T.J. Mercier b7a2957ace bpf: Fix truncated dmabuf iterator reads ... [ Upstream commit 234483565dbb2b264fdd165927c89fbf3ecf4733 ] If there is a large number (hundreds) of dmabufs allocated, the text output generated from dmabuf_iter_seq_show can exceed common user buffer sizes (e.g. PAGE_SIZE) necessitating multiple start/stop cycles to iterate through all dmabufs. However the dmabuf iterator currently returns NULL in dmabuf_iter_seq_start for all non-zero pos values, which results in the truncation of the output before all dmabufs are handled. After dma_buf_iter_begin / dma_buf_iter_next, the refcount of the buffer is elevated so that the BPF iterator program can run without holding any locks. When a stop occurs, instead of immediately dropping the reference on the buffer, stash a pointer to the buffer in seq->priv until either start is called or the iterator is released. This also enables the resumption of iteration without first walking through the list of dmabufs based on the pos value. Fixes: 76ea955349 ("bpf: Add dmabuf iterator") Signed-off-by: T.J. Mercier <tjmercier@google.com> Link: https://lore.kernel.org/r/20251204000348.1413593-1-tjmercier@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2026-01-02 12:56:37 +01:00
..
preload	umd: Remove usermode driver framework	2025-07-26 21:03:04 +02:00
arena.c	bpf: Report arena faults to BPF stderr	2025-09-11 13:00:43 -07:00
arraymap.c	bpf: bpf task work plumbing	2025-09-23 07:34:38 -07:00
bloom_filter.c
bpf_cgrp_storage.c	bpf: use rcu_read_lock_dont_migrate() for bpf_cgrp_storage_free()	2025-08-25 18:52:16 -07:00
bpf_inode_storage.c	bpf: use rcu_read_lock_dont_migrate() for bpf_inode_storage_free()	2025-08-25 18:52:16 -07:00
bpf_iter.c	bpf: use rcu_read_lock_dont_migrate() for bpf_iter_run_prog()	2025-08-25 18:52:16 -07:00
bpf_local_storage.c	bpf: add btf_type_is_i{32,64} helpers	2025-06-25 15:15:49 -07:00
bpf_lru_list.c	bpf: Replace get_next_cpu() with cpumask_next_wrap()	2025-08-18 15:11:02 +02:00
bpf_lru_list.h	bpf: Adjust free target to avoid global starvation of LRU map	2025-06-18 18:50:14 -07:00
bpf_lsm.c	bpf: lsm: Add two more sleepable hooks	2025-02-13 19:35:31 -08:00
bpf_struct_ops.c	bpf: Allow struct_ops to get map id by kdata	2025-08-06 13:39:58 -07:00
bpf_task_storage.c	bpf: use rcu_read_lock_dont_migrate() for bpf_task_storage_free()	2025-08-25 18:52:16 -07:00
btf_iter.c
btf_relocate.c
btf.c	bpf: Allow union argument in trampoline based programs	2025-09-23 12:07:46 -07:00
cgroup_iter.c
cgroup.c	bpf: WQ_PERCPU added to alloc_workqueue users	2025-09-08 10:04:37 -07:00
core.c	bpf: Enforce expected_attach_type for tailcall compatibility	2025-09-27 06:24:27 -07:00
cpumap.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf after rc5	2025-09-11 09:34:37 -07:00
cpumask.c	bpf: fix missing kdoc string fields in cpumask.c	2025-03-15 11:48:57 -07:00
crypto.c	bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt	2025-09-09 15:07:57 -07:00
devmap.c	bpf: Remove redundant __GFP_NOWARN	2025-08-12 14:56:04 -07:00
disasm.c	bpftool: Using the right format specifiers	2025-03-17 13:50:56 -07:00
disasm.h
dispatcher.c	bpf: Add kernel symbol for struct_ops trampoline	2024-11-12 17:13:46 -08:00
dmabuf_iter.c	bpf: Fix truncated dmabuf iterator reads	2026-01-02 12:56:37 +01:00
hashtab.c	bpf: Free special fields when update [lru_,]percpu_hash maps	2025-12-18 14:02:59 +01:00
helpers.c	bpf: Prevent nesting overflow in bpf_try_get_buffers	2025-12-18 14:03:01 +01:00
inode.c	bpf: Avoid RCU context warning when unpinning htab with internal structs	2025-10-10 10:10:08 -07:00
Kconfig	bpf: Update the bpf_prog_calc_tag to use SHA256	2025-09-18 19:10:20 -07:00
kmem_cache_iter.c
link_iter.c	bpf: Clean up individual BTF_ID code	2025-07-16 18:34:42 -07:00
liveness.c	bpf: Fix memory leak in __lookup_instance error path	2025-10-16 10:45:17 -07:00
local_storage.c	bpf: Remove redundant __GFP_NOWARN	2025-08-12 14:56:04 -07:00
log.c	bpf: disable and remove registers chain based liveness	2025-09-19 09:27:23 -07:00
lpm_trie.c	bpf: Convert lpm_trie.c to rqspinlock	2025-03-19 08:03:05 -07:00
Makefile	bpf: callchain sensitive stack liveness tracking using CFG	2025-09-19 09:27:23 -07:00
map_in_map.c
map_in_map.h
map_iter.c
memalloc.c	bpf: replace use of system_unbound_wq with system_dfl_wq	2025-09-08 10:04:37 -07:00
mmap_unlock_work.h
mprog.c
net_namespace.c	bpf: Remove attach_type in bpf_netns_link	2025-07-11 11:01:04 -07:00
offload.c	net: move misc netdev_lock flavors to a separate header	2025-03-08 09:06:50 -08:00
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: Convert queue_stack map to rqspinlock	2025-04-10 12:51:10 -07:00
range_tree.c	bpf: Disable migration before calling ops->map_free()	2025-01-08 18:06:36 -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
ringbuf.c	bpf: Sync pending IRQ work before freeing ring buffer	2025-10-21 09:57:48 -07:00
rqspinlock.c	rqspinlock: Use trylock fallback when per-CPU rqnode is busy	2025-12-18 14:03:28 +01:00
rqspinlock.h	rqspinlock: Protect waiters in queue from stalls	2025-03-19 08:03:05 -07:00
stackmap.c	bpf: Fix stackmap overflow check in __bpf_get_stackid()	2025-12-18 14:02:42 +01:00
stream.c	bpf: add _impl suffix for bpf_stream_vprintk() kfunc	2025-11-04 17:50:25 -08:00
syscall.c	bpf: Fix exclusive map memory leak	2025-12-18 14:03:22 +01:00
sysfs_btf.c	Driver core changes for 6.17-rc1	2025-07-29 12:15:39 -07:00
task_iter.c	vfs-6.13.file	2024-11-18 10:30:29 -08:00
tcx.c	bpf: Remove location field in tcx_link	2025-07-11 11:00:57 -07:00
tnum.c	bpf: Improve the general precision of tnum_mul	2025-08-27 15:00:26 -07:00
token.c	bpf: Add struct bpf_token_info	2025-07-16 18:38:05 -07:00
trampoline.c	bpf: Handle return value of ftrace_set_filter_ip in register_fentry	2025-12-18 14:03:01 +01:00
verifier.c	bpf: properly verify tail call behavior	2025-12-18 14:03:11 +01:00