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Groups > linux.kernel > #1514618 > unrolled thread
| Started by | Lafcadio Wluiki <wluikil@gmail.com> |
|---|---|
| First post | 2016-11-03 16:40 +0100 |
| Last post | 2016-11-03 17:00 +0100 |
| Articles | 2 — 2 participants |
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[PATCH 1/2] procfs: use an enum for possible hidepid values Lafcadio Wluiki <wluikil@gmail.com> - 2016-11-03 16:40 +0100
Re: [PATCH 1/2] procfs: use an enum for possible hidepid values Kees Cook <keescook@chromium.org> - 2016-11-03 17:00 +0100
| From | Lafcadio Wluiki <wluikil@gmail.com> |
|---|---|
| Date | 2016-11-03 16:40 +0100 |
| Subject | [PATCH 1/2] procfs: use an enum for possible hidepid values |
| Message-ID | <szshs-5Fc-15@gated-at.bofh.it> |
(Third, rebased submission, since first two submissions yielded no replies.)
Previously, the hidepid parameter was checked by comparing literal
integers 0, 1, 2. Let's add a proper enum for this, to make the checking
more expressive:
0 → HIDEPID_OFF
1 → HIDEPID_NO_ACCESS
2 → HIDEPID_INVISIBLE
This changes the internal labelling only, the userspace-facing interface
remains unmodified, and still works with literal integers 0, 1, 2.
No functional changes.
Signed-off-by: Lafcadio Wluiki <wluikil@gmail.com>
---
fs/proc/base.c | 8 ++++----
fs/proc/inode.c | 2 +-
fs/proc/root.c | 3 ++-
include/linux/pid_namespace.h | 6 ++++++
4 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ca651ac..ae5e13c 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -726,11 +726,11 @@ static int proc_pid_permission(struct inode *inode, int mask)
task = get_proc_task(inode);
if (!task)
return -ESRCH;
- has_perms = has_pid_permissions(pid, task, 1);
+ has_perms = has_pid_permissions(pid, task, HIDEPID_NO_ACCESS);
put_task_struct(task);
if (!has_perms) {
- if (pid->hide_pid == 2) {
+ if (pid->hide_pid == HIDEPID_INVISIBLE) {
/*
* Let's make getdents(), stat(), and open()
* consistent with each other. If a process
@@ -1720,7 +1720,7 @@ int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
stat->gid = GLOBAL_ROOT_GID;
task = pid_task(proc_pid(inode), PIDTYPE_PID);
if (task) {
- if (!has_pid_permissions(pid, task, 2)) {
+ if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) {
rcu_read_unlock();
/*
* This doesn't prevent learning whether PID exists,
@@ -3181,7 +3181,7 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
iter.tgid += 1, iter = next_tgid(ns, iter)) {
char name[PROC_NUMBUF];
int len;
- if (!has_pid_permissions(ns, iter.task, 2))
+ if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE))
continue;
len = snprintf(name, sizeof(name), "%d", iter.tgid);
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index e69ebe6..872325e 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -106,7 +106,7 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root)
if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID))
seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid));
- if (pid->hide_pid != 0)
+ if (pid->hide_pid != HIDEPID_OFF)
seq_printf(seq, ",hidepid=%u", pid->hide_pid);
return 0;
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 8d3e484..2989731 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -58,7 +58,8 @@ int proc_parse_options(char *options, struct pid_namespace *pid)
case Opt_hidepid:
if (match_int(&args[0], &option))
return 0;
- if (option < 0 || option > 2) {
+ if (option < HIDEPID_OFF ||
+ option > HIDEPID_INVISIBLE) {
pr_err("proc: hidepid value must be between 0 and 2.\n");
return 0;
}
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 34cce96..c2a989d 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -21,6 +21,12 @@ struct pidmap {
struct fs_pin;
+enum { /* definitions for pid_namespace's hide_pid field */
+ HIDEPID_OFF = 0,
+ HIDEPID_NO_ACCESS = 1,
+ HIDEPID_INVISIBLE = 2,
+};
+
struct pid_namespace {
struct kref kref;
struct pidmap pidmap[PIDMAP_ENTRIES];
--
2.7.4
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| From | Kees Cook <keescook@chromium.org> |
|---|---|
| Date | 2016-11-03 17:00 +0100 |
| Message-ID | <szsAO-5Mg-31@gated-at.bofh.it> |
| In reply to | #1514618 |
On Thu, Nov 3, 2016 at 9:30 AM, Lafcadio Wluiki <wluikil@gmail.com> wrote:
> (Third, rebased submission, since first two submissions yielded no replies.)
