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b992f01e66150fc5e90be4a96f5eb8e634c8249e
linux/kernel/bpf
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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
..
preload
bpf/preload: Clean up .gitignore and "clean-files" target
2021-10-20 10:39:04 -07:00
arraymap.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-10-28 10:43:58 -07:00
bloom_filter.c
bpf: Add missing map_get_next_key method to bloom filter map.
2021-12-29 09:38:31 -08:00
bpf_inode_storage.c
bpf: Allow bpf_local_storage to be used by sleepable programs
2021-12-29 17:54:40 -08:00
bpf_iter.c
bpf: Add bpf_loop helper
2021-11-30 10:56:28 -08:00
bpf_local_storage.c
bpf: Allow bpf_local_storage to be used by sleepable programs
2021-12-29 17:54:40 -08:00
bpf_lru_list.c
bpf_lru_list: Read double-checked variable once without lock
2021-02-10 15:54:26 -08:00
bpf_lru_list.h
bpf: Fix a typo "inacitve" -> "inactive"
2020-04-06 21:54:10 +02:00
bpf_lsm.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2021-06-17 11:54:56 -07:00
bpf_struct_ops_types.h
bpf: Add dummy BPF STRUCT_OPS for test purpose
2021-11-01 14:10:00 -07:00
bpf_struct_ops.c
bpf: Rename btf_member accessors.
2021-12-02 11:18:34 -08:00
bpf_task_storage.c
bpf: Allow bpf_local_storage to be used by sleepable programs
2021-12-29 17:54:40 -08:00
btf.c
bpf: Extend kfunc with PTR_TO_CTX, PTR_TO_MEM argument support
2021-12-18 18:11:47 -08:00
cgroup.c
bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.
2021-12-18 13:27:41 -08:00
core.c
bpf, docs: Prune all references to "internal BPF"
2021-11-30 10:52:11 -08:00
cpumap.c
xdp: Move conversion to xdp_frame out of map functions
2022-01-05 19:46:32 -08:00
devmap.c
xdp: Move conversion to xdp_frame out of map functions
2022-01-05 19:46:32 -08:00
disasm.c
bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause
2021-09-02 14:49:23 +02:00
disasm.h
bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause
2021-09-02 14:49:23 +02:00
dispatcher.c
bpf: Remove bpf_image tree
2020-03-13 12:49:52 -07:00
hashtab.c
bpf: Replace callers of BPF_CAST_CALL with proper function typedef
2021-09-28 16:27:18 -07:00
helpers.c
bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.
2021-12-18 13:27:41 -08:00
inode.c
bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags
2021-06-22 14:57:43 +02:00
Kconfig
bpf: Disallow unprivileged bpf by default
2021-11-01 17:06:47 +01:00
local_storage.c
bpf: Use struct_size() helper
2021-12-21 15:35:48 -08:00
lpm_trie.c
bpf: Fix typo in a comment in bpf lpm_trie.
2021-12-30 18:42:34 -08:00
Makefile
bpf: Prepare relo_core.c for kernel duty.
2021-12-02 11:18:34 -08:00
map_in_map.c
bpf: Remember BTF of inner maps.
2021-07-15 22:31:10 +02:00
map_in_map.h
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
map_iter.c
bpf: Introduce MEM_RDONLY flag
2021-12-18 13:27:41 -08:00
mmap_unlock_work.h
bpf: Introduce helper bpf_find_vma
2021-11-07 11:54:51 -08:00
net_namespace.c
net: Add includes masked by netdevice.h including uapi/bpf.h
2021-12-29 20:03:05 -08:00
offload.c
bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill
2020-02-17 16:53:49 +01:00
percpu_freelist.c
bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI
2020-10-06 00:04:11 +02:00
percpu_freelist.h
bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI
2020-10-06 00:04:11 +02:00
prog_iter.c
bpf: Refactor bpf_iter_reg to have separate seq_info member
2020-07-25 20:16:32 -07:00
queue_stack_maps.c
bpf: Eliminate rlimit-based memory accounting for queue_stack_maps maps
2020-12-02 18:32:46 -08:00
reuseport_array.c
bpf: Use struct_size() helper
2021-12-21 15:35:48 -08:00
ringbuf.c
bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.
2021-12-18 13:27:41 -08:00
stackmap.c
bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()
2022-01-15 12:21:23 +11:00
syscall.c
bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.
2021-12-18 13:27:41 -08:00
sysfs_btf.c
bpf: Load and verify kernel module BTFs
2020-11-10 15:25:53 -08:00
task_iter.c
bpf: Introduce btf_tracing_ids
2021-11-12 10:19:09 -08:00
tnum.c
bpf, tnums: Provably sound, faster, and more precise algorithm for tnum_mul
2021-06-01 13:34:15 +02:00
trampoline.c
bpf: Add get_func_[arg|ret|arg_cnt] helpers
2021-12-13 09:25:59 -08:00
verifier.c
bpf: Fix verifier support for validation of async callbacks
2022-01-05 13:38:22 -08:00