Lorenz Bauer 2e2713ae1a btf: Fix virt_to_phys() on arm64 when mmapping BTF ...

Breno Leitao reports that arm64 emits the following warning
with CONFIG_DEBUG_VIRTUAL:

    [   58.896157] virt_to_phys used for non-linear address: 000000009fea9737
      (__start_BTF+0x0/0x685530)
    [   23.988669] WARNING: CPU: 25 PID: 1442 at arch/arm64/mm/physaddr.c:15
      __virt_to_phys (arch/arm64/mm/physaddr.c:?)

        ...

    [   24.075371] Tainted: [E]=UNSIGNED_MODULE, [N]=TEST
    [   24.080276] Hardware name: Quanta S7GM 20S7GCU0010/S7G MB (CG1), BIOS 3D22
      07/03/2024
    [   24.088295] pstate: 63400009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
    [   24.098440] pc : __virt_to_phys (arch/arm64/mm/physaddr.c:?)
    [   24.105398] lr : __virt_to_phys (arch/arm64/mm/physaddr.c:?)

	...

    [   24.197257] Call trace:
    [   24.199761] __virt_to_phys (arch/arm64/mm/physaddr.c:?) (P)
    [   24.206883] btf_sysfs_vmlinux_mmap (kernel/bpf/sysfs_btf.c:27)
    [   24.214264] sysfs_kf_bin_mmap (fs/sysfs/file.c:179)
    [   24.218536] kernfs_fop_mmap (fs/kernfs/file.c:462)
    [   24.222461] mmap_region (./include/linux/fs.h:? mm/internal.h:167
       mm/vma.c:2405 mm/vma.c:2467 mm/vma.c:2622 mm/vma.c:2692)

It seems that the memory layout on arm64 maps the kernel image in vmalloc space
which is different than x86. This makes virt_to_phys emit the warning.

Fix this by translating the address using __pa_symbol as suggested by
Breno instead.

Reported-by: Breno Leitao <leitao@debian.org>
Closes: https://lore.kernel.org/bpf/g2gqhkunbu43awrofzqb4cs4sxkxg2i4eud6p4qziwrdh67q4g@mtw3d3aqfgmb/
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Tested-by: Breno Leitao <leitao@debian>
Fixes: a539e2a6d5 ("btf: Allow mmap of vmlinux btf")
Link: https://lore.kernel.org/r/20250717-vmlinux-mmap-pa-symbol-v1-1-970be6681158@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

2025-07-17 11:33:52 -07:00

..

preload

bpf: Add namespace to BPF internal symbols

2025-04-25 09:21:23 -07:00

arena.c

Merge tag 'bpf_try_alloc_pages' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2025-03-30 13:45:28 -07:00

arraymap.c

bpf: Remove migrate_{disable|enable} in ->map_for_each_callback

2025-01-08 18:06:35 -08:00

bloom_filter.c

bpf: Check bloom filter map value size

2024-03-27 09:56:17 -07:00

bpf_cgrp_storage.c

bpf: Only fails the busy counter check in bpf_cgrp_storage_get if it creates storage

2025-03-18 19:05:46 -07:00

bpf_inode_storage.c

bpf: Disable migration when destroying inode storage

2025-01-08 18:06:36 -08:00

bpf_iter.c

bpf: Make every prog keep a copy of ctx_arg_info

2025-02-17 18:47:27 -08:00

bpf_local_storage.c

bpf: Remove migrate_{disable|enable} from bpf_selem_free()

2025-01-08 18:06:37 -08:00

bpf_lru_list.c

bpf: Adjust free target to avoid global starvation of LRU map

2025-06-18 18:50:14 -07:00

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: Pass the same orig_call value to trampoline functions

2025-05-14 17:48:57 -07:00

bpf_task_storage.c

bpf: Remove migrate_{disable|enable} from bpf_task_storage_lock helpers

2025-01-08 18:06:36 -08:00

btf_iter.c

bpf: Remove custom build rule

2024-08-30 08:55:26 -07:00

btf_relocate.c

bpf: Remove custom build rule

2024-08-30 08:55:26 -07:00

btf.c

Merge tag 'bpf-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2025-05-28 15:52:42 -07:00

cgroup_iter.c

…

cgroup.c

bpf: Specify access type of bpf_sysctl_get_name args

2025-06-23 21:50:44 -07:00

core.c

bpf: Avoid __bpf_prog_ret0_warn when jit fails

2025-05-27 10:43:10 -07:00

cpumap.c

bpf: cpumap: switch to napi_skb_cache_get_bulk()

2025-02-27 14:03:39 +01:00

cpumask.c

bpf: fix missing kdoc string fields in cpumask.c

2025-03-15 11:48:57 -07:00

crypto.c

bpf: crypto: make state and IV dynptr nullable

2024-06-13 16:33:04 -07:00

devmap.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2024-12-12 14:19:05 -08:00

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: Add open coded dmabuf iterator

2025-05-27 09:51:25 -07:00

hashtab.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf after rc4

2025-04-28 08:40:45 -07:00

helpers.c

bpf: Reject %p% format string in bprintf-like helpers

2025-07-01 15:22:46 -07:00

inode.c

VFS: rename lookup_one_len family to lookup_noperm and remove permission check

2025-04-08 11:24:36 +02:00

Kconfig

bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of

2024-05-14 00:36:29 -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

…

local_storage.c

bpf: Replace 8 seq_puts() calls by seq_putc() calls

2024-07-29 12:53:00 -07:00

log.c

bpf: Introduce support for bpf_local_irq_{save,restore}

2024-12-04 08:38:29 -08:00

lpm_trie.c

bpf: Convert lpm_trie.c to rqspinlock

2025-03-19 08:03:05 -07:00

Makefile

bpf: Add dmabuf iterator

2025-05-27 09:51:25 -07:00

map_in_map.c

bpf: switch maps to CLASS(fd, ...)

2024-08-13 15:58:17 -07:00

map_in_map.h

…

map_iter.c

…

memalloc.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

2024-11-13 12:52:51 -08:00

mmap_unlock_work.h

…

mprog.c

…

net_namespace.c

…

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

…

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

bpf: Remove custom build rule

2024-08-30 08:55:26 -07:00

reuseport_array.c

bpf: Use sockfd_put() helper

2024-08-30 08:57:47 -07:00

ringbuf.c

bpf: Convert ringbuf map to rqspinlock

2025-04-11 10:28:26 -07:00

rqspinlock.c

bpf: Use architecture provided res_smp_cond_load_acquire

2025-04-10 12:47:07 -07:00

rqspinlock.h

rqspinlock: Protect waiters in queue from stalls

2025-03-19 08:03:05 -07:00

stackmap.c

bpf: wire up sleepable bpf_get_stack() and bpf_get_task_stack() helpers

2024-09-11 09:58:31 -07:00

syscall.c

Merge tag 'mm-stable-2025-05-31-14-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-05-31 15:44:16 -07:00

sysfs_btf.c

btf: Fix virt_to_phys() on arm64 when mmapping BTF

2025-07-17 11:33:52 -07:00

task_iter.c

Merge tag 'vfs-6.13.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

2024-11-18 10:30:29 -08:00

tcx.c

…

tnum.c

…

token.c

remove pointless includes of <linux/fdtable.h>

2024-10-07 13:34:41 -04:00

trampoline.c

bpf: Add kernel symbol for struct_ops trampoline

2024-11-12 17:13:46 -08:00

verifier.c

bpf: Mark dentry->d_inode as trusted_or_null

2025-06-17 08:40:59 -07:00