commit: 5976cc60315452fcf49adda2f52e5ff8c966e831 Author: Mike Pagano <mpagano <AT> gentoo <DOT> org> AuthorDate: Wed Jan 20 14:35:20 2016 +0000 Commit: Mike Pagano <mpagano <AT> gentoo <DOT> org> CommitDate: Wed Jan 20 14:35:20 2016 +0000 URL: https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=5976cc60
Ensure that thread joining a session keyring does not leak the keyring reference. CVE-2016-0728. 0000_README | 4 ++ ...ing-refleak-in-join-session-CVE-2016-0728.patch | 81 ++++++++++++++++++++++ 2 files changed, 85 insertions(+) diff --git a/0000_README b/0000_README index 369ed3d..3fe5eec 100644 --- a/0000_README +++ b/0000_README @@ -151,6 +151,10 @@ Patch: 1510_fs-enable-link-security-restrictions-by-default.patch From: http://sources.debian.net/src/linux/3.16.7-ckt4-3/debian/patches/debian/fs-enable-link-security-restrictions-by-default.patch/ Desc: Enable link security restrictions by default +Patch: 1520_keyring-refleak-in-join-session-CVE-2016-0728.patch +From: https://bugs.gentoo.org/show_bug.cgi?id=572384 +Desc: Ensure that thread joining a session keyring does not leak the keyring reference. CVE-2016-0728. + Patch: 1700_ARM-dts-patch-to-support-popoplug-e02.patch From: https://bugs.gentoo.org/show_bug.cgi?id=508248 Desc: ARM: dts: Add support for Pogoplug E02. diff --git a/1520_keyring-refleak-in-join-session-CVE-2016-0728.patch b/1520_keyring-refleak-in-join-session-CVE-2016-0728.patch new file mode 100644 index 0000000..49020d7 --- /dev/null +++ b/1520_keyring-refleak-in-join-session-CVE-2016-0728.patch @@ -0,0 +1,81 @@ +From 23567fd052a9abb6d67fe8e7a9ccdd9800a540f2 Mon Sep 17 00:00:00 2001 +From: Yevgeny Pats <[email protected]> +Date: Tue, 19 Jan 2016 22:09:04 +0000 +Subject: KEYS: Fix keyring ref leak in join_session_keyring() + +This fixes CVE-2016-0728. + +If a thread is asked to join as a session keyring the keyring that's already +set as its session, we leak a keyring reference. + +This can be tested with the following program: + + #include <stddef.h> + #include <stdio.h> + #include <sys/types.h> + #include <keyutils.h> + + int main(int argc, const char *argv[]) + { + int i = 0; + key_serial_t serial; + + serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING, + "leaked-keyring"); + if (serial < 0) { + perror("keyctl"); + return -1; + } + + if (keyctl(KEYCTL_SETPERM, serial, + KEY_POS_ALL | KEY_USR_ALL) < 0) { + perror("keyctl"); + return -1; + } + + for (i = 0; i < 100; i++) { + serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING, + "leaked-keyring"); + if (serial < 0) { + perror("keyctl"); + return -1; + } + } + + return 0; + } + +If, after the program has run, there something like the following line in +/proc/keys: + +3f3d898f I--Q--- 100 perm 3f3f0000 0 0 keyring leaked-keyring: empty + +with a usage count of 100 * the number of times the program has been run, +then the kernel is malfunctioning. If leaked-keyring has zero usages or +has been garbage collected, then the problem is fixed. + +Reported-by: Yevgeny Pats <[email protected]> +Signed-off-by: David Howells <[email protected]> +Acked-by: Don Zickus <[email protected]> +Acked-by: Prarit Bhargava <[email protected]> +Acked-by: Jarod Wilson <[email protected]> +Signed-off-by: James Morris <[email protected]> +--- + security/keys/process_keys.c | 1 + + 1 file changed, 1 insertion(+) + +diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c +index a3f85d2..e6d50172 100644 +--- a/security/keys/process_keys.c ++++ b/security/keys/process_keys.c +@@ -794,6 +794,7 @@ long join_session_keyring(const char *name) + ret = PTR_ERR(keyring); + goto error2; + } else if (keyring == new->session_keyring) { ++ key_put(keyring); + ret = 0; + goto error2; + } +-- +cgit v0.12 +