Hm, I didn't see this series before, for some reason.
> Previously, the hidepid parameter was checked by comparing literal
> integers 0, 1, 2. Let's add a proper enum for this, to make the checking
> more expressive:
>
> 0 → HIDEPID_OFF
> 1 → HIDEPID_NO_ACCESS
> 2 → HIDEPID_INVISIBLE
>
> This changes the internal labelling only, the userspace-facing interface
> remains unmodified, and still works with literal integers 0, 1, 2.
>
> No functional changes.
>
> Signed-off-by: Lafcadio Wluiki <wluikil@gmail.com>
Yup, this is good. Dropping literals is always preferred. :)
Acked-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> fs/proc/base.c | 8 ++++----
> fs/proc/inode.c | 2 +-
> fs/proc/root.c | 3 ++-
> include/linux/pid_namespace.h | 6 ++++++
> 4 files changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index ca651ac..ae5e13c 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -726,11 +726,11 @@ static int proc_pid_permission(struct inode *inode, int mask)
> task = get_proc_task(inode);
> if (!task)
> return -ESRCH;
> - has_perms = has_pid_permissions(pid, task, 1);
> + has_perms = has_pid_permissions(pid, task, HIDEPID_NO_ACCESS);
> put_task_struct(task);
>
> if (!has_perms) {
> - if (pid->hide_pid == 2) {
> + if (pid->hide_pid == HIDEPID_INVISIBLE) {
> /*
> * Let's make getdents(), stat(), and open()
> * consistent with each other. If a process
> @@ -1720,7 +1720,7 @@ int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
> stat->gid = GLOBAL_ROOT_GID;
> task = pid_task(proc_pid(inode), PIDTYPE_PID);
> if (task) {
> - if (!has_pid_permissions(pid, task, 2)) {
> + if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) {
> rcu_read_unlock();
> /*
> * This doesn't prevent learning whether PID exists,
> @@ -3181,7 +3181,7 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
> iter.tgid += 1, iter = next_tgid(ns, iter)) {
> char name[PROC_NUMBUF];
> int len;
> - if (!has_pid_permissions(ns, iter.task, 2))
> + if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE))
> continue;
>
> len = snprintf(name, sizeof(name), "%d", iter.tgid);
> diff --git a/fs/proc/inode.c b/fs/proc/inode.c
> index e69ebe6..872325e 100644
> --- a/fs/proc/inode.c
> +++ b/fs/proc/inode.c
> @@ -106,7 +106,7 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root)
>
> if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID))
> seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid));
> - if (pid->hide_pid != 0)
> + if (pid->hide_pid != HIDEPID_OFF)
> seq_printf(seq, ",hidepid=%u", pid->hide_pid);
>
> return 0;
> diff --git a/fs/proc/root.c b/fs/proc/root.c
> index 8d3e484..2989731 100644
> --- a/fs/proc/root.c
> +++ b/fs/proc/root.c
> @@ -58,7 +58,8 @@ int proc_parse_options(char *options, struct pid_namespace *pid)
> case Opt_hidepid:
> if (match_int(&args[0], &option))
> return 0;
> - if (option < 0 || option > 2) {
> + if (option < HIDEPID_OFF ||
> + option > HIDEPID_INVISIBLE) {
> pr_err("proc: hidepid value must be between 0 and 2.\n");
> return 0;
> }
> diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
> index 34cce96..c2a989d 100644
> --- a/include/linux/pid_namespace.h
> +++ b/include/linux/pid_namespace.h
> @@ -21,6 +21,12 @@ struct pidmap {
>
> struct fs_pin;
>
> +enum { /* definitions for pid_namespace's hide_pid field */
> + HIDEPID_OFF = 0,
> + HIDEPID_NO_ACCESS = 1,
> + HIDEPID_INVISIBLE = 2,
> +};
> +
> struct pid_namespace {
> struct kref kref;
> struct pidmap pidmap[PIDMAP_ENTRIES];
> --
> 2.7.4
>
--
Kees Cook
Nexus Security
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