I'm not going to go too deep into the basics of Rust, there is a great resource here, which will help you getting started with Rust. We are going to start from a simple examlpe with the assumption that you know the bare minimum of Rust and are familiar with reverse engineering binaries. This article only covers the places where I feel reversing a Rust binary differs from c binary, if you have familiarity with reversing c++ binaries you will likely be able to skip to the end.
Start by building your first Rust project with:
$ cargo new hello_world --binWhich produces the source code:
fn main() {
println!("Hello, world!");
}And can be compiled with:
$ cargo buildWhen we use nm on the binary produced by the build we see that it produces a list of symbols we can examine.
...
U writev@@GLIBC_2.2.5
U __xpg_strerror_r@@GLIBC_2.3.4
0000000000005270 t _ZN11hello_world4main17hb5a7b00b6473ee4dE
000000000000ec70 t _ZN12panic_unwind3imp14find_eh_action28_$u7b$$u7b$closure$u7d$$u7d$17h01c912f154f734c1E
...
We are most interested in the symbol _ZN11hello_world4main17hb5a7b00b6473ee4dE. We can demangle each reference with a c++ tool called c++filt, which will tell us that the symbol refers to hello_world::main.
$ c++filt _ZN11hello_world4main17hb5a7b00b6473ee4dE
hello_world::main
_ZN8blahblahE explained
Simply put _ZN11hello_world4main17hb5a7b00b6473ee4dE consists of the numeric length of a string and the string itself. hello_world is 11 charachters, main is 4, with the default delimiter ::. And hb5a7b00b6473ee4d is 17 bytes, with E as the EOL.
full `nm` output
$ nm target/debug/hello_world
00000000000136b0 t abbrev_compare
U abort@@GLIBC_2.2.5
0000000000014bb0 t add_function_range.isra.0
0000000000014b00 t add_line.isra.0
00000000000136d0 t add_unit_addr
0000000000013870 t advance.part.0
0000000000031040 D anon.06f3b36a0fb3673c2f7c66bd3b539142.48.llvm.3617607378679464731
0000000000026cf2 R anon.089730133c12fa7217617d8f93ba7d2b.16.llvm.9821149168950303654
0000000000026cf5 R anon.089730133c12fa7217617d8f93ba7d2b.17.llvm.9821149168950303654
0000000000026cf7 R anon.089730133c12fa7217617d8f93ba7d2b.18.llvm.9821149168950303654
0000000000026cf9 R anon.089730133c12fa7217617d8f93ba7d2b.19.llvm.9821149168950303654
0000000000026cfb R anon.089730133c12fa7217617d8f93ba7d2b.20.llvm.9821149168950303654
0000000000026cfe R anon.089730133c12fa7217617d8f93ba7d2b.21.llvm.9821149168950303654
0000000000026cff R anon.089730133c12fa7217617d8f93ba7d2b.22.llvm.9821149168950303654
0000000000026d01 R anon.089730133c12fa7217617d8f93ba7d2b.23.llvm.9821149168950303654
0000000000026d03 R anon.089730133c12fa7217617d8f93ba7d2b.24.llvm.9821149168950303654
0000000000026d04 R anon.089730133c12fa7217617d8f93ba7d2b.25.llvm.9821149168950303654
0000000000026d05 R anon.089730133c12fa7217617d8f93ba7d2b.26.llvm.9821149168950303654
0000000000026d06 R anon.089730133c12fa7217617d8f93ba7d2b.27.llvm.9821149168950303654
0000000000026d07 R anon.089730133c12fa7217617d8f93ba7d2b.29.llvm.9821149168950303654
0000000000026d08 R anon.089730133c12fa7217617d8f93ba7d2b.33.llvm.9821149168950303654
00000000000316c8 D anon.089730133c12fa7217617d8f93ba7d2b.43.llvm.9821149168950303654
00000000000316e0 D anon.089730133c12fa7217617d8f93ba7d2b.44.llvm.9821149168950303654
00000000000316f8 D anon.089730133c12fa7217617d8f93ba7d2b.45.llvm.9821149168950303654
0000000000031710 D anon.089730133c12fa7217617d8f93ba7d2b.46.llvm.9821149168950303654
0000000000031728 D anon.089730133c12fa7217617d8f93ba7d2b.47.llvm.9821149168950303654
0000000000031740 D anon.089730133c12fa7217617d8f93ba7d2b.48.llvm.9821149168950303654
0000000000025bb2 R anon.1a328cb1f790579e122af0343cdbeecc.6.llvm.3221381995650050996
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0000000000030598 D anon.20af00befe3dd4171761ec1e1c23bf16.11.llvm.14722412125050928257
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0000000000023c67 R anon.20af00befe3dd4171761ec1e1c23bf16.18.llvm.14722412125050928257
00000000000305d8 D anon.20af00befe3dd4171761ec1e1c23bf16.30.llvm.14722412125050928257
0000000000023cba R anon.20af00befe3dd4171761ec1e1c23bf16.31.llvm.14722412125050928257
0000000000030530 D anon.20af00befe3dd4171761ec1e1c23bf16.3.llvm.14722412125050928257
00000000000305f0 D anon.20af00befe3dd4171761ec1e1c23bf16.40.llvm.14722412125050928257
