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Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Pull bpf fixes from Alexei Starovoitov:
- Remove BPF_F_ARENA_SCALAR flag and .arena.data section in libbpf that
were added for rust-bpf in this merge window. We found a cleaner
approach that does it on compiler side instead of kernel/libbpf. No
released kernel has them (Alexei Starovoitov)
- Fix bpf_send_signal_task() returning -EPERM when it is called from a
kernel thread (Aditya Sharma)
- Various fixes (Alexei Starovoitov):
- Use emit_rsb_call() to call bpf_unwind_target() in x86 JIT to fix
objtool warning during the build
- Fix scalar evolution: clear delta of a widened register, don't
widen a pointer to a buffer, don't clamp a register whose type
changed in the loop, and reset the range of a clamped packet
pointer
- Finish the insn in the state that maybe_fork_scalars() splits
off, so that pruning doesn't drop it at the head of a counted
loop
- Preserve the registers that carry stack arguments across
arch_bpf_timed_may_goto() on x86-64, arm64 and riscv64
- Don't re-sort subprog_info[] for every new subprogram
- Fix flaky map_kptr and rcu_reentry selftests
- Use memmove() in bpf_skb_load_bytes(), bpf_skb_load_bytes_relative()
and bpf_xdp_load_bytes(), since the destination can be a slice of the
same packet (Ayushman Rout)
- Fixes and follow-ups for scalar evolution: reject pointer operands in
32-bit recurrences and latches, don't intersect with the current
register range on clamp to avoid a false 'verifier bug', avoid false
infinite loop reports, and recognize a 32-bit copy of the induction
variable (Eduard Zingerman)
- Fix out-of-bounds write to btf->types[] for split BTF and propagate
btf_add_type() errors in btf_check_all_metas() (Feng Yang)
- Fix use-after-free in bpf_timer callback that fires after its inner
map was freed (Mani Tofigh)
- Fix x86 JIT stopping before jumps converge: size backward jumps by
the insns they jump over (Mykyta Yatsenko)
- Fix use-after-free of struct_ops trampoline: dissociate struct_ops
progs before the grace period of the map (Qiliang Yuan)
- Validate stack argument reads against the caller state to fix
out-of-bounds read in the verifier, and reject callbacks with stack
arguments (Weiming Shi)
- Tie borrowed iterator results and pointers loaded from trusted fields
to the lifetime of their source, so that iterator next, destroy and
reference release invalidate them (Xu Yunxiang)
* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: (48 commits)
bpf: Don't re-sort subprog_info[] for every new subprogram
bpf: Fix out-of-bounds btf->types write for split BTF
selftests/bpf: Test stack arguments across may_goto
bpf: Keep stack arguments in arch_bpf_timed_may_goto()
selftests/bpf: Test maybe_fork_scalars() at the head of a counted loop
bpf: Finish the insn in the state that maybe_fork_scalars() splits off
selftests/bpf: Test the clamp of pointers in scalar evolution
bpf: Reset the range of a packet pointer that scalar evolution clamps
bpf: Don't clamp a register whose type changed in the loop
selftests/bpf: Test a loop that moves a pointer to a buffer
bpf: Don't widen a pointer to a buffer in scalar evolution
selftests/bpf: Avoid a page fault in rcu_reentry while the handler is armed
selftests/bpf: Wait for the last maps of map_kptr to be freed
selftests/bpf: Test that a widened register is not linked
bpf: Clear delta of a register that scalar evolution widens
bpf, x86: Remove r0_on_stack from fetching atomics in arena
bpf: Remove BPF_F_ARENA_SCALAR
selftests/bpf: Remove tests for arena access through numbers
libbpf: Keep format strings of bpf_printk() in .rodata
libbpf: Remove .arena.data
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