* [PATCH] proc: Make /proc/<pid>/io world readable
@ 2019-11-21 21:09 Daniel Xu
2019-11-21 21:25 ` Daniel Xu
0 siblings, 1 reply; 2+ messages in thread
From: Daniel Xu @ 2019-11-21 21:09 UTC (permalink / raw)
To: adobriyan, christian, akpm, tglx, mhocko, keescook, shakeelb,
casey, khlebnikov, kent.overstreet, linux-kernel, linux-fsdevel
Cc: Daniel Xu, dschatzberg, htejun, dennis, kernel-team
/proc/<pid>/io is currently only owner readable. This forces monitoring
programs (such as atop) to run with elevated permissions to collect disk
stats. Changing this file to world readable can add a measure of safety to
userspace.
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
fs/proc/base.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ebea9501afb8..1d1c1d680e16 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3076,7 +3076,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
- ONE("io", S_IRUSR, proc_tgid_io_accounting),
+ ONE("io", S_IRUGO, proc_tgid_io_accounting),
#endif
#ifdef CONFIG_USER_NS
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
@@ -3473,7 +3473,7 @@ static const struct pid_entry tid_base_stuff[] = {
REG("fail-nth", 0644, proc_fail_nth_operations),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
- ONE("io", S_IRUSR, proc_tid_io_accounting),
+ ONE("io", S_IRUGO, proc_tid_io_accounting),
#endif
#ifdef CONFIG_USER_NS
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
--
2.21.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] proc: Make /proc/<pid>/io world readable
2019-11-21 21:09 [PATCH] proc: Make /proc/<pid>/io world readable Daniel Xu
@ 2019-11-21 21:25 ` Daniel Xu
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Xu @ 2019-11-21 21:25 UTC (permalink / raw)
To: adobriyan, christian, akpm, tglx, mhocko, keescook, shakeelb,
casey, khlebnikov, kent.overstreet, linux-kernel, linux-fsdevel
Cc: dschatzberg, htejun, dennis, Kernel Team
On Thu, Nov 21, 2019, at 1:09 PM, Daniel Xu wrote:
> /proc/<pid>/io is currently only owner readable. This forces monitoring
> programs (such as atop) to run with elevated permissions to collect disk
> stats. Changing this file to world readable can add a measure of safety to
> userspace.
>
> Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
> ---
> fs/proc/base.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index ebea9501afb8..1d1c1d680e16 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -3076,7 +3076,7 @@ static const struct pid_entry tgid_base_stuff[] = {
> REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
> #endif
> #ifdef CONFIG_TASK_IO_ACCOUNTING
> - ONE("io", S_IRUSR, proc_tgid_io_accounting),
> + ONE("io", S_IRUGO, proc_tgid_io_accounting),
> #endif
> #ifdef CONFIG_USER_NS
> REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
> @@ -3473,7 +3473,7 @@ static const struct pid_entry tid_base_stuff[] = {
> REG("fail-nth", 0644, proc_fail_nth_operations),
> #endif
> #ifdef CONFIG_TASK_IO_ACCOUNTING
> - ONE("io", S_IRUSR, proc_tid_io_accounting),
> + ONE("io", S_IRUGO, proc_tid_io_accounting),
> #endif
> #ifdef CONFIG_USER_NS
> REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
> --
> 2.21.0
>
>
Nevermind, abandoning. Just found 1d1221f375c94ef961b ("proc: restrict access to /proc/PID/io").
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