bpf_rb_root_free() detaches the root by copying the current rb_root_cached
and then replacing the live root with RB_ROOT_CACHED. It then walks the
copied root and drops each object contained in the tree.
This leaves the rb node state intact while dropping the object. If the
object is refcounted and survives the drop, its bpf_rb_node_kern still
contains an owner pointer to the freed root and stale rb tree linkage. If
a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove()
can incorrectly pass the owner check and call rb_erase_cached() on a node
whose rb pointers belong to the old tree.
Mirror the list draining behavior by marking nodes as busy while the root
is being detached, then clear the rb node and release the owner before
dropping the containing object. This makes surviving nodes unowned and
safe to reject from remove or accept for a later add.
Fixes: 9c395c1b99 ("bpf: Add basic bpf_rb_{root,node} support")
Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260605094143.5509-1-kaitao.cheng@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
use_file_dynptr_slice_after_put_file() reads the dynptr via
bpf_dynptr_data(), which always returns NULL for a read-only file
dynptr, making the example confusing. Switch to bpf_dynptr_slice(), the
correct read API for file dynptrs, and read (rather than write) the slice
since it is read-only. The test still fails as expected.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-6-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
check_ids() warned when it ran out of idmap slots, assuming this was
impossible because the slots are bounded by the number of registers and
stack slots. That assumption no longer holds: referenced dynptrs acquire
an intermediate reference that lives in refs[] but is not backed by any
register or stack slot [0], so a program can accumulate more reference
ids than the idmap can hold and exhaust it.
Exhaustion is fine for verification correctness. check_ids() already
returns false, which makes the states compare as not equivalent and
prevents unsound pruning. The only effect of the WARN_ON_ONCE() is log
noise, or a panic under panic_on_warn. Drop the warning and keep
returning false.
[0] 308c7a0ae8 ("bpf: Refactor object relationship tracking and fix dynptr UAF bug")
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-5-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
refsafe() compared each reference's id and type but not its parent_id,
so two states whose PTR references differ only in the parent object they
were derived from could be wrongly treated as equivalent and pruned. Fix
it by checking parent_id too.
Fixes: 308c7a0ae8 ("bpf: Refactor object relationship tracking and fix dynptr UAF bug")
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-4-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
When acquiring references for struct_ops program arguments tagged with
"__ref", the return value of acquire_reference() was stored directly
into u32 ctx_arg_info[i].ref_id without checking for failure.
acquire_reference() returns -ENOMEM when acquire_reference_state() fails
to allocate, so the error was silently stored as a ref_id instead of
aborting verification. Fix it by checking the return.
Fixes: a687df2008 ("bpf: Support getting referenced kptr from struct_ops argument")
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-3-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
acquire_reference() returns a signed int that may be a negative errno
but was converted to unsigned, which makes the subsequent error check
deadcode. Fix it by declaring 'id' as int so the error path is taken
correctly.
Fixes: 308c7a0ae8 ("bpf: Refactor object relationship tracking and fix dynptr UAF bug")
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-2-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
When the perf build executes 'make -C ../bpf/bpftool bootstrap', bpftool's
Makefile unconditionally evaluated feature checks for llvm, libcap, libbfd,
and disassembler libraries because the bootstrap target was not exempted.
Since the bootstrap bpftool strictly compiles minimal AST parsing and C
code generation logic without linking LLVM or disassembler libraries, these
feature check sub-makes are completely redundant.
Exempt the bootstrap target from non-essential feature tests to eliminate
unneeded sub-make fork overhead during Kbuild startup.
Tested-by: James Clark <james.clark@linaro.org>
Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/r/20260531010750.525160-1-irogers@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
file_reader/on_open_expect_fault test expects page fault
when reading pages from the test harness executable.
It is not guaranteed that those are paged out, even
after madvise(MADV_PAGEOUT).
Relax the condition in the test to succeed with both
0 and -EFAULT returned.
Fixes: 784cdf9315 ("selftests/bpf: add file dynptr tests")
Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Closes: https://lore.kernel.org/all/ah6g7JSYOWGp2oAG@u94a/
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Tested-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260603-file_reader_flake-v1-1-7f3f52d1e388@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
apply_range_set_cb() maps the pages for a new arena allocation and returned
-EBUSY when the target PTE was already populated. Kernel-fault recovery
leaves the per-arena scratch page in unallocated arena PTEs, so a later
bpf_arena_alloc_pages() over such a page hits that -EBUSY, and every
subsequent allocation of it fails the same way. Allocation must install the
real page over scratch instead.
Overwriting the scratch PTE in place is a valid->valid change, which arm64
forbids without break-before-make. Route through an invalid entry instead:
ptep_try_set() fills only a none slot, so the PTE goes scratch->none->page.
On finding scratch, clear it and flush_tlb_before_set() before retrying. The
new flush_tlb_before_set() is a no-op except on arches like arm64 that need
the break-before-make TLB invalidate. The loop also copes with a concurrent
fault re-scratching the slot.
Arches without ptep_try_set() never install the scratch page, so keep the
must-be-empty check and set_pte_at() for them.
