Context |
Check |
Description |
netdev/series_format |
success
|
Posting correctly formatted
|
netdev/codegen |
success
|
Generated files up to date
|
netdev/tree_selection |
success
|
Clearly marked for bpf, async
|
netdev/fixes_present |
success
|
Fixes tag present in non-next series
|
netdev/header_inline |
success
|
No static functions without inline keyword in header files
|
netdev/build_32bit |
success
|
Errors and warnings before: 1120 this patch: 1120
|
netdev/cc_maintainers |
warning
|
4 maintainers not CCed: song@kernel.org yonghong.song@linux.dev kpsingh@kernel.org martin.lau@linux.dev
|
netdev/build_clang |
success
|
Errors and warnings before: 1143 this patch: 1143
|
netdev/verify_signedoff |
success
|
Signed-off-by tag matches author and committer
|
netdev/deprecated_api |
success
|
None detected
|
netdev/check_selftest |
success
|
No net selftest shell script
|
netdev/verify_fixes |
success
|
Fixes tag looks correct
|
netdev/build_allmodconfig_warn |
success
|
Errors and warnings before: 1147 this patch: 1147
|
netdev/checkpatch |
warning
|
WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
WARNING: line length of 81 exceeds 80 columns
WARNING: line length of 83 exceeds 80 columns
WARNING: line length of 84 exceeds 80 columns
|
netdev/build_clang_rust |
success
|
No Rust files in patch. Skipping build
|
netdev/kdoc |
success
|
Errors and warnings before: 0 this patch: 0
|
netdev/source_inline |
success
|
Was 0 now: 0
|
bpf/vmtest-bpf-PR |
fail
|
PR summary
|
bpf/vmtest-bpf-VM_Test-0 |
success
|
Logs for Lint
|
bpf/vmtest-bpf-VM_Test-1 |
success
|
Logs for ShellCheck
|
bpf/vmtest-bpf-VM_Test-2 |
success
|
Logs for Validate matrix.py
|
bpf/vmtest-bpf-VM_Test-8 |
success
|
Logs for aarch64-gcc / veristat
|
bpf/vmtest-bpf-VM_Test-3 |
success
|
Logs for aarch64-gcc / build / build for aarch64 with gcc
|
bpf/vmtest-bpf-VM_Test-4 |
success
|
Logs for aarch64-gcc / test (test_maps, false, 360) / test_maps on aarch64 with gcc
|
bpf/vmtest-bpf-VM_Test-7 |
success
|
Logs for aarch64-gcc / test (test_verifier, false, 360) / test_verifier on aarch64 with gcc
|
bpf/vmtest-bpf-VM_Test-9 |
success
|
Logs for s390x-gcc / build / build for s390x with gcc
|
bpf/vmtest-bpf-VM_Test-17 |
success
|
Logs for x86_64-gcc / test (test_maps, false, 360) / test_maps on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-19 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-15 |
success
|
Logs for set-matrix
|
bpf/vmtest-bpf-VM_Test-23 |
success
|
Logs for x86_64-gcc / veristat / veristat on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-26 |
success
|
Logs for x86_64-llvm-16 / test (test_progs, false, 360) / test_progs on x86_64 with llvm-16
|
bpf/vmtest-bpf-VM_Test-25 |
success
|
Logs for x86_64-llvm-16 / test (test_maps, false, 360) / test_maps on x86_64 with llvm-16
|
bpf/vmtest-bpf-VM_Test-21 |
success
|
Logs for x86_64-gcc / test (test_progs_parallel, true, 30) / test_progs_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-14 |
success
|
Logs for s390x-gcc / veristat
|
bpf/vmtest-bpf-VM_Test-27 |
success
|
Logs for x86_64-llvm-16 / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with llvm-16
|
bpf/vmtest-bpf-VM_Test-20 |
success
|
Logs for x86_64-gcc / test (test_progs_no_alu32_parallel, true, 30) / test_progs_no_alu32_parallel on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-18 |
fail
|
Logs for x86_64-gcc / test (test_progs, false, 360) / test_progs on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-16 |
success
|
Logs for x86_64-gcc / build / build for x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-24 |
success
|
Logs for x86_64-llvm-16 / build / build for x86_64 with llvm-16
|
bpf/vmtest-bpf-VM_Test-22 |
success
|
Logs for x86_64-gcc / test (test_verifier, false, 360) / test_verifier on x86_64 with gcc
|
bpf/vmtest-bpf-VM_Test-29 |
success
|
Logs for x86_64-llvm-16 / veristat
|
bpf/vmtest-bpf-VM_Test-28 |
success
|
Logs for x86_64-llvm-16 / test (test_verifier, false, 360) / test_verifier on x86_64 with llvm-16
|
bpf/vmtest-bpf-VM_Test-6 |
success
|
Logs for aarch64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on aarch64 with gcc
|
bpf/vmtest-bpf-VM_Test-5 |
success
|
Logs for aarch64-gcc / test (test_progs, false, 360) / test_progs on aarch64 with gcc
|
bpf/vmtest-bpf-VM_Test-13 |
success
|
Logs for s390x-gcc / test (test_verifier, false, 360) / test_verifier on s390x with gcc
|
bpf/vmtest-bpf-VM_Test-12 |
success
|
Logs for s390x-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on s390x with gcc
|
bpf/vmtest-bpf-VM_Test-11 |
success
|
Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc
|
bpf/vmtest-bpf-VM_Test-10 |
fail
|
Logs for s390x-gcc / test (test_maps, false, 360) / test_maps on s390x with gcc
|
@@ -1044,20 +1044,11 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
* activated, so tail call updates can arrive from here
* while JIT is still finishing its final fixup for
* non-activated poke entries.
