore.c proc/vmcore: fix clearing user buffer by properly using clear_user() 2021-12-08 08:46:52 +01:00