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exercism / x86-64-assembly

Exercism exercises in x86-64 Assembly.
https://exercism.org/tracks/x86-64-assembly
MIT License
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resistor-color: example solution crashes #171

Closed sudhackar closed 1 year ago

sudhackar commented 1 year ago

https://github.com/exercism/x86-64-assembly/blob/5720b20beeed5518d8637d66538cb096c3bed280/exercises/practice/resistor-color/.meta/example.asm#L15

For the color_array array you'll need to do_relocs - since the members are actually references to other places in the binary.

See musl ld source as the test runner is actually alpine

You'll get a crash when loading the test binary on alpine but maybe not on your machine. The crash looks like

0x7fb81021808c <do_relocs+739>  mov    QWORD PTR [r12], rcx

where r12 is the address for color_array

$r12   : 0x00555ace6500bb  →  <color_array+0>

and rcx is the relocated address of the first member of this array

$rcx   : 0x00555ace650080  →  0x7262006b63616c62 ("black"?)

Ideally the musl libc should change protections for this section(.rodata) or check if its writable - but it doesn't and hence crashes while writing to a readable section of memory

gef➤  vmmap 0x00555ace6500bb
[ Legend:  Code | Heap | Stack ]
Start              End                Offset             Perm Path
0x00555ace650000 0x00555ace651000 0x00000000004000 r-- /tmp/test/exercises/practice/resistor-color/tests

TLDR : Any variable that is actually a reference to another for our submissions should be in .data instead of .rodata due to a weird behaviour of the alpine linux's musl loader - maybe should be reported upstream?

To debug the crash I built the test-runner docker with this diff

diff --git a/Dockerfile b/Dockerfile
index 2eb47d7..5bc1f98 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 FROM alpine:3.10
-RUN apk add --no-cache coreutils gcc libc-dev make nasm python3
+RUN apk add --no-cache coreutils gcc libc-dev make nasm python3 gdb file musl-dbg
+RUN sh -c "$(wget https://gef.blah.cat/sh -O -)"
 WORKDIR /opt/test-runner
 COPY run.sh bin/
 COPY process_results.py ./

Crash with more context

$rax   : 0x0
$rbx   : 0x8
$rcx   : 0x0055eea43d1080  →  0x7262006b63616c62 ("black"?)
$rdx   : 0x0
$rsp   : 0x007ffcf3236a00  →  0x0000000000000000
$rbp   : 0x007fe6bfdafb40  →  0x007fe6bfd1f000  →  0x00010102464c457f
$rsi   : 0x007fe6bfdaf8a0  →  0x0055eea43cd000  →   jg 0x55eea43cd047
$rdi   : 0x007fe6bfdaf8a0  →  0x0055eea43cd000  →   jg 0x55eea43cd047
$rip   : 0x007fe6bfd7608c  →  <do_relocs+739> mov QWORD PTR [r12], rcx
$r8    : 0x007fe6bfd2eaa0  →  0x0800120000094c ("L\t"?)
$r9    : 0x0055eea43d10bb  →  <color_array+0> add BYTE PTR [rax+0x0], 0x0
$r10   : 0x0055eea43cd452  →  "__libc_start_main"
$r11   : 0x0
$r12   : 0x0055eea43d10bb  →  <color_array+0> add BYTE PTR [rax+0x0], 0x0
$r13   : 0x0
$r14   : 0x007fe6bfdaf8a0  →  0x0055eea43cd000  →   jg 0x55eea43cd047
$r15   : 0x0055eea43cd4c8  →   mov ebx, 0x40
$eflags: [zero carry parity adjust sign trap INTERRUPT direction overflow RESUME virtualx86 identification]
$cs: 0x33 $ss: 0x2b $ds: 0x00 $es: 0x00 $fs: 0x00 $gs: 0x00
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── stack ────
0x007ffcf3236a00│+0x0000: 0x0000000000000000     ← $rsp
0x007ffcf3236a08│+0x0008: 0x0000000000000003
0x007ffcf3236a10│+0x0010: 0x0000000000000018
0x007ffcf3236a18│+0x0018: 0x0000000000000000
0x007ffcf3236a20│+0x0020: 0x0000000000000000
0x007ffcf3236a28│+0x0028: 0x0000000000000180
0x007ffcf3236a30│+0x0030: 0x0055eea43cd000  →   jg 0x55eea43cd047
0x007ffcf3236a38│+0x0038: 0x0055eea43cd2c0  →   add BYTE PTR [rax], al
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── code:x86:64 ────
   0x7fe6bfd76080 <do_relocs+727>  jmp    0x7fe6bfd7608c <do_relocs+739>
   0x7fe6bfd76082 <do_relocs+729>  add    rcx, rdx
   0x7fe6bfd76085 <do_relocs+732>  sub    rcx, QWORD PTR [rsi+0x110]
 → 0x7fe6bfd7608c <do_relocs+739>  mov    QWORD PTR [r12], rcx
   0x7fe6bfd76090 <do_relocs+743>  jmp    0x7fe6bfd7618a <do_relocs+993>
   0x7fe6bfd76095 <do_relocs+748>  cmp    QWORD PTR [rsp+0x8], 0x2
   0x7fe6bfd7609b <do_relocs+754>  jne    0x7fe6bfd760a2 <do_relocs+761>
   0x7fe6bfd7609d <do_relocs+756>  mov    rcx, QWORD PTR [r12+0x8]
   0x7fe6bfd760a2 <do_relocs+761>  cmp    DWORD PTR [rip+0x3a1ab], 0x0        # 0x7fe6bfdb0254 <runtime>
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "tests", stopped 0x7fe6bfd7608c in do_relocs (), reason: SIGSEGV
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x7fe6bfd7608c → do_relocs(dso=0x7fe6bfdaf8a0 <app>, rel=0x55eea43cd4c8, rel_size=0x180, stride=0x3)
[#1] 0x7fe6bfd76bde → reloc_all(p=0x7fe6bfdaf8a0 <app>)
[#2] 0x7fe6bfd7838a → __dls3(sp=0x7ffcf3236e80)
[#3] 0x7fe6bfd77ba7 → __dls2b(sp=0x7ffcf3236e80)
[#4] 0x7fe6bfd77b4c → __dls2(base=<optimized out>, sp=0x7ffcf3236e80)
[#5] 0x7fe6bfd75750 → _dlstart()
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
gef➤

