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-rw-r--r--security/Kconfig12
-rw-r--r--security/commoncap.c2
2 files changed, 14 insertions, 0 deletions
diff --git a/security/Kconfig b/security/Kconfig
index bd72ae62349..e80da955e68 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -39,6 +39,18 @@ config KEYS_DEBUG_PROC_KEYS
If you are unsure as to whether this is required, answer N.
+config SECURITY_DMESG_RESTRICT
+ bool "Restrict unprivileged access to the kernel syslog"
+ default n
+ help
+ This enforces restrictions on unprivileged users reading the kernel
+ syslog via dmesg(8).
+
+ If this option is not selected, no restrictions will be enforced
+ unless the dmesg_restrict sysctl is explicitly set to (1).
+
+ If you are unsure how to answer this question, answer N.
+
config SECURITY
bool "Enable different security models"
depends on SYSFS
diff --git a/security/commoncap.c b/security/commoncap.c
index 5e632b4857e..04b80f9912b 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -895,6 +895,8 @@ int cap_syslog(int type, bool from_file)
{
if (type != SYSLOG_ACTION_OPEN && from_file)
return 0;
+ if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
if ((type != SYSLOG_ACTION_READ_ALL &&
type != SYSLOG_ACTION_SIZE_BUFFER) && !capable(CAP_SYS_ADMIN))
return -EPERM;