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b992f01e66150fc5e90be4a96f5eb8e634c8249e
linux/kernel
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Naveen N. Rao b992f01e66 bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack() 
task_pt_regs() can return NULL on powerpc for kernel threads. This is
then used in __bpf_get_stack() to check for user mode, resulting in a
kernel oops. Guard against this by checking return value of
task_pt_regs() before trying to obtain the call chain.

Fixes: fa28dcb82a ("bpf: Introduce helper bpf_get_task_stack()")
Cc: stable@vger.kernel.org # v5.9+
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d5ef83c361cc255494afd15ff1b4fb02a36e1dcf.1641468127.git.naveen.n.rao@linux.vnet.ibm.com
2022-01-15 12:21:23 +11:00
..
bpf
bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()
2022-01-15 12:21:23 +11:00
cgroup
Merge branch 'for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2022-01-11 09:14:37 -08:00
configs
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debug
kdb: Adopt scheduler's task classification
2021-11-03 17:21:37 +00:00
dma
dma-direct: add a dma_direct_use_pool helper
2021-12-08 16:46:35 +01:00
entry
entry: Snapshot thread flags
2021-12-01 00:06:43 +01:00
events
Merge tag 'perf_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-01-12 16:26:58 -08:00
futex
futex: Remove futex_cmpxchg detection
2021-11-25 00:02:28 +01:00
gcov
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irq
Merge tag 'irq-msi-2022-01-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-01-13 09:05:29 -08:00
kcsan
Merge tag 'kcsan.2022.01.09a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
2022-01-11 09:51:26 -08:00
livepatch
Merge tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2021-11-01 20:05:19 -07:00
locking
Merge tag 'locking_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-01-11 17:24:45 -08:00
power
PM: hibernate: Allow ACPI hardware signature to be honoured
2021-12-08 16:06:10 +01:00
printk
printk/console: Clean up boot console handling in register_console()
2021-12-06 14:07:57 +01:00
rcu
Merge branches 'doc.2021.11.30c', 'exp.2021.12.07a', 'fastnohz.2021.11.30c', 'fixes.2021.11.30c', 'nocb.2021.12.09a', 'nolibc.2021.11.30c', 'tasks.2021.12.09a', 'torture.2021.12.07a' and 'torturescript.2021.11.30c' into HEAD
2021-12-09 11:38:09 -08:00
sched
Merge tag 'locking_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-01-11 17:24:45 -08:00
time
Merge tag 'timers-core-2022-01-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-01-13 09:02:27 -08:00
trace
Merge tag 'for-5.17/block-2022-01-11' of git://git.kernel.dk/linux-block
2022-01-12 10:26:52 -08:00
.gitignore
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acct.c
kernel: remove spurious blkdev.h includes
2021-10-18 06:17:01 -06:00
async.c
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audit_fsnotify.c
fsnotify: clarify contract for create event hooks
2021-10-27 12:32:34 +02:00
audit_tree.c
audit: use struct_size() helper in kmalloc()
2021-12-14 17:39:42 -05:00
audit_watch.c
Merge tag 'fsnotify_for_v5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2021-11-06 16:43:20 -07:00
audit.c
Merge tag 'audit-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2022-01-11 13:08:21 -08:00
audit.h
Merge tag 'audit-pr-20211101' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2021-11-01 21:17:39 -07:00
auditfilter.c
Merge tag 'audit-pr-20220110' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
2022-01-11 13:08:21 -08:00
auditsc.c
lsm: security_task_getsecid_subj() -> security_current_getsecid_subj()
2021-11-22 17:52:47 -05:00
backtracetest.c
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bounds.c
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capability.c
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cfi.c
…
compat.c
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configs.c
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context_tracking.c
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cpu_pm.c
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cpu.c
sched/scs: Reset task stack state in bringup_cpu()
2021-11-24 12:20:27 +01:00
crash_core.c
kernel/crash_core: suppress unknown crashkernel parameter warning
2021-12-25 12:20:55 -08:00
crash_dump.c
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cred.c
ucounts: In set_cred_ucounts assume new->ucounts is non-NULL
2021-10-20 10:45:34 -05:00
delayacct.c
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dma.c
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exec_domain.c
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exit.c
Merge branch 'per_signal_struct_coredumps-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-03 12:15:29 -07:00
extable.c
extable: use is_kernel_text() helper
2021-11-09 10:02:51 -08:00
fail_function.c
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fork.c
fork: move copy_io to block/blk-ioc.c
2021-11-29 06:41:29 -07:00
freezer.c
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gen_kheaders.sh
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groups.c
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hung_task.c
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iomem.c
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irq_work.c
irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ on PREEMPT_RT
2021-10-15 11:25:18 +02:00
jump_label.c
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kallsyms.c
