[PATCH 20/24] Lock down /proc/kcore
From: David Howells <dhowells@redhat.com>
Date: 2018-04-11 16:26:53
Also in:
linux-man, linux-security-module, lkml
Subsystem:
filesystems (vfs and infrastructure), kcore, proc filesystem, the rest · Maintainers:
Alexander Viro, Christian Brauner, Omar Sandoval, Linus Torvalds
Disallow access to /proc/kcore when the kernel is locked down to prevent access to cryptographic data. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: James Morris <redacted> --- fs/proc/kcore.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index d1e82761de81..cdebdee81719 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c@@ -546,6 +546,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) static int open_kcore(struct inode *inode, struct file *filp) { + if (kernel_is_locked_down("/proc/kcore")) + return -EPERM; if (!capable(CAP_SYS_RAWIO)) return -EPERM;