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b26c0b2dd5195f3397e7f64fefc9c190ebba7204
linux/kernel/bpf
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Kumar Kartikeya Dwivedi b26c0b2dd5 bpf: Preserve R0 lineage across helper calls 
check_helper_call() clears all caller-saved registers before taking the
diagnostic snapshot of R0. This records NOT_INIT as the old state for every
helper return and loses the lineage of the value held in R0 before the call.
bpf_diag_record_caller_saved() deliberately skips R0 because the paired
modification scope is responsible for it.

Open the R0 modification scope before clearing caller-saved registers,
matching the kfunc, ld_abs, and subprogram call paths.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260815073833.A93A91F000E9@smtp.kernel.org
Link: https://lore.kernel.org/bpf/48e6f021b89562f68850fe21ef8c78719819b04cf9c4e4f50bc791937d37ace8@mail.kernel.org
Link: https://lore.kernel.org/bpf/20260816015746.2632990-4-memxor@gmail.com
2026-08-17 11:58:21 +02:00
..
preload
umd: Remove usermode driver framework
2025-07-26 21:03:04 +02:00
arena.c
bpf: Mark existing lock-safe kfuncs with KF_SPINLOCK_SAFE
2026-08-06 10:58:04 +02:00
arraymap.c
bpf: Populate mmap-able array map memory lazily
2026-08-14 15:31:30 -07:00
backtrack.c
bpf: Drop duplicate blank lines in kernel/bpf/
2026-08-13 10:27:40 -07:00
bloom_filter.c
bpf: Harden bloom filter sizing and indexing on 32-bit kernels
2026-08-05 11:45:20 -07:00
bpf_cgrp_storage.c
bpf: Remove gfp_flags plumbing from bpf_local_storage_update()
2026-04-10 21:22:32 -07:00
bpf_inode_storage.c
bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
2026-06-30 16:31:56 +02:00
bpf_insn_array.c
bpf: Lose const-ness of map in map_check_btf()
2026-02-27 15:39:00 -08:00
bpf_iter.c
bpf: Inline bpf_iter_num_destroy() as a no-op
2026-08-05 10:44:35 -07:00
bpf_local_storage.c
bpf: Remove gfp_flags plumbing from bpf_local_storage_update()
2026-04-10 21:22:32 -07:00
bpf_lru_list.c
bpf: Fix NMI/tracepoint re-entry deadlock on lru locks
2026-06-07 18:46:13 -07:00
bpf_lru_list.h
bpf: Fix NMI/tracepoint re-entry deadlock on lru locks
2026-06-07 18:46:13 -07:00
bpf_lsm_proto.c
bpf: annotate file argument as __nullable in bpf_lsm_mmap_file
2025-12-21 10:56:33 -08:00
bpf_lsm.c
bpf: Rename ARG_CONST_SIZE{,_OR_ZERO} to ARG_MEM_SIZE{,_OR_ZERO}
2026-08-03 00:29:14 +02:00
bpf_struct_ops.c
bpf: Support __arena and __arena__nullable on struct_ops arguments
2026-08-08 03:03:26 -07:00
bpf_task_storage.c
bpf: Remove gfp_flags plumbing from bpf_local_storage_update()
2026-04-10 21:22:32 -07:00
btf_iter.c
…
btf_relocate.c
…
btf.c
bpf: Add source and instruction diagnostic context
2026-08-15 11:11:16 -07:00
cfg.c
bpf: Report Program Structure CFG errors
2026-08-15 11:15:17 -07:00
cgroup_iter.c
bpf: add new BPF_CGROUP_ITER_CHILDREN control option
2026-01-27 09:05:54 -08:00
cgroup.c
bpf: Reject negative optlen in cgroup getsockopt hook
2026-08-17 11:33:29 +02:00
check_btf.c
bpf: Rename 'early' BTF checking as a preparation phase
2026-08-08 03:03:25 -07:00
cnum_defs.h
bpf: Export cnum_umin/umax() helpers for netronome driver
2026-04-27 10:09:48 -07:00
cnum.c
bpf: representation and basic operations on circular numbers
2026-04-24 18:14:17 -07:00
const_fold.c
bpf: Introduce global percpu data
2026-08-13 10:27:40 -07:00
core.c
bpf: Add source and instruction diagnostic context
2026-08-15 11:11:16 -07:00
cpumap.c
bpf: Add missing XDP_ABORTED handling in cpumap
2026-03-03 08:37:21 -08:00
cpumask.c
bpf: Require a BPF cpumask for bpf_cpumask_populate()
2026-07-12 01:52:36 +02:00
crypto.c
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
devmap.c
bpf: Run generic devmap egress prog on private skb
2026-06-12 18:21:01 -07:00
diagnostics.c
bpf: Report Policy helper and kfunc errors
2026-08-15 11:15:17 -07:00
diagnostics.h
