# 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/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-ld --version
# < git log --format=%s --max-count=1 d41a3effbb53b1bcea41e328d16a4d046a508381
# < make -s -j 10 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  allmodconfig
# make -s -j 10 ARCH=nds32 O=/kisskb/build/linus_nds32-allmodconfig_nds32le CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/nds32le-linux/bin/nds32le-linux-  
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/drivers/input/joystick/analog.c:160:2: warning: #warning Precise timer not defined for this architecture. [-Wcpp]
 #warning Precise timer not defined for this architecture.
  ^~~~~~~
/kisskb/src/drivers/soundwire/slave.c:16:12: warning: 'sdw_slave_add' defined but not used [-Wunused-function]
 static int sdw_slave_add(struct sdw_bus *bus,
            ^~~~~~~~~~~~~
WARNING: EXPORT symbol "clear_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "copy_page" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: "copy_page" [drivers/md/dm-integrity.ko] has no CRC!
WARNING: "clear_page" [drivers/md/dm-integrity.ko] has no CRC!
WARNING: "clear_page" [drivers/md/raid456.ko] has no CRC!
WARNING: "clear_page" [drivers/scsi/sd_mod.ko] has no CRC!
WARNING: "copy_page" [drivers/block/drbd/drbd.ko] has no CRC!
WARNING: "copy_page" [drivers/gpu/drm/ttm/ttm.ko] has no CRC!
WARNING: "clear_page" [drivers/gpu/drm/ttm/ttm.ko] has no CRC!
WARNING: "clear_page" [fs/gfs2/gfs2.ko] has no CRC!
WARNING: "copy_page" [fs/btrfs/btrfs.ko] has no CRC!
WARNING: "clear_page" [fs/btrfs/btrfs.ko] has no CRC!
WARNING: "clear_page" [fs/ocfs2/dlm/ocfs2_dlm.ko] has no CRC!
WARNING: "copy_page" [fs/cachefiles/cachefiles.ko] has no CRC!
WARNING: "copy_page" [fs/nilfs2/nilfs2.ko] has no CRC!
WARNING: "copy_page" [fs/fuse/fuse.ko] has no CRC!
WARNING: "clear_page" [fs/fuse/fuse.ko] has no CRC!
WARNING: "clear_page" [fs/ntfs/ntfs.ko] has no CRC!
Completed OK
# rm -rf /kisskb/build/linus_nds32-allmodconfig_nds32le
# Build took: 0:14:06.503555