It is to note that the glibc's ld implementation does actually change(mprotect) the permissions to writable and then relocates here

if (__mprotect (newp->start, newp->len, newp->prot|PROT_WRITE) < 0)
          {
        errstring = N_("cannot make segment writable for relocation");
          call_error:
        _dl_signal_error (errno, l->l_name, NULL, errstring);
          }
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You can use [this link](https://forum.exercism.org/new-topic?title=resistor-color:%20example%20solution%20crashes&body=https://github.com/exercism/x86-64-assembly/blob/5720b20beeed5518d8637d66538cb096c3bed280/exercises/practice/resistor-color/.meta/example.asm#L15%0D%0A%0D%0AFor%20the%20%60color_array%60%20array%20you'll%20need%20to%20%60do_relocs%60%20-%20since%20the%20members%20are%20actually%20references%20to%20other%20places%20in%20the%20binary.%0D%0A%0D%0ASee%20%5Bmusl%20ld%20source%5D(https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c#n379)%20as%20the%20test%20runner%20is%20actually%20%5Balpine%5D(https://github.com/exercism/x86-64-assembly-test-runner/blob/main/Dockerfile#L1)%20%0D%0A%0D%0AYou'll%20get%20a%20crash%20when%20loading%20the%20test%20binary%20on%20alpine%20but%20maybe%20not%20on%20your%20machine.%20The%20crash%20looks%20like%0D%0A%60%60%60%0D%0A0x7fb81021808c%20%3Cdo_relocs+739%3E%20%20mov%20%20%20%20QWORD%20PTR%20%5Br12%5D,%20rcx%0D%0A%60%60%60%0D%0Awhere%20r12%20is%20the%20address%20for%20%60color_array%60%0D%0A%60%60%60%0D%0A$r12%20%20%20:%200x00555ace6500bb%20%20%E2%86%92%20%20%3Call+0%3E%0D%0A%60%60%60%0D%0Aand%20rcx%20is%20the%20relocated%20address%20of%20the%20first%20member%20of%20this%20array%0D%0A%60%60%60%0D%0A$rcx%20%20%20:%200x00555ace650080%20%20%E2%86%92%20%200x7262006b63616c62%20(%22black%22?)%0D%0A%60%60%60%0D%0A%0D%0AIdeally%20the%20musl%20libc%20should%20change%20protections%20for%20this%20section(.rodata)%20or%20check%20if%20its%20writable%20-%20but%20it%20doesn't%20and%20hence%20crashes%20while%20writing%20to%20a%20readable%20section%20of%20memory%0D%0A%60%60%60%0D%0Agef%E2%9E%A4%20%20vmmap%200x00555ace6500bb%0D%0A%5B%20Legend:%20%20Code%20%7C%20Heap%20%7C%20Stack%20%5D%0D%0AStart%20%20%20%20%20%20%20%20%20%20%20%20%20%20End%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Offset%20%20%20%20%20%20%20%20%20%20%20%20%20Perm%20Path%0D%0A0x00555ace650000%200x00555ace651000%200x00000000004000%20r--%20/tmp/test/exercises/practice/resistor-color/tests%0D%0A%60%60%60%0D%0A%0D%0ATLDR%20:%20Any%20variable%20that%20is%20actually%20a%20reference%20to%20another%20for%20our%20submissions%20should%20be%20in%20%60.data%60%20instead%20of%20%60.rodata%60%20due%20to%20a%20weird%20behaviour%20of%20the%20alpine%20linux's%20musl%20loader%20-%20maybe%20should%20be%20reported%20upstream?