bpf: Report Policy helper and kfunc errors
2026-08-15 11:15:17 -07:00
disasm.c
bpf: Do not print a newline after disassembly in bpf_verbose_insn()
2026-08-08 11:05:49 +02:00
disasm.h
…
dispatcher.c
bpf: dispatcher: Allocate bpf_dispatcher->rw_image with vzalloc()
2026-07-22 17:26:39 +02:00
dmabuf_iter.c
bpf: Fix truncated dmabuf iterator reads
2025-12-09 23:48:34 -08:00
fixups.c
bpf: Rewrite any fault prone load out of a mem or btf_id pointer
2026-08-17 10:06:42 +02:00
hashtab.c
bpf: Drop duplicate blank lines in kernel/bpf/
2026-08-13 10:27:40 -07:00
helpers.c
bpf: Fix arm64 KASAN false positive after bpf_throw
2026-08-14 18:26:14 +02:00
inode.c
Merge tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2026-06-17 09:18:14 +01:00
Kconfig
bpf: Update the bpf_prog_calc_tag to use SHA256
2025-09-18 19:10:20 -07:00
kmem_cache_iter.c
bpf: Add open coded version of kmem_cache iterator
2024-11-01 11:08:32 -07:00
link_iter.c
bpf: Clean up individual BTF_ID code
2025-07-16 18:34:42 -07:00
liveness.c
bpf: Drop duplicate blank lines in kernel/bpf/
2026-08-13 10:27:40 -07:00
local_storage.c
bpf: fix end-of-list detection in cgroup_storage_get_next_key()
2026-04-05 18:45:05 -07:00
log.c
bpf: Track verifier register diagnostic events
2026-08-15 11:11:16 -07:00
lpm_trie.c
bpf: Allow LPM map access from sleepable BPF programs
2026-06-09 12:42:22 -07:00
Makefile
bpf: Add verifier diagnostics report helpers
2026-08-15 11:11:16 -07:00
map_in_map.c
bpf: Reject exclusive maps as inner maps in map-in-map
2026-06-01 18:36:40 -07:00
map_in_map.h
…
map_iter.c
bpf: Implement iteration ops for resizable hashtab
2026-06-05 08:00:08 -07:00
memalloc.c
bpf: Retire rcu_trace_implies_rcu_gp()
2026-04-07 12:24:49 -07:00
mmap_unlock_work.h
bpf: Fix mmap_lock leak in irq_work path
2026-08-08 10:25:36 +02:00
mprog.c
…
net_namespace.c
bpf: Fix potential UAF in bpf_netns_link_update_prog
2026-07-30 15:28:46 -07:00
offload.c
bpf: Fix use-after-free in offloaded map/prog info fill
2026-04-09 13:24:32 -07:00
percpu_freelist.c
bpf: Convert percpu_freelist.c to rqspinlock
2025-03-19 08:03:05 -07:00
percpu_freelist.h
bpf: Convert percpu_freelist.c to rqspinlock
2025-03-19 08:03:05 -07:00
prog_iter.c
bpf: Clean up individual BTF_ID code
2025-07-16 18:34:42 -07:00
queue_stack_maps.c
bpf: Drop duplicate blank lines in kernel/bpf/
2026-08-13 10:27:40 -07:00
range_tree.c
bpf: arena: Reintroduce memcg accounting
2026-01-02 14:31:59 -08:00
range_tree.h
bpf: Introduce range_tree data structure and use it in bpf arena
2024-11-13 13:52:45 -08:00
relo_core.c
…
reuseport_array.c
bpf: Use sockfd_put() helper
2024-08-30 08:57:47 -07:00
ringbuf.c
bpf: Fix available-data accounting on 32-bit wrap in overwrite mode
2026-08-14 15:20:37 -07:00
rqspinlock.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 7.2-rc7
2026-08-07 23:04:17 +02:00
rqspinlock.h
rqspinlock: Protect waiters in queue from stalls
2025-03-19 08:03:05 -07:00
stackmap.c
bpf: Fix mmap_lock leak in irq_work path
2026-08-08 10:25:36 +02:00
states.c
bpf: Compare iterator types during state pruning
2026-08-11 14:57:00 -07:00
stream.c
bpf: Add bpf_stream_print_stack stack dumping kfunc
2026-02-03 10:41:16 -08:00
syscall.c
bpf: Populate mmap-able array map memory lazily
2026-08-14 15:31:30 -07:00
sysfs_btf.c
Merge tag 'driver-core-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core
2025-07-29 12:15:39 -07:00
task_iter.c
bpf: Fix mmap_lock leak in irq_work path
2026-08-08 10:25:36 +02:00
tcx.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
tnum.c
bpf: Simplify tnum_step()
2026-03-24 08:45:29 -07:00
token.c
treewide: Replace kmalloc with kmalloc_obj for non-scalar types
2026-02-21 01:02:28 -08:00
trampoline.c
bpf: Make bpf_trampoline_multi_detach return void
2026-08-13 02:52:23 +02:00
verifier.c
bpf: Preserve R0 lineage across helper calls
2026-08-17 11:58:21 +02:00