Fixes: dc11a4dba2 ("bpf: Recover arena kernel faults with scratch page")
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260601183728.1800490-1-tj@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Devmap broadcast redirects clone the packet for all but the last
destination.
For native XDP, that clone path copies only the linear xdp_frame data,
while fragmented frames keep skb_shared_info in tailroom outside the
linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but
without valid frag metadata, and the later free path can interpret
uninitialized tail data as skb_shared_info, leading to an out-of-bounds
access during frame return.
Reject fragmented native XDP frames in dev_map_enqueue_clone().
Add the same restriction to the generic XDP clone path in
dev_map_redirect_clone(). Generic XDP represents fragmented packets as
nonlinear skbs, and rejecting them here keeps clone-based broadcast
support aligned between native and generic XDP.
Fixes: e624d4ed4a ("xdp: Extend xdp_redirect_map with broadcast support")
Cc: stable@kernel.org
Reported-by: Yuan Tan <yuantan098@gmail.com>
Reported-by: Zhengchuan Liang <zcliangcn@gmail.com>
Reported-by: Xin Liu <bird@lzu.edu.cn>
Assisted-by: Codex:GPT-5.4
Signed-off-by: Zhao Zhang <zzhan461@ucr.edu>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/21c2d153dd25603d359069a02bf06779b51f6423.1780385378.git.zzhan461@ucr.edu
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Search for duplicated kfunc in btf_vmlinux and btf_modules
before a kernel module attempts to register a kfunc.
If kfunc would shadow existing kfunc then pr_err() and
reject module loading.
Reviewed-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Song Chen <chensong_2000@126.com>
Link: https://lore.kernel.org/r/20260603091910.7212-1-chensong_2000@126.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Add myself as a reviewer for the BPF subsystem. While at it, run
./scripts/parse_maintainers.pl --order and reorder the BPF-related
entries in the file accordingly.
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260604184252.9917-1-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Mykyta Yatsenko says:
====================
bpf: Introduce resizable hash map
This patch series introduces BPF_MAP_TYPE_RHASH, a new hash map type that
leverages the kernel's rhashtable to provide resizable hash map for BPF.
The existing BPF_MAP_TYPE_HASH uses a fixed number of buckets determined at
map creation time. While this works well for many use cases, it presents
challenges when:
1. The number of elements is unknown at creation time
2. The element count varies significantly during runtime
3. Memory efficiency is important (over-provisioning wastes memory,
under-provisioning hurts performance)
BPF_MAP_TYPE_RHASH addresses these issues by using rhashtable, which
automatically grows and shrinks based on load factor.
The implementation wraps the kernel's rhashtable with BPF map operations:
- Uses bpf_mem_alloc for RCU-safe memory management
- Supports all standard map operations (lookup, update, delete, get_next_key)
- Supports batch operations (lookup_batch, lookup_and_delete_batch)
- Supports BPF iterators for traversal
- Supports BPF_F_LOCK for spin locks in values
- Requires BPF_F_NO_PREALLOC flag (elements allocated on demand)
- In-place updates for improved performance.
- max_entries serves as a hard limit, not bucket count
- Uses bit_spin_lock() + local_irq_save() for bucket locking,
similar to existing BPF hashmap's raw_spin_lock_irqsave(), insertions and
deletes may fail.
- Iterations are best-effort, if resize, insertions, deletions take place
concurrently, iterations may visit same elements multiple times or skip
elements.
- Lock out insertions, when running special fields destructor to guarantee
its completion.
The series includes comprehensive tests:
- Basic operations in test_maps (lookup, update, delete, get_next_key)
- BPF program tests for lookup/update/delete semantics
- Seq file tests
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
Update implementation
---------------------
Current implementation of the BPF_MAP_TYPE_RHASH does not provide
the same strong guarantees on the values consistency under concurrent
reads/writes as BPF_MAP_TYPE_HASH.
BPF_MAP_TYPE_HASH allocates a new element and atomically swaps the
pointer. BPF_MAP_TYPE_RHASH does memcpy in place with no lock held.
rhash trades consistency for speed, concurrent readers can observe
partially updated data. Two concurrent writers to the same key can
also interleave, producing mixed values. This is similar to arraymap
update implementation, including handling of the special fields.
As a solution, user may use BPF_F_LOCK to guarantee consistent reads
and write serialization.
