[kernel/f20] More keys fixes from upstream to fix keyctl_get_persisent crash (rhbz 1043033)

Josh Boyer jwboyer at fedoraproject.org
Fri Dec 13 21:45:17 UTC 2013


commit 3176b53d381525d58d48363fca4e774c2a2d90c0
Author: Josh Boyer <jwboyer at fedoraproject.org>
Date:   Fri Dec 13 16:45:15 2013 -0500

    More keys fixes from upstream to fix keyctl_get_persisent crash (rhbz 1043033)

 kernel.spec      |    5 +-
 keys-fixes.patch |  171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 175 insertions(+), 1 deletions(-)
---
diff --git a/kernel.spec b/kernel.spec
index cac37d7..df96e1d 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -62,7 +62,7 @@ Summary: The Linux kernel
 # For non-released -rc kernels, this will be appended after the rcX and
 # gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
 #
-%global baserelease 300
+%global baserelease 301
 %global fedora_build %{baserelease}
 
 # base_sublevel is the kernel version we're starting with and patching
@@ -2275,6 +2275,9 @@ fi
 #                 ||----w |
 #                 ||     ||
 %changelog
+* Fri Dec 13 2013 Josh Boyer <jwboyer at fedoraproject.org>
+- More keys fixes from upstream to fix keyctl_get_persisent crash (rhbz 1043033)
+
 * Fri Dec 13 2013 Justin M. Forbes <jforbes at fedoraproject.org - 3.12.5-300
 - Linux v3.12.5 rebase
 
diff --git a/keys-fixes.patch b/keys-fixes.patch
index 96c9822..35a689f 100644
--- a/keys-fixes.patch
+++ b/keys-fixes.patch
@@ -1023,3 +1023,174 @@ index 7f44c32..8137b27 100644
 -- 
 1.8.3.1
 
