From beed3af565fd6eb2eab45a1b970be8d8cd8437d5 Mon Sep 17 00:00:00 2001 From: Mark H Weaver Date: Wed, 20 Jan 2016 13:04:35 -0500 Subject: gnu: linux-libre: Add fix for CVE-2016-0728. * gnu/packages/patches/linux-libre-CVE-2016-0728.patch: New file. * gnu-system.am (dist_patch_DATA): Add it. * gnu/packages/linux.scm (linux-libre)[source]: Add patch. --- .../patches/linux-libre-CVE-2016-0728.patch | 84 ++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 gnu/packages/patches/linux-libre-CVE-2016-0728.patch (limited to 'gnu/packages/patches/linux-libre-CVE-2016-0728.patch') diff --git a/gnu/packages/patches/linux-libre-CVE-2016-0728.patch b/gnu/packages/patches/linux-libre-CVE-2016-0728.patch new file mode 100644 index 0000000000..254d6c1aea --- /dev/null +++ b/gnu/packages/patches/linux-libre-CVE-2016-0728.patch @@ -0,0 +1,84 @@ +Copied from +https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=23567fd052a9abb6d67fe8e7a9ccdd9800a540f2 + +From 23567fd052a9abb6d67fe8e7a9ccdd9800a540f2 Mon Sep 17 00:00:00 2001 +From: Yevgeny Pats +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 + #include + #include + #include + + 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 +Signed-off-by: David Howells +Acked-by: Don Zickus +Acked-by: Prarit Bhargava +Acked-by: Jarod Wilson +Signed-off-by: James Morris +--- + 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 + -- cgit 1.4.1