Summary of the read consistency guarantees:
map type | write mechanism | read consistency
-------------+------------------+--------------------------
htab | alloc, swap ptr | always consistent (RCU)
htab F_LOCK | in-place + lock | consistent if reader locks
-------------+------------------+--------------------------
rhtab | in-place memcpy | torn reads
rhtab F_LOCK | in-place + lock | consistent if reader locks
Benchmarks
----------
1. LOOKUP (single producer, M events/sec)
key | max | nr | htab | rhtab | ratio | delta
----+-----+-------+---------+---------+-------+-------
8 | 1K | 750 | 99.85 | 81.92 | 0.82x | -18 %
8 | 1K | 1K | 100.71 | 80.19 | 0.80x | -20 %
8 | 1M | 750K | 23.37 | 72.09 | 3.08x | +208 %
8 | 1M | 1M | 13.39 | 53.72 | 4.01x | +301 %
32 | 1K | 750 | 51.57 | 42.78 | 0.83x | -17 %
32 | 1K | 1K | 50.81 | 45.83 | 0.90x | -10 %
32 | 1M | 750K | 11.27 | 15.29 | 1.36x | +36 %
32 | 1M | 1M | 7.32 | 8.75 | 1.19x | +19 %
256 | 1K | 750 | 7.58 | 7.88 | 1.04x | +4 %
256 | 1K | 1K | 7.43 | 7.81 | 1.05x | +5 %
256 | 1M | 750K | 3.69 | 4.27 | 1.16x | +16 %
256 | 1M | 1M | 2.60 | 3.12 | 1.20x | +20 %
Pattern:
* Small map (1K): htab wins for 8 / 32 byte keys by 10-20 %
because the preallocated bucket array fits in L1. Equalises
at 256 byte keys.
* Large map (1M): rhtab wins everywhere, up to 4x at high load
factor with 8 byte keys.
* Higher load factor amplifies rhtab's lead: rhtab grows the
bucket array; htab stays at user-declared max.
2. FULL UPDATE (M events/sec per producer, -p 7)
htab per-producer:
20.33 22.02 19.27 23.61 24.18 23.17 21.07
mean 21.94 range 19.27 - 24.18
rhtab per-producer:
133.51 129.47 74.52 129.29 102.26 129.98 107.64
mean 115.24 range 74.52 - 133.51
speedup (mean): 5.25x (+425 %)
In-place memcpy avoids the per-update alloc + RCU pointer swap
that htab pays.
3. MEMORY (overwrite, -p 8, no --preallocated)
value_size | htab ops/s | rhtab ops/s | htab mem | rhtab mem
-----------+-------------+-------------+----------+----------
32 B | 122.87 k/s | 133.04 k/s | 2.47 MiB | 2.49 MiB
4096 B | 64.43 k/s | 65.38 k/s | 6.74 MiB | 6.44 MiB
rhtab/htab : +8 % ops, +0.8 % mem (32 B)
+1 % ops, -4 % mem (4096 B)
SUMMARY
* Small / well-fitting map: htab is faster (cache-friendly
fixed bucket array), but only by ~10-20 %.
* Large / high-load-factor map: rhtab is dramatically faster
(1.2x to 4x) because rhashtable resizes to keep the load
factor sane while htab stays stuck at user-declared max.
* Update-heavy workloads: rhtab is ~5x faster per producer
via in-place memcpy.
* Memory benchmark: effectively on par
---
Changes in v7:
- rhashtable_next_key: move into lib/rhashtable.c, drop params argument
(Herbert).
- rhashtable_next_key: kdoc clarifies that behavior on tables with
duplicate keys is undefined (sashiko).
- rhashtable: include Herbert's "Use irq work for shrinking" patch so
__rhashtable_remove_fast_one() can fire the shrink path from NMI
context (Herbert).
- hashtab: fix u32 multiply overflow in __rhtab_map_lookup_and_delete_batch
copy_to_user; cast total to size_t before multiplying by key_size /
value_size (sashiko, bot+bpf-ci).
- hashtab: allow kptr/refcount fields in rhtab values (same model as
array map).
- Link to v6: https://patch.msgid.link/20260602-rhash-v6-0-1bfd35a4184f@meta.com
Changes in v6:
- rhashtable_next_key: advance past duplicate keys in the main bucket
chain to avoid an infinite loop when there are duplicate keys
(sashiko).
- rhashtable_next_key: return ERR_PTR(-EOPNOTSUPP) on rhltable (sashiko).
- rhashtable: selftest pre-sizes the table to avoid concurrent rehash
triggering spurious failures (sashiko).
- hashtab: real rhtab_map_mem_usage in the basic commit; move
bpf_map_free_internal_structs from rhtab_free_elem into the
special-fields commit where it does meaningful work (bot+bpf-ci).
- bpf_iter (seq_file): switch to rhashtable_walk_* for stronger
coverage under concurrent rehash; get_next_key and batch keep
rhashtable_next_key (sashiko).
- iter ops: rhtab_map_get_next_key adds IS_ERR check
before dereferencing the element pointer (sashiko).
- iter ops: bpf_each_rhash_elem removes cond_resched() (sashiko).
- iter ops: batch returns -EAGAIN (not -ENOENT) on cursor delete,
so userspace can distinguish lost cursor from end-of-iteration
and restart from NULL (sashiko).
- Link to v5: https://patch.msgid.link/20260528-rhash-v5-0-7205191b6c57@meta.com
Changes in v5:
- rhashtable_next_key: add kdoc WARNING to highlight lack of rehash
detection and unbounded iteration (Herbert).
- rhashtable: selftest now checks IS_ERR() before PTR_ERR comparison
on the missing-key path (bot+bpf-ci).
