Date: Wednesday, January 20, 2016 @ 07:14:00 Author: tpowa Revision: 258431
fix #47820 CVE-2016-0728 Added: linux/repos/core-i686/CVE-2016-0728.patch Modified: linux/repos/core-i686/PKGBUILD ---------------------+ CVE-2016-0728.patch | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++ PKGBUILD | 6 +++ 2 files changed, 83 insertions(+), 1 deletion(-) Added: CVE-2016-0728.patch =================================================================== --- CVE-2016-0728.patch (rev 0) +++ CVE-2016-0728.patch 2016-01-20 06:14:00 UTC (rev 258431) @@ -0,0 +1,78 @@ +From 23567fd052a9abb6d67fe8e7a9ccdd9800a540f2 Mon Sep 17 00:00:00 2001 +From: Yevgeny Pats <yevg...@perception-point.io> +Date: Tue, 19 Jan 2016 22:09:04 +0000 +Subject: [PATCH] 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 <yevg...@perception-point.io> +Signed-off-by: David Howells <dhowe...@redhat.com> +Acked-by: Don Zickus <dzic...@redhat.com> +Acked-by: Prarit Bhargava <pra...@redhat.com> +Acked-by: Jarod Wilson <ja...@redhat.com> +Signed-off-by: James Morris <james.l.mor...@oracle.com> +--- + 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 a3f85d2a..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; + } Modified: PKGBUILD =================================================================== --- PKGBUILD 2016-01-20 06:12:11 UTC (rev 258430) +++ PKGBUILD 2016-01-20 06:14:00 UTC (rev 258431) @@ -21,7 +21,8 @@ 'config' 'config.x86_64' # standard config files for mkinitcpio ramdisk 'linux.preset' - 'change-default-console-loglevel.patch') + 'change-default-console-loglevel.patch' + 'CVE-2016-0728.patch') sha256sums=('4a622cc84b8a3c38d39bc17195b0c064d2b46945dfde0dae18f77b120bc9f3ae' 'SKIP' @@ -48,6 +49,9 @@ # add latest fixes from stable queue, if needed # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git + # fixes #47820 CVE-2016-0728.patch + patch -Np1 -i "${srcdir}/CVE-2016-0728.patch" + # set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param) # remove this when a Kconfig knob is made available by upstream # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)