kallsyms: strip LTO suffixes from static functions
2021-10-04 10:58:25 -07:00
kcmp.c
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Kconfig.freezer
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Kconfig.hz
…
Kconfig.locks
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Kconfig.preempt
preempt: Restore preemption model selection configs
2021-11-11 13:09:33 +01:00
kcov.c
kcov: replace local_irq_save() with a local_lock_t
2021-11-09 10:02:52 -08:00
kexec_core.c
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kexec_elf.c
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kexec_file.c
memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED
2021-11-06 13:30:42 -07:00
kexec_internal.h
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kexec.c
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kheaders.c
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kmod.c
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kprobes.c
kprobes: Limit max data_size of the kretprobe instances
2021-12-01 21:04:34 -05:00
ksysfs.c
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kthread.c
Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-11-10 16:15:54 -08:00
latencytop.c
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Makefile
Merge tag 'trace-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
2021-11-01 20:05:19 -07:00
module_signature.c
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module_signing.c
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module-internal.h
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module.c
module: change to print useful messages from elf_validity_check()
2021-11-05 15:13:10 -07:00
notifier.c
notifier: Return an error when a callback has already been registered
2021-12-29 10:37:33 +01:00
nsproxy.c
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padata.c
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panic.c
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params.c
kobject: remove kset from struct kset_uevent_ops callbacks
2021-12-28 11:26:18 +01:00
pid_namespace.c
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pid.c
pid: add pidfd_get_task() helper
2021-10-14 13:29:18 +02:00
profile.c
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ptrace.c
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range.c
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reboot.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2021-11-12 11:53:16 -08:00
regset.c
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relay.c
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resource_kunit.c
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resource.c
kernel/resource: disallow access to exclusive system RAM regions
2021-11-09 10:02:52 -08:00
rseq.c
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scftorture.c
scftorture: Always log error message
2021-12-07 16:36:17 -08:00
scs.c
scs: Release kasan vmalloc poison in scs_free process
2021-09-30 09:37:27 +01:00
seccomp.c
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signal.c
signal: Skip the altstack update when not needed
2021-12-14 13:08:36 -08:00
smp.c
sched: Improve wake_up_all_idle_cpus() take #2
2021-10-22 15:32:46 +02:00
smpboot.c
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smpboot.h
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softirq.c
timers/nohz: Last resort update jiffies on nohz_full IRQ entry
2021-12-02 15:07:22 +01:00
stackleak.c
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stacktrace.c
stacktrace: move filter_irq_stacks() to kernel/stacktrace.c
2021-11-06 13:30:43 -07:00
static_call.c
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stop_machine.c
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sys_ni.c
futex: Implement sys_futex_waitv()
2021-10-07 13:51:11 +02:00
sys.c
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sysctl-test.c
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sysctl.c
net: Don't include filter.h from net/sock.h
2021-12-29 08:48:14 -08:00
task_work.c
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taskstats.c
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torture.c
locktorture,rcutorture,torture: Always log error message
2021-12-07 16:36:17 -08:00
tracepoint.c
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tsacct.c
mm/mmap.c: fix a data race of mm->total_vm
2021-11-06 13:30:35 -07:00
ucount.c
ucounts: Fix rlimit max values check
2021-12-09 15:37:18 -06:00
uid16.c
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uid16.h
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umh.c
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up.c
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user_namespace.c
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user-return-notifier.c
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user.c
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usermode_driver.c
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utsname_sysctl.c
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utsname.c
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watch_queue.c
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watchdog_hld.c
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watchdog.c
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workqueue_internal.h
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workqueue.c
Merge branch 'workqueue/for-5.16-fixes' into workqueue/for-5.17
2022-01-10 07:54:04 -10:00