- hashtab: drop dead stub bodies and unused map_ops registrations
from the basic commit; iteration commit adds bodies, structs, and
registrations together. .map_get_next_key keeps a stub registration
in the basic commit because the syscall dispatcher does not
NULL-check it; iteration commit replaces the stub body with the
real implementation (bot+bpf-ci).
- hashtab: fix batch cursor advancement. v4 stashed the lookahead
element key but then resumed via next_key(cursor), skipping that
element across batch boundaries and orphaning it on
lookup_and_delete_batch. v5 stashes the lookahead key and looks
it up directly on the next batch entry (bot+bpf-ci, sashiko v3).
- hashtab: document torn-read race in rhtab_map_update_existing,
matching arraymap semantics (bot+bpf-ci).
- Link to v4: https://patch.msgid.link/20260513-rhash-v4-0-dd3d541ccb0b@meta.com
Changes in v4:
- rhashtable: introduce rhashtable_next_key(), drop walker-based
iteration for BPF (also drops earlier rhashtable_walk_enter_from()
proposal).
- map_extra: presize hint via lower 32 bits (nelem_hint), capped at
U16_MAX.
- Automatic shrinking enabled (was missing despite being advertised).
- Reject key_size > U16_MAX (rhashtable_params.key_len is u16).
- Replace irqs_disabled() guard with bpf_disable_instrumentation around
bucket-lock paths: closes same-CPU NMI tracing recursion without
rejecting legitimate IRQ-context callers.
- lookup_and_delete reordered: unlink before copy to avoid populating
user buffer on concurrent-unlink -ENOENT.
- update_existing reordered: copy then free_fields, matching arraymap.
- Word-sized key fast path (sizeof(long) bytes), inlined hashfn/cmpfn
via static-const rhashtable_params; works on both 32-bit and 64-bit.
- check_and_init_map_value() on insert (zero special-field bytes from
recycled bpf_mem_alloc memory; previously bpf_spin_lock could read
garbage and qspinlock would deadlock).
- BPF_SPIN_LOCK / BPF_RES_SPIN_LOCK allowlist moved to the special-
fields commit so each commit is bisect-safe.
- Link to v3: https://patch.msgid.link/20260424-rhash-v3-0-d0fa0ce4379b@meta.com
Changes in v3:
- Squash all commits implementing basic functions into one (Alexei)
- Remove selftests that were not necessary (Alexei)
- Resize detection for kernel full iterations, error out on resize (Alexei)
- Remove second lookup in get_next_key() (Emil)
- __acquires(RCU)/__releases(RCU) on seq_start/seq_stop (Emil)
- Use bpf_map_check_op_flags() where it makes sense (Leon)
- Benchmarks refresh, experiment with alternative hash functions
- Rely on iterator invalidation during rehash to handle table resizes:
fail on resize where we fully iterate on table inside kernel, dont fail on
resize where iteration goes through userspace. Exception -
rhtab_map_free_internal_structs() should be just safe to iterate fully
in kernel, no risk of infinite loop, because no user holding reference.
- Handle special fields during in-place updates (Emil, sashiko)
- Link to v2: https://lore.kernel.org/all/20260408-rhash-v2-0-3b3675da1f6e@meta.com/
Changes in v2:
- Added benchmarks
- Reworked all functions that walk the rhashtable, use walk API, instead
of directly accessing tbl and future_tbl
- Added rhashtable_walk_enter_from() into rhashtable to support O(1)
iteration continuations
- Link to v1: https://lore.kernel.org/r/20260205-rhash-v1-0-30dd6d63c462@meta.com
---
====================
Link: https://patch.msgid.link/20260605-rhash-v7-0-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Test basic BPF iterator functionality for BPF_MAP_TYPE_RHASH,
verifying all elements are visited.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-10-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Add BPF_MAP_TYPE_RHASH to libbpf's map type name table and feature
probing so that libbpf-based tools can create and identify resizable
hash maps.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-8-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Specialize the lookup/update/delete paths for keys whose size matches
sizeof(long) (4 bytes on 32-bit, 8 bytes on 64-bit). A static-const
rhashtable_params lets the compiler inline a custom XOR-fold hashfn and
a single-word equality cmpfn, eliminating the indirect jhash dispatch.
The same hashfn and cmpfn are installed into rhashtable's stored params
at rhashtable_init time, so the rehash worker, slow-path inserts, and
rhashtable_next_key() all agree with the inlined fast paths.
The seq_file BPF iterator uses rhashtable_walk_* and is unaffected.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-7-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Add support for timers, workqueues, task work, spin locks and kptrs.
Without this, users needing deferred callbacks, BPF_F_LOCK, or
refcounted kernel pointers in a dynamically-sized map have no option -
fixed-size htab is the only map supporting these field types.
Resizable hashtab should offer the same capability.
kptr semantics under in-place updates are identical to array map.
Properly clean up BTF record fields on element delete and map
teardown by wiring up bpf_obj_free_fields through a memory allocator
destructor, matching the pattern used by htab for non-prealloc maps.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-6-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Implement get_next_key, batch lookup/lookup-and-delete, for_each_map_elem
callback, and the seq_file BPF iterator for BPF_MAP_TYPE_RHASH.
get_next_key() and batch use rhashtable_next_key() — stateless,
matches the syscall UAPI shape (no kernel-side iterator state).
get_next_key falls back to the first key when prev_key was
concurrently deleted (matches htab semantics). Batch reports
cursor loss as -EAGAIN so userspace can distinguish it from
end-of-iteration (-ENOENT) and restart from NULL.