- * 3) On program teardown, the program's kallsym entry gets
- * removed out of RCU callback, but we can only untrack
- * from sleepable context, therefore bpf_arch_text_poke()
- * might not see that this is in BPF text section and
- * bails out with -EINVAL. As these are unreachable since
- * RCU grace period already passed, we simply skip them.
- * 4) Also programs reaching refcount of zero while patching
+ * 3) Also programs reaching refcount of zero while patching
* is in progress is okay since we're protected under
* poke_mutex and untrack the programs before the JIT
- * buffer is freed. When we're still in the middle of
- * patching and suddenly kallsyms entry of the program
- * gets evicted, we just skip the rest which is fine due
- * to point 3).
- * 5) Any other error happening below from bpf_arch_text_poke()
+ * buffer is freed.
+ * 4) Any error happening below from bpf_arch_text_poke()
* is a unexpected bug.
*/
if (!READ_ONCE(poke->tailcall_target_stable))
@@ -1075,21 +1066,21 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
if (new) {
ret = bpf_arch_text_poke(poke->tailcall_target,
BPF_MOD_JUMP,
- old_addr, new_addr, true);
- BUG_ON(ret < 0 && ret != -EINVAL);
+ old_addr, new_addr, false);
+ BUG_ON(ret < 0);
if (!old) {
ret = bpf_arch_text_poke(poke->tailcall_bypass,
BPF_MOD_JUMP,
poke->bypass_addr,
- NULL, true);
- BUG_ON(ret < 0 && ret != -EINVAL);
+ NULL, false);
+ BUG_ON(ret < 0);
}
} else {
ret = bpf_arch_text_poke(poke->tailcall_bypass,
BPF_MOD_JUMP,
old_bypass_addr,
- poke->bypass_addr, true);
- BUG_ON(ret < 0 && ret != -EINVAL);
+ poke->bypass_addr, false);
+ BUG_ON(ret < 0);
/* let other CPUs finish the execution of program
* so that it will not possible to expose them
* to invalid nop, stack unwind, nop state
@@ -1098,8 +1089,8 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
synchronize_rcu();
ret = bpf_arch_text_poke(poke->tailcall_target,
BPF_MOD_JUMP,
- old_addr, NULL, true);
- BUG_ON(ret < 0 && ret != -EINVAL);
+ old_addr, NULL, false);
+ BUG_ON(ret < 0);
}
}
}
Lee pointed out issue found by syscaller [0] hitting BUG in prog array map poke update in prog_array_map_poke_run function due to error value returned from bpf_arch_text_poke function. There's race window where bpf_arch_text_poke can fail due to missing bpf program kallsym symbols, which is accounted for with check for -EINVAL in that BUG_ON call. The problem is that in such case we won't update the tail call jump and cause imballance for the next tail call update check which will fail with -EBUSY in bpf_arch_text_poke. I'm hitting following race during the program load: CPU 0 CPU 1 bpf_prog_load bpf_check do_misc_fixups prog_array_map_poke_track map_update_elem bpf_fd_array_map_update_elem prog_array_map_poke_run bpf_arch_text_poke returns -EINVAL bpf_prog_kallsyms_add After bpf_arch_text_poke (CPU 1) fails to update the tail call jump, the next poke update fails on expected jump instruction check in bpf_arch_text_poke with -EBUSY and triggers the BUG_ON in prog_array_map_poke_run. Similar race exists on the program unload. Fixing this by calling bpf_arch_text_poke with 'checkip=false' to skip the bpf symbol check like we do in bpf_tail_call_direct_fixup. This way the prog_array_map_poke_run does not depend on bpf program having the kallsym symbol in place. [0] https://syzkaller.appspot.com/bug?extid=97a4fe20470e9bc30810 Cc: Lee Jones <lee@kernel.org> Cc: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Fixes: ebf7d1f508a7 ("bpf, x64: rework pro/epilogue and tailcall handling in JIT") Reported-by: syzbot+97a4fe20470e9bc30810@syzkaller.appspotmail.com Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- kernel/bpf/arraymap.c | 31 +++++++++++-------------------- 1 file changed, 11 insertions(+), 20 deletions(-)