%0D%0A%0D%0ATo%20debug%20the%20crash%20I%20built%20the%20test-runner%20docker%20with%20this%20diff%0D%0A%60%60%60diff%0D%0Adiff%20--git%20a/Dockerfile%20b/Dockerfile%0D%0Aindex%202eb47d7..5bc1f98%20100644%0D%0A---%20a/Dockerfile%0D%0A+++%20b/Dockerfile%0D%0A@@%20-1,5%20+1,6%20@@%0D%0A%20FROM%20alpine:3.10%0D%0A-RUN%20apk%20add%20--no-cache%20coreutils%20gcc%20libc-dev%20make%20nasm%20python3%0D%0A+RUN%20apk%20add%20--no-cache%20coreutils%20gcc%20libc-dev%20make%20nasm%20python3%20gdb%20file%20musl-dbg%0D%0A+RUN%20sh%20-c%20%22$(wget%20https://gef.blah.cat/sh%20-O%20-)%22%0D%0A%20WORKDIR%20/opt/test-runner%0D%0A%20COPY%20run.sh%20bin/%0D%0A%20COPY%20process_results.py%20./%0D%0A%60%60%60%0D%0ACrash%20with%20more%20context%0D%0A%60%60%60%0D%0A$rax%20%20%20:%200x0%0D%0A$rbx%20%20%20:%200x8%0D%0A$rcx%20%20%20:%200x0055eea43d1080%20%20%E2%86%92%20%200x7262006b63616c62%20(%22black%22?)%0D%0A$rdx%20%20%20:%200x0%0D%0A$rsp%20%20%20:%200x007ffcf3236a00%20%20%E2%86%92%20%200x0000000000000000%0D%0A$rbp%20%20%20:%200x007fe6bfdafb40%20%20%E2%86%92%20%200x007fe6bfd1f000%20%20%E2%86%92%20%200x00010102464c457f%0D%0A$rsi%20%20%20:%200x007fe6bfdaf8a0%20%20%E2%86%92%20%200x0055eea43cd000%20%20%E2%86%92%20%20%20jg%200x55eea43cd047%0D%0A$rdi%20%20%20:%200x007fe6bfdaf8a0%20%20%E2%86%92%20%200x0055eea43cd000%20%20%E2%86%92%20%20%20jg%200x55eea43cd047%0D%0A$rip%20%20%20:%200x007fe6bfd7608c%20%20%E2%86%92%20%20%3Cdo_relocs+739%3E%20mov%20QWORD%20PTR%20%5Br12%5D,%20rcx%0D%0A$r8%20%20%20%20:%200x007fe6bfd2eaa0%20%20%E2%86%92%20%200x0800120000094c%20(%22L%5Ct%22?)%0D%0A$r9%20%20%20%20:%200x0055eea43d10bb%20%20%E2%86%92%20%20%3Ccolor_array+0%3E%20add%20BYTE%20PTR%20%5Brax+0x0%5D,%200x0%0D%0A$r10%20%20%20:%200x0055eea43cd452%20%20%E2%86%92%20%20%22__libc_start_main%22%0D%0A$r11%20%20%20:%200x0%0D%0A$r12%20%20%20:%200x0055eea43d10bb%20%20%E2%86%92%20%20%3Ccolor_array+0%3E%20add%20BYTE%20PTR%20%5Brax+0x0%5D,%200x0%0D%0A$r13%20%20%20:%200x0%0D%0A$r14%20%20%20:%200x007fe6bfdaf8a0%20%20%E2%86%92%20%200x0055eea43cd000%20%20%E2%86%92%20%20%20jg%200x55eea43cd047%0D%0A$r15%20%20%20:%200x0055eea43cd4c8%20%20%E2%86%92%20%20%20mov%20ebx,%200x40%0D%0A$eflags:%20%5Bzero%20carry%20parity%20adjust%20sign%20trap%20INTERRUPT%20direction%20overflow%20RESUME%20virtualx86%20identification%5D%0D%0A$cs:%200x33%20$ss:%200x2b%20$ds:%200x00%20$es:%200x00%20$fs:%200x00%20$gs:%200x00%0D%0A%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%80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