The seq_file BPF iterator uses rhashtable_walk_* instead. It runs
only from read() syscall context, so the walker's spin_lock is
safe, and seq_file's per-fd state lets the walker handle rehash
correctly (retry on -EAGAIN) for stronger coverage than the
stateless API can provide.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-5-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Use rhashtable_lookup_likely() for lookups, rhashtable_remove_fast()
for deletes, and rhashtable_lookup_get_insert_fast() for inserts.
Updates modify values in place under RCU rather than allocating a
new element and swapping the pointer (as regular htab does). This
trades read consistency for performance: concurrent readers may
see partial updates. BPF_F_LOCK support and special-field
handling (timers, kptrs, etc.) follow in a later commit.
Initialize rhashtable with bpf_mem_alloc element cache. Require
BPF_F_NO_PREALLOC. Limit max_entries to 2^31. Free elements via
rhashtable_free_and_destroy().
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-4-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Use irq work for automatic shrinking so that this may be called in NMI
context.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://lore.kernel.org/r/20260605-rhash-v7-3-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Insert n elements, then verify:
- NULL prev_key walks from the beginning, visiting all n
- non-existing prev_key returns ERR_PTR(-ENOENT)
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/20260605-rhash-v7-2-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Introduce a simpler iteration mechanism for rhashtable that lets
the caller continue from an arbitrary position by supplying the
previous key, without the per-iterator state of the
rhashtable_walk_* API.
void *rhashtable_next_key(struct rhashtable *ht,
const void *prev_key);
Caller holds RCU; passes NULL prev_key for the first element or
the previously returned key to advance. Walks tbl->future_tbl
chain so in-flight rehashes are observed.
Best-effort: in case of concurrent resize, provides no guarantees:
- may produce duplicate elements
- may skip any amount of elements
- termination of the loop is not guaranteed in case of
sustained rehash. Callers are advised to bound loop externally
or avoid inserting new elements during such loop.
Returns ERR_PTR(-ENOENT) if prev_key is not found.
Behavior on tables with duplicate keys is undefined.
rhltable is not supported — returns ERR_PTR(-EOPNOTSUPP).
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/20260605-rhash-v7-1-5b8e05f8630d@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
When running the selftests on a retbleed-affected platform (eg:
Skylake), with call depth accounting enabled
(CONFIG_CALL_DEPTH_TRACKING=y) _and_ with retbleed=stuff, some verifier
selftests fail to validate the jited instructions. For example:
MATCHED SUBSTR: ' endbr64'
MATCHED SUBSTR: ' nopl (%rax,%rax)'
MATCHED SUBSTR: ' xorq %rax, %rax'
MATCHED SUBSTR: ' pushq %rbp'
MATCHED SUBSTR: ' movq %rsp, %rbp'
MATCHED SUBSTR: ' endbr64'
MATCHED SUBSTR: ' cmpq $0x21, %rax'
MATCHED SUBSTR: ' ja L0'
MATCHED SUBSTR: ' pushq %rax'
MATCHED SUBSTR: ' movq %rsp, %rax'
MATCHED SUBSTR: ' jmp L1'
MATCHED SUBSTR: 'L0: pushq %rax'
MATCHED SUBSTR: 'L1: pushq %rax'
MATCHED SUBSTR: ' movq -0x10(%rbp), %rax'
WRONG LINE REGEX: ' callq 0x{{.*}}'
Those affected selftests allways fail on some call instruction: this
failure is due to the JIT compiler emitting call depth accounting for
retbleed mitigation (see x86_call_depth_emit_accounting calls in
bpf_jit_comp.c), resulting in an additional instruction being inserted
in front of every call instruction, similar to this one:
sarq $0x5, %gs:-0x39882741(%rip)
Fix those selftests by allowing them to ignore this possibly present
call depth accounting instruction.
Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260528-fix_tests_for_retbleed_stuff-v1-1-c2022a1f3bee@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
zap_vma_range() requires the owning mm's mmap_lock to be held.
Taking mmap_read_lock under arena->lock would AB-BA against
arena_vm_close() and arena_map_mmap(), both of which run with
mmap_write_lock held and then acquire arena->lock. Instead drop
arena->lock, mmget_not_zero() the vma's mm, take mmap_read_lock, and
re-resolve the vma via find_vma() since it may have been unmapped or
replaced while waiting.
Track processed vmls with a per-call generation in vml->zap_gen and
serialize zap_pages() callers with a new arena->zap_mutex so
concurrent callers on different uaddr ranges do not mark each other's
vmls processed before the zap is done.
Reported-by: David Hildenbrand <david@kernel.org>
Fixes: 317460317a ("bpf: Introduce bpf_arena.")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260528222014.38980-1-alexei.starovoitov@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Refactor the newly introduced btf_scan_decl_tags() to improve
readability and maintainability. The current implementation uses a
manual if-else chain and a magic number offset to strip the "arg:"
prefix from declaration tags.
