# git rev-parse -q --verify d41a3effbb53b1bcea41e328d16a4d046a508381^{commit}
d41a3effbb53b1bcea41e328d16a4d046a508381
already have revision, skipping fetch
# git checkout -q -f -B kisskb d41a3effbb53b1bcea41e328d16a4d046a508381
# git clean -qxdf
# < git log -1
# commit d41a3effbb53b1bcea41e328d16a4d046a508381
# Author: Hillf Danton <hdanton@sina.com>
# Date:   Mon Sep 2 13:37:29 2019 +0100
# 
#     keys: Fix missing null pointer check in request_key_auth_describe()
#     
#     If a request_key authentication token key gets revoked, there's a window in
#     which request_key_auth_describe() can see it with a NULL payload - but it
#     makes no check for this and something like the following oops may occur:
#     
#             BUG: Kernel NULL pointer dereference at 0x00000038
#             Faulting instruction address: 0xc0000000004ddf30
#             Oops: Kernel access of bad area, sig: 11 [#1]
#             ...
#             NIP [...] request_key_auth_describe+0x90/0xd0
#             LR [...] request_key_auth_describe+0x54/0xd0
#             Call Trace:
#             [...] request_key_auth_describe+0x54/0xd0 (unreliable)
#             [...] proc_keys_show+0x308/0x4c0
#             [...] seq_read+0x3d0/0x540
#             [...] proc_reg_read+0x90/0x110
#             [...] __vfs_read+0x3c/0x70
#             [...] vfs_read+0xb4/0x1b0
#             [...] ksys_read+0x7c/0x130
#             [...] system_call+0x5c/0x70
#     
#     Fix this by checking for a NULL pointer when describing such a key.
#     
#     Also make the read routine check for a NULL pointer to be on the safe side.
#     
#     [DH: Modified to not take already-held rcu lock and modified to also check
#      in the read routine]
#     
#     Fixes: 04c567d9313e ("[PATCH] Keys: Fix race between two instantiators of a key")
#     Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
#     Signed-off-by: Hillf Danton <hdanton@sina.com>
#     Signed-off-by: David Howells <dhowells@redhat.com>
#     Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 d41a3effbb53b1bcea41e328d16a4d046a508381
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_ps3_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  ps3_defconfig
# make -s -j 10 ARCH=powerpc O=/kisskb/build/linus_ps3_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/ipc/shm.c: In function 'ksys_shmdt':
/kisskb/src/ipc/shm.c:1712:59: warning: 'file' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<Ua280>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<Ua280>]' was declared here
/kisskb/src/fs/cifs/smb2pdu.c: In function 'SMB2_ioctl_init':
/kisskb/src/fs/cifs/smb2pdu.c:2676:19: warning: 'in_data_buf' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/bluetooth/hidp/core.c: In function 'hidp_connection_add':
/kisskb/src/net/bluetooth/hidp/core.c:1386:18: warning: 'session' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/mpi/mpicoder.c: In function 'mpi_read_raw_from_sgl':
/kisskb/src/lib/mpi/mpicoder.c:352:8: warning: 'buff' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/core/gen_stats.c: In function '__gnet_stats_copy_basic':
/kisskb/src/net/core/gen_stats.c:157:19: warning: 'seq' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/rhashtable.c: In function 'rht_deferred_worker':
/kisskb/src/include/linux/rhashtable.h:110:10: warning: 'next' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/rhashtable.c:222:28: note: 'next' was declared here
/kisskb/src/net/core/dev.c: In function 'validate_xmit_skb_list':
/kisskb/src/net/core/dev.c:3407:15: warning: 'tail' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1686:3: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/futex.c:1651:6: note: 'oldval' was declared here
/kisskb/src/net/mac80211/tx.c: In function 'ieee80211_build_hdr':
/kisskb/src/net/mac80211/tx.c:2518:27: warning: 'chanctx_conf' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:613:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1576:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1533:6: note: 'pwr_level_cisco' was declared here
/kisskb/src/fs/udf/unicode.c: In function 'udf_name_conv_char':
/kisskb/src/fs/udf/unicode.c:132:8: warning: 'c' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/linus_ps3_defconfig_powerpc-gcc4.6
# Build took: 0:02:33.403081