"Couldn't read header of a name subsection" when loading wasm-file

[lwagner94]

Hey there,

I'm trying to load the attached simple_add_c.zip (zipped, because github won't allow me to attach wasm-files) .wasm file, but I'm getting the following error:
Error: Couldn't read header of a name subsection

This is how I attempt to load the file:

    let wasm = std::fs::read(&args[1])?;
    let obj_file = object::File::parse(wasm.as_slice())?;

Is this a bug or am I doing something wrong here?

wasm-objdump gives me the following output:

...
imple_add_c.wasm:	file format wasm 0x1

Contents of section Type:
000000a: 0460 017f 0060 0000 6002 7f7f 017f 6000  .`...`..`.....`.
000001a: 017f                                     ..

Contents of section Import:
000001e: 0116 7761 7369 5f73 6e61 7073 686f 745f  ..wasi_snapshot_
000002e: 7072 6576 6965 7731 0970 726f 635f 6578  preview1.proc_ex
000003e: 6974 0000                                it..

Contents of section Function:
0000044: 0901 0203 0001 0100 0102                 ..........

Contents of section Table:
0000050: 0170 0101 01                             .p...

Contents of section Memory:
0000057: 0100 02                                  ...

Contents of section Global:
000005c: 017f 0141 8088 040b                      ...A....

Contents of section Export:
0000066: 0306 6d65 6d6f 7279 0200 065f 7374 6172  ..memory..._star
0000076: 7400 0803 6164 6400 09                   t...add..

Contents of section Code:
0000081: 091b 0101 7f02 4010 8380 8080 0022 0045  ......@......".E
0000091: 0d00 2000 1087 8080 8000 000b 0b07 0020  .. ............ 
00000a1: 0120 006a 0b04 0041 030b 0b00 2000 1080  . .j...A.... ...
00000b1: 8080 8000 000b 0200 0b0e 0010 8580 8080  ................
00000c1: 0010 8580 8080 000b 1700 1085 8080 8000  ................
00000d1: 1085 8080 8000 2000 1084 8080 8000 000b  ...... .........
00000e1: 0600 1001 1006 0b0a 0020 0020 0110 0210  ......... . ....
00000f1: 060b                                     ..

Contents of section Custom:
00000f6: 046e 616d 6501 8301 0a00 105f 5f77 6173  .name......__was
0000106: 695f 7072 6f63 5f65 7869 7401 065f 7374  i_proc_exit.._st
0000116: 6172 7402 0361 6464 030f 5f5f 6f72 6967  art..add..__orig
0000126: 696e 616c 5f6d 6169 6e04 055f 4578 6974  inal_main.._Exit
0000136: 0505 6475 6d6d 7906 115f 5f77 6173 6d5f  ..dummy..__wasm_
0000146: 6361 6c6c 5f64 746f 7273 0704 6578 6974  call_dtors..exit
0000156: 0815 5f73 7461 7274 2e63 6f6d 6d61 6e64  .._start.command
0000166: 5f65 7870 6f72 7409 1261 6464 2e63 6f6d  _export..add.com
0000176: 6d61 6e64 5f65 7870 6f72 7407 1201 000f  mand_export.....
0000186: 5f5f 7374 6163 6b5f 706f 696e 7465 72    __stack_pointer

Contents of section Custom:
0000197: 0970 726f 6475 6365 7273 010c 7072 6f63  .producers..proc
00001a7: 6573 7365 642d 6279 0105 636c 616e 6756  essed-by..clangV
00001b7: 3131 2e30 2e30 2028 6874 7470 733a 2f2f  11.0.0 (https://
00001c7: 6769 7468 7562 2e63 6f6d 2f6c 6c76 6d2f  github.com/llvm/
00001d7: 6c6c 766d 2d70 726f 6a65 6374 2031 3736  llvm-project 176
00001e7: 3234 3962 6436 3733 3261 3830 3434 6434  249bd6732a8044d4
00001f7: 3537 3039 3265 6439 3332 3736 3837 3234  57092ed932768724
0000207: 6136 6630 3629 

[philipc]

Probably the wasm format has changed, and the wasmparser dependency needs updating. The wasm support in this crate is unmaintained, so PRs to update it are welcome.