Replace the if-else logic with a table-driven approach using a static
const array. This separates the tag data from the scanning logic, making
the helper more extensible for future tags. Additionally, replace the
magic number '4' with a sizeof-based calculation on the prefix string to
ensure the offset remains synchronized with the search key.
Finally, optimize the loop by moving the is_global check to the top of
the block. This allows the verifier to fail-fast on static subprograms
without performing unnecessary BTF string and type lookups.
Signed-off-by: Matt Bobrowski <mattbobrowski@google.com>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260603201822.770596-1-mattbobrowski@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
The positive path for signed BPF loaders is covered today by the
signed lskels (fentry_test, fexit_test, atomics).
But the runtime metadata check the generated loader performs (libbpf
gen_loader's emit_signature_match), the map content hash it relies
on, the load-time signature, and the immutability invariants of its
metadata map are not yet covered.
Thus, add a new, extensive test suite which drives libbpf's gen_loader
(bpf_object__gen_loader, gen_hash=true), the same machinery which
bpftool uses for signed light skeletons, and exercise corner cases
so that we can assert this in BPF CI:
# LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t signed_loader
[...]
[ 1.840842] clocksource: Switched to clocksource tsc
#405/1 signed_loader/metadata_check_shape:OK
#405/2 signed_loader/metadata_match:OK
#405/3 signed_loader/metadata_sha_mismatch:OK
#405/4 signed_loader/metadata_not_exclusive:OK
#405/5 signed_loader/metadata_hash_not_computed:OK
#405/6 signed_loader/signature_enforced:OK
#405/7 signed_loader/signature_too_large:OK
#405/8 signed_loader/signature_bad_keyring:OK
#405/9 signed_loader/metadata_ctx_max_entries_ignored:OK
#405/10 signed_loader/metadata_ctx_initial_value_ignored:OK
#405/11 signed_loader/signature_authenticates_insns:OK
#405/12 signed_loader/hash_requires_frozen:OK
#405/13 signed_loader/no_update_after_freeze:OK
#405/14 signed_loader/freeze_writable_mmap:OK
#405/15 signed_loader/no_writable_mmap_frozen:OK
#405/16 signed_loader/map_hash_matches_libbpf:OK
#405/17 signed_loader/map_hash_multi_element:OK
#405/18 signed_loader/map_hash_bad_size:OK
#405/19 signed_loader/map_hash_unsupported_type:OK
#405 signed_loader:OK
Summary: 1/19 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260603211658.471212-2-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
map_excl exercises exclusive-map binding (allowed/denied), map-in-map
and map iterator rejection. It does not cover the create-time validation
of excl_prog_hash: the kernel only accepts a SHA-256-sized hash and
requires the pointer and size to be consistent.
Add map_excl_create_validation to check the rejected combinations:
# LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t map_excl
[...]
[ 1.780305] clocksource: Switched to clocksource tsc
#215/1 map_excl/map_excl_allowed:OK
#215/2 map_excl/map_excl_denied:OK
#215/3 map_excl/map_excl_no_map_in_map:OK
#215/4 map_excl/map_excl_no_map_iter:OK
#215/5 map_excl/map_excl_create_validation:OK
#215 map_excl:OK
Summary: 1/5 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260603211658.471212-1-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf_prog_query() returns a negative errno on failure.
query_flow_dissector() currently closes the namespace fd and then reads
errno to decide whether -EINVAL means that the running kernel does not
support flow dissector queries.
That errno check controls behavior, not just diagnostics: -EINVAL is
handled as a non-fatal old-kernel case, while any other error makes bpftool
net fail.
The namespace fd is opened read-only, so close() is not expected to
commonly fail in normal use. Still, the BPF_PROG_QUERY error is already
available in err, and reading errno after an intervening close() is
fragile. If close() does change errno, the compatibility branch may be
based on close()'s error instead of the BPF_PROG_QUERY result.
This was reproduced with an LD_PRELOAD fault injector that forced
BPF_PROG_QUERY for BPF_FLOW_DISSECTOR to fail with EINVAL and then
forced close() on the netns fd to fail with EIO. The unpatched bpftool
reported "can't query prog: Input/output error". With this change, the
same injected failure is handled as the intended non-fatal EINVAL
compatibility case.
Use the libbpf-returned error code instead. Keep the existing errno reset
in the non-fatal path to preserve batch mode behavior. The success path
is unchanged.
Fixes: 7f0c57fec8 ("bpftool: show flow_dissector attachment status")
Signed-off-by: Woojin Ji <random6.xyz@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/bpf/20260603003339.33791-1-random6.xyz@gmail.com
Assisted-by: ChatGPT:gpt-5.5
The macro requires callers to pass a stack variable, but not all
callbacks use it. Add (void)__stack to suppress the clang W=1 warning.
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260602175204.624401-1-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Daniel Borkmann says:
====================
More gen_loader fixes#2
Another small follow-up from the sashiko findings about signed loaders.