+From d7ec435fdd03cfee70dba934ee384acc87bd6d00 Mon Sep 17 00:00:00 2001
+From: David Howells <dhowells at redhat.com>
+Date: Fri, 13 Dec 2013 15:20:19 +0000
+Subject: [PATCH 1/3] X.509: Fix certificate gathering
+
+Fix the gathering of certificates from both the source tree and the build tree
+to correctly calculate the pathnames of all the certificates.
+
+The problem was that if the default generated cert, signing_key.x509, didn't
+exist then it would not have a path attached and if it did, it would have a
+path attached.
+
+This means that the contents of kernel/.x509.list would change between the
+first compilation in a directory and the second.  After the second it would
+remain stable because the signing_key.x509 file exists.
+
+The consequence was that the kernel would get relinked unconditionally on the
+second recompilation.  The second recompilation would also show something like
+this:
+
+   X.509 certificate list changed
+     CERTS   kernel/x509_certificate_list
+     - Including cert /home/torvalds/v2.6/linux/signing_key.x509
+     AS      kernel/system_certificates.o
+     LD      kernel/built-in.o
+
+which is why the relink would happen.
+
+
+Unfortunately, it isn't a simple matter of just sticking a path on the front
+of the filename of the certificate in the build directory as make can't then
+work out how to build it.
+
+So the path has to be prepended to the name for sorting and duplicate
+elimination and then removed for the make rule if it is in the build tree.
+
+Reported-by: Linus Torvalds <torvalds at linux-foundation.org>
+Signed-off-by: David Howells <dhowells at redhat.com>
+---
+ kernel/Makefile | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/kernel/Makefile b/kernel/Makefile
+index bbaf7d5..c23bb0b 100644
+--- a/kernel/Makefile
++++ b/kernel/Makefile
+@@ -137,9 +137,10 @@ $(obj)/timeconst.h: $(obj)/hz.bc $(src)/timeconst.bc FORCE
+ ###############################################################################
+ ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
+ X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
+-X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
+-X509_CERTIFICATES := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
++X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
++X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
+ 				$(or $(realpath $(CERT)),$(CERT))))
++X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
+ 
+ ifeq ($(X509_CERTIFICATES),)
+ $(warning *** No X.509 certificates found ***)
+-- 
+1.8.3.1
+
+
+From f46a3cbbebdaa5ca7b3ab23d7b81925dbe152bcb Mon Sep 17 00:00:00 2001
+From: Kirill Tkhai <tkhai at yandex.ru>
+Date: Tue, 10 Dec 2013 22:39:57 +0400
+Subject: [PATCH 2/3] KEYS: Remove files generated when
+ SYSTEM_TRUSTED_KEYRING=y
+
+Always remove generated SYSTEM_TRUSTED_KEYRING files while doing make mrproper.
+
+Signed-off-by: Kirill Tkhai <tkhai at yandex.ru>
+Signed-off-by: David Howells <dhowells at redhat.com>
+---
+ kernel/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/kernel/Makefile b/kernel/Makefile
+index c23bb0b..bc010ee 100644
+--- a/kernel/Makefile
++++ b/kernel/Makefile
+@@ -165,9 +165,9 @@ $(obj)/x509_certificate_list: $(X509_CERTIFICATES) $(obj)/.x509.list
+ targets += $(obj)/.x509.list
+ $(obj)/.x509.list:
+ 	@echo $(X509_CERTIFICATES) >$@
++endif
+ 
+ clean-files := x509_certificate_list .x509.list
+-endif
+ 
+ ifeq ($(CONFIG_MODULE_SIG),y)
+ ###############################################################################
+-- 
+1.8.3.1
+
+
+From 6bd364d82920be726c2d678e7ba9e27112686e11 Mon Sep 17 00:00:00 2001
+From: Xiao Guangrong <xiaoguangrong at linux.vnet.ibm.com>
+Date: Fri, 13 Dec 2013 15:00:32 +0800
+Subject: [PATCH 3/3] KEYS: fix uninitialized persistent_keyring_register_sem
+
+We run into this bug:
+[ 2736.063245] Unable to handle kernel paging request for data at address 0x00000000
+[ 2736.063293] Faulting instruction address: 0xc00000000037efb0
+[ 2736.063300] Oops: Kernel access of bad area, sig: 11 [#1]
+[ 2736.063303] SMP NR_CPUS=2048 NUMA pSeries
+[ 2736.063310] Modules linked in: sg nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_mangle ip6table_security ip6table_raw ip6t_REJECT iptable_nat nf_nat_ipv4 iptable_mangle iptable_security iptable_raw ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ebtable_filter ebtables ip6table_filter iptable_filter ip_tables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 nf_nat nf_conntrack ip6_tables ibmveth pseries_rng nx_crypto nfsd auth_rpcgss nfs_acl lockd sunrpc binfmt_misc xfs libcrc32c dm_service_time sd_mod crc_t10dif crct10dif_common ibmvfc scsi_transport_fc scsi_tgt dm_mirror dm_region_hash dm_log dm_multipath dm_mod
+[ 2736.063383] CPU: 1 PID: 7128 Comm: ssh Not tainted 3.10.0-48.el7.ppc64 #1
+[ 2736.063389] task: c000000131930120 ti: c0000001319a0000 task.ti: c0000001319a0000
+[ 2736.063394] NIP: c00000000037efb0 LR: c0000000006c40f8 CTR: 0000000000000000
+[ 2736.063399] REGS: c0000001319a3870 TRAP: 0300   Not tainted  (3.10.0-48.el7.ppc64)
+[ 2736.063403] MSR: 8000000000009032 <SF,EE,ME,IR,DR,RI>  CR: 28824242  XER: 20000000
+[ 2736.063415] SOFTE: 0
+[ 2736.063418] CFAR: c00000000000908c
+[ 2736.063421] DAR: 0000000000000000, DSISR: 40000000
+[ 2736.063425]
+GPR00: c0000000006c40f8 c0000001319a3af0 c000000001074788 c0000001319a3bf0
+GPR04: 0000000000000000 0000000000000000 0000000000000020 000000000000000a
+GPR08: fffffffe00000002 00000000ffff0000 0000000080000001 c000000000924888
+GPR12: 0000000028824248 c000000007e00400 00001fffffa0f998 0000000000000000
+GPR16: 0000000000000022 00001fffffa0f998 0000010022e92470 0000000000000000
+GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
+GPR24: 0000000000000000 c000000000f4a828 00003ffffe527108 0000000000000000
+GPR28: c000000000f4a730 c000000000f4a828 0000000000000000 c0000001319a3bf0
+[ 2736.063498] NIP [c00000000037efb0] .__list_add+0x30/0x110
+[ 2736.063504] LR [c0000000006c40f8] .rwsem_down_write_failed+0x78/0x264
+[ 2736.063508] PACATMSCRATCH [800000000280f032]
+[ 2736.063511] Call Trace:
+[ 2736.063516] [c0000001319a3af0] [c0000001319a3b80] 0xc0000001319a3b80 (unreliable)
+[ 2736.063523] [c0000001319a3b80] [c0000000006c40f8] .rwsem_down_write_failed+0x78/0x264
+[ 2736.063530] [c0000001319a3c50] [c0000000006c1bb0] .down_write+0x70/0x78
+[ 2736.063536] [c0000001319a3cd0] [c0000000002e5ffc] .keyctl_get_persistent+0x20c/0x320
+[ 2736.063542] [c0000001319a3dc0] [c0000000002e2388] .SyS_keyctl+0x238/0x260
+[ 2736.063548] [c0000001319a3e30] [c000000000009e7c] syscall_exit+0x0/0x7c
+[ 2736.063553] Instruction dump:
+[ 2736.063556] 7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 7cbd2b78 7c9e2378 7c7f1b78 f8010010
+[ 2736.063566] f821ff71 e8a50008 7fa52040 40de00c0 <e8be0000> 7fbd2840 40de0094 7fbff040
+[ 2736.063579] ---[ end trace 2708241785538296 ]---
+
+It's caused by uninitialized persistent_keyring_register_sem.
+
+The bug was introduced by commit f36f8c75, two typos are in that commit:
+CONFIG_KEYS_KERBEROS_CACHE should be CONFIG_PERSISTENT_KEYRINGS and
+krb_cache_register_sem should be persistent_keyring_register_sem.
+
+Signed-off-by: Xiao Guangrong <xiaoguangrong at linux.vnet.ibm.com>
+Signed-off-by: David Howells <dhowells at redhat.com>
+---
+ kernel/user.c | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/kernel/user.c b/kernel/user.c
+index a3a0dbf..c006131 100644
+--- a/kernel/user.c
++++ b/kernel/user.c
+@@ -51,9 +51,9 @@ struct user_namespace init_user_ns = {
+ 	.owner = GLOBAL_ROOT_UID,
+ 	.group = GLOBAL_ROOT_GID,
+ 	.proc_inum = PROC_USER_INIT_INO,
+-#ifdef CONFIG_KEYS_KERBEROS_CACHE
+-	.krb_cache_register_sem =
+-	__RWSEM_INITIALIZER(init_user_ns.krb_cache_register_sem),
++#ifdef CONFIG_PERSISTENT_KEYRINGS
++	.persistent_keyring_register_sem =
++	__RWSEM_INITIALIZER(init_user_ns.persistent_keyring_register_sem),
+ #endif
+ };
+ EXPORT_SYMBOL_GPL(init_user_ns);
+-- 
+1.8.3.1
+


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