[PATCH] proc: advertise new restrictions on /proc/*/maps &/proc/*/smaps

[Guillaume Chazarain]

Now that strangers are kept out of /proc/<pid>/maps, let's welcome them
with -EPERM instead of a blank file.

Signed-off-by: Guillaume Chazarain <guichaz@xxxxxxxx>
---

 fs/proc/base.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)


diff --git a/fs/proc/base.c b/fs/proc/base.c
index 7411bfb..c824b23 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2207,7 +2207,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 	INF("cmdline",    S_IRUGO, pid_cmdline),
 	INF("stat",       S_IRUGO, tgid_stat),
 	INF("statm",      S_IRUGO, pid_statm),
-	REG("maps",       S_IRUGO, maps),
+	REG("maps",       S_IRUSR, maps),
 #ifdef CONFIG_NUMA
 	REG("numa_maps",  S_IRUGO, numa_maps),
 #endif
@@ -2219,7 +2219,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 	REG("mountstats", S_IRUSR, mountstats),
 #ifdef CONFIG_MMU
 	REG("clear_refs", S_IWUSR, clear_refs),
-	REG("smaps",      S_IRUGO, smaps),
+	REG("smaps",      S_IRUSR, smaps),
 #endif
 #ifdef CONFIG_SECURITY
 	DIR("attr",       S_IRUGO|S_IXUGO, attr_dir),
@@ -2533,7 +2533,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	INF("cmdline",   S_IRUGO, pid_cmdline),
 	INF("stat",      S_IRUGO, tid_stat),
 	INF("statm",     S_IRUGO, pid_statm),
-	REG("maps",      S_IRUGO, maps),
+	REG("maps",      S_IRUSR, maps),
 #ifdef CONFIG_NUMA
 	REG("numa_maps", S_IRUGO, numa_maps),
 #endif
@@ -2544,7 +2544,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("mounts",    S_IRUGO, mounts),
 #ifdef CONFIG_MMU
 	REG("clear_refs", S_IWUSR, clear_refs),
-	REG("smaps",     S_IRUGO, smaps),
+	REG("smaps",     S_IRUSR, smaps),
 #endif
 #ifdef CONFIG_SECURITY
 	DIR("attr",      S_IRUGO|S_IXUGO, attr_dir),

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