In particular, closing the gap to reject exclusive maps in iterators.
====================
Link: https://patch.msgid.link/20260602133052.423725-1-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
sashiko complained that 38498c0eba ("selftests/bpf: Adjust verifier_map_ptr
for the map's excl field") would slightly decrease the test coverage given
before the test was against the verifier rejecting the ops pointer. Recover
the old test with the right offsets and add the existing one as an additional
test case.
# LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t verifier_map_ptr
[ 1.672932] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
#637/1 verifier_map_ptr/bpf_map_ptr: read with negative offset rejected:OK
#637/2 verifier_map_ptr/bpf_map_ptr: read with negative offset rejected @unpriv:OK
#637/3 verifier_map_ptr/bpf_map_ptr: write rejected:OK
#637/4 verifier_map_ptr/bpf_map_ptr: write rejected @unpriv:OK
#637/5 verifier_map_ptr/bpf_map_ptr: read non-existent field rejected:OK
#637/6 verifier_map_ptr/bpf_map_ptr: read non-existent field rejected @unpriv:OK
#637/7 verifier_map_ptr/bpf_map_ptr: read beyond excl field rejected:OK
#637/8 verifier_map_ptr/bpf_map_ptr: read beyond excl field rejected @unpriv:OK
#637/9 verifier_map_ptr/bpf_map_ptr: read ops field accepted:OK
#637/10 verifier_map_ptr/bpf_map_ptr: read ops field accepted @unpriv:OK
#637/11 verifier_map_ptr/bpf_map_ptr: r = 0, map_ptr = map_ptr + r:OK
#637/12 verifier_map_ptr/bpf_map_ptr: r = 0, map_ptr = map_ptr + r @unpriv:OK
#637/13 verifier_map_ptr/bpf_map_ptr: r = 0, r = r + map_ptr:OK
#637/14 verifier_map_ptr/bpf_map_ptr: r = 0, r = r + map_ptr @unpriv:OK
#637 verifier_map_ptr:OK
[...]
Summary: 2/20 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260602133052.423725-4-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
add_data() computes size8 = roundup(size, 8) and then hands size8 to
realloc_data_buf() before doing memcpy(gen->data_cur, data, size) with
the original size. A wrapped size8 passes through the realloc_data_buf()
INT32_MAX check. Harden this against overflow, though not realistic to
happen in practice.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260602133052.423725-3-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Exclusive maps (aka excl_prog_hash) are meant to be reachable only
from the single program whose hash matches. This is enforced by
check_map_prog_compatibility() when the map is referenced from a
program such as signed BPF loaders.
A bpf_map_elem iterator, however, binds its target map at attach
time in bpf_iter_attach_map() instead of referencing it from the
program, so the exclusivity check is never reached. On top of that,
the iterator exposes the map value as a writable buffer.
Fixes: baefdbdf68 ("bpf: Implement exclusive map creation")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260602133052.423725-2-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
commit 4f375ade6a ("bpf: Avoid RCU context warning when unpinning
htab with internal structs") moved inode cleanup from ->free_inode()
into ->destroy_inode() to avoid sleeping in RCU context when calling
bpf_any_put(). However this removed the RCU delay on freeing the
inode itself and the cached symlink body (i_link), both of which
can be accessed by RCU pathwalk (pick_link, may_lookup etc.).
This causes a use-after-free when a concurrent unlinkat() drops the
last inode reference and destroy_inode() frees the inode immediately,
while another task is still walking the path in RCU mode and reads
inode->i_opflags (offset +2) inside current_time() -> is_mgtime().
KASAN reports:
BUG: KASAN: slab-use-after-free in is_mgtime include/linux/fs.h:2313
Read of size 2 at addr ffff8880407e4282 (offset +2 = i_opflags)
The rules (per Al Viro):
->destroy_inode() called immediately, can sleep, use for blocking
cleanup e.g. bpf_any_put()
->free_inode() called after RCU grace period, use for freeing
inode and anything RCU-accessible e.g. i_link
Fix: split the two concerns properly:
- keep bpf_any_put() in bpf_destroy_inode() since it is blocking
and needs to run promptly
- introduce bpf_free_inode() to handle kfree(i_link) and
free_inode_nonrcu() with proper RCU delay, preventing the UAF
Fixes: 4f375ade6a ("bpf: Avoid RCU context warning when unpinning htab with internal structs")
Reported-by: syzbot+36e50496c8ac4bcde3f9@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=36e50496c8ac4bcde3f9
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/all/20260423043906.GN3518998@ZenIV/
Link: https://lore.kernel.org/all/20260602002607.110866-1-kartikey406@gmail.com/T/ [v1]
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://lore.kernel.org/r/20260602025249.113828-1-kartikey406@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Emil Tsalapatis says:
====================
Minimize annotations for arena programs
BPF programs must currently include code to address two limitations
of function signatures that include arena types. First, arena arguments
must be annotated with __arg_arena in the function signature in addition
to __arena. Second, it is currently not allowed to return an arena pointer
from a subprog, even though it is safe to do so. These limitations require
extra annotations and typecasts respectively, and have proven sources of
confusion to programmers.
The patchset improves arena-related function signatures in two ways.
First, it removes the need for __arg_arena in function signatures.
Second, it allows subprogs to directly return arena pointers to their
caller.
To do this we add a new type tag to the existing __arena annotation.
The annotation is currently an alias for __attribute__((address_space(1))),
which is not discoverable from BTF alone and so cannot be used to
determine whether a pointer variable is an arena pointer during
verification. With the new type tag, we can determine whether
either the arguments and or the return value of a function belong
in an arena.
We test the new code by modifying libarena to take advantage of these
relaxed limitations.
CHANGELOG
=========
v2 -> v3 (https://lore.kernel.org/bpf/20260530002259.4505-1-emil@etsalapatis.com/)
- Added Acks by Eduard
- Complete the __arg_arena removal by removing them from htab (Alexei)
- Add a test in verifier_arena_globals1.c to confirm the new __arena attribute
works as expected in function argument and return types
- Reject type tags on non-pointer types, currently only possible in handcrafted
BTF (Eduard)
- Undo inaccurate change on verifier comment (AI)
- Fix error return value for invalid BTF return types during BTF parsing (Eduard)
v1 -> v2 (lore.kernel.org/bpf/20260527071457.4598-1-emil@etsalapatis.com/)
- Rebased to fix conflict
- Removed the typedef foo * foo_t typedefs. Those were necessary to avoid
annotating each instance of the type with __arena. The new version of the
patch instead removes typedefs and uses __arena everywhere directly (see
patch 4/5 for more details).
- Reorganized the patchset to frontload all kernel-side changes and place
the libarena changes at the end.
====================
Link: https://patch.msgid.link/20260602004120.17087-1-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Add selftests that combine the new type-based __arena identifier with
the volatile qualifier both in functions' arguments and return values.
This way we test both that they are recognized as arena arguments and
that they are not sensitive to the position they are placed in the type
compared to other qualifiers.
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-7-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Now that the __arena annotation includes a BTF type tag, and the
verifier can identify arena pointers at BTF loading time, return
arena pointers as their true type instead of casting to u64. Remove the
preprocessor typecast wrappers used to hide this from the caller.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-6-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Now that BPF __arg_arena has been subsumed by __arena, remove
__arg_arena from the codebase. This way the user has one fewer
annotation to worry about.
To remove __arg_arena we remove the typedefs we were previously
using to minimize __arena annotations. This is because __arena
now also includes a BTF type tag, which is ignored for non-pointer
types. As a result, we cannot capture the whole __arena annotation
inside a typedef and need to directly annotate the pointer type when
declaring the variable.
The extra verbosity is worth it because the use of the __arena tag
is intuitive to the programmer and removes the __arg_arena tag that
has been a consistent source of confusion for users. The typedefs
can be reintroduced later (without __arg_arena) once compilers start
supporting BTF type tags for non-pointer types.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-5-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
BPF subprogs currently only return void or scalar values. However,
it is also safe to return arena pointers between subprogs in the same
BPF program: Arena pointers are guaranteed to be safe for both programs
at any point. Expand the verifier to permit returning an arena pointer
to the caller.
The main subprog is still not allowed to return an arena pointer because
arena pointers are internal to the BPF program, and the return values
permitted for each main subprog depend on the program type anyway.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-4-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
The BTF parsing logic for function arguments goes through
the arguments' decl tags, but does not go into their type
tags. Add type tag parsing for function arguments.
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-3-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
The arena qualifier currently designates its associated type
as belonging to address space 1. This property affects code
generation, but is not reflected in the BTF information of
the function.
This lack of information at the BTF level prevents us from
returning arena pointers from global subprograms. Subprogs
cannot return any data structure more complex than a scalar,
so pointers to structs are rejected as a return type. We
have no way of marking the return type as a pointer to an
arena, which is safe provided the two subprogs have the same
arena.
Expand the __arena qualifier to also attach a BTF type tag
to the type. This lets us determine whether a variable belongs
to an arena from its type alone through BTF parsing.
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/r/20260602004120.17087-2-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Daniel Borkmann says:
====================
More gen_loader fixes
Follow-up fixes for the signed loader, includes also the recent
sashiko findings.
v1->v2:
- Fixed up verifier_map_ptr selftest
- Added patch 1/2/6/7 with a new map-in-map fix and a
redundant hash_buf memcpy cleanup as well as selftests
====================
Link: https://patch.msgid.link/20260601150248.394863-1-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf_gen__map_create() lets the host-supplied loader ctx override a
map's max_entries at runtime (map_desc[idx].max_entries, when non-zero).
This is how the light skeleton sizes maps to the target machine, but
it happens after emit_signature_match() and is covered by neither the
signed loader instructions nor the hashed blob.
For a signed loader this means an untrusted host can re-dimension the
program's maps, outside what the signature attests to. Gate the override
on gen_hash so signed loaders use the signer-provided max_entries baked
into the blob.
Fixes: ea923080c1 ("libbpf: Embed and verify the metadata hash in the loader")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260601150248.394863-6-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