0000000000023d14 R anon.20af00befe3dd4171761ec1e1c23bf16.41.llvm.14722412125050928257
0000000000023bf4 R anon.20af00befe3dd4171761ec1e1c23bf16.5.llvm.14722412125050928257
0000000000023c04 R anon.20af00befe3dd4171761ec1e1c23bf16.6.llvm.14722412125050928257
0000000000025f53 R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.46.llvm.235460764318738879
0000000000025fa5 R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.47.llvm.235460764318738879
00000000000260ca R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.48.llvm.235460764318738879
0000000000026204 R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.49.llvm.235460764318738879
000000000002624a R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.50.llvm.235460764318738879
00000000000262f0 R anon.3dff7bba8de4c451c54abbbb6bc2ef3f.51.llvm.235460764318738879
0000000000030c10 D anon.5184c9c94e2b15172d042a5888b7f0e6.6.llvm.4578759908112325694
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00000000000304d8 D anon.571b1fc9e613c4e007171b911e6dc0a1.5.llvm.8703683633474549298
0000000000030508 D anon.571b1fc9e613c4e007171b911e6dc0a1.7.llvm.8703683633474549298
0000000000030518 D anon.571b1fc9e613c4e007171b911e6dc0a1.8.llvm.8703683633474549298
00000000000235aa R anon.615bb761a9fbe17bc4f14d83fbc8ac10.10.llvm.13464397735276938284
0000000000030348 D anon.615bb761a9fbe17bc4f14d83fbc8ac10.31.llvm.13464397735276938284
0000000000023701 R anon.615bb761a9fbe17bc4f14d83fbc8ac10.32.llvm.13464397735276938284
0000000000030258 D anon.615bb761a9fbe17bc4f14d83fbc8ac10.5.llvm.13464397735276938284
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0000000000030380 D anon.61e658ef6d126053252eeff2ac369bfc.15.llvm.7408383674114746665
0000000000030410 D anon.61e658ef6d126053252eeff2ac369bfc.37.llvm.7408383674114746665
0000000000030418 D anon.61e658ef6d126053252eeff2ac369bfc.55.llvm.7408383674114746665
0000000000023a22 R anon.61e658ef6d126053252eeff2ac369bfc.56.llvm.7408383674114746665
00000000000309b0 D anon.64f20fb2b35696e33e6bfd3d81c9b7a1.2.llvm.15546015952955963599
0000000000030908 D anon.66967ab49e082e229e927a866b98a119.11.llvm.13299720880406537282
0000000000023ffe R anon.66967ab49e082e229e927a866b98a119.15.llvm.13299720880406537282
000000000002400c R anon.66967ab49e082e229e927a866b98a119.16.llvm.13299720880406537282
0000000000024010 R anon.66967ab49e082e229e927a866b98a119.17.llvm.13299720880406537282
00000000000308e0 D anon.66967ab49e082e229e927a866b98a119.8.llvm.13299720880406537282
00000000000259a5 R anon.8665b36fbc3e07b4b6ff35be648ce3df.2.llvm.3712589730771029109
000000000002353c R anon.8ddcb3e6cdeb75a256e0761cba0dd47b.0.llvm.16905710976659750015
000000000002353e R anon.8ddcb3e6cdeb75a256e0761cba0dd47b.2.llvm.16905710976659750015
0000000000030a60 D anon.b3c93e03595a8198d9ad0a4d166235ba.2.llvm.9535220708313256981
00000000000232b2 R anon.d1ca5ee604450711f839ff92e0c1c341.4.llvm.15251854126160160905
00000000000300e0 D anon.d1ca5ee604450711f839ff92e0c1c341.52.llvm.15251854126160160905
0000000000030180 D anon.d1ca5ee604450711f839ff92e0c1c341.69.llvm.15251854126160160905
0000000000030088 D anon.d1ca5ee604450711f839ff92e0c1c341.6.llvm.15251854126160160905
00000000000301a0 D anon.d1ca5ee604450711f839ff92e0c1c341.72.llvm.15251854126160160905
000000000002343c R anon.d1ca5ee604450711f839ff92e0c1c341.73.llvm.15251854126160160905
00000000000301e0 D anon.d1ca5ee604450711f839ff92e0c1c341.95.llvm.15251854126160160905
0000000000023480 R anon.d1ca5ee604450711f839ff92e0c1c341.96.llvm.15251854126160160905
0000000000030fe0 D anon.d30831f3488f9b216ba236cb8565ef27.9.llvm.689403275060108414
000000000002fdd8 D anon.dcd23e8baa7f711878d5fc85d3ee8919.25.llvm.16068065643866689459
000000000002fed8 D anon.dcd23e8baa7f711878d5fc85d3ee8919.42.llvm.16068065643866689459
0000000000030048 D anon.dcd23e8baa7f711878d5fc85d3ee8919.84.llvm.16068065643866689459
000000000002324b R anon.dcd23e8baa7f711878d5fc85d3ee8919.85.llvm.16068065643866689459
0000000000030870 D anon.dead67312ebd92c87a8a5945f13fb94d.29.llvm.6427174176799064609
0000000000023f3c R anon.dead67312ebd92c87a8a5945f13fb94d.30.llvm.6427174176799064609
00000000000307d0 D anon.dead67312ebd92c87a8a5945f13fb94d.4.llvm.6427174176799064609
0000000000030820 D anon.dead67312ebd92c87a8a5945f13fb94d.9.llvm.6427174176799064609
000000000002406c R anon.f50421931c6c96c5a581a6db23b7e6cb.3.llvm.18113466118128623723
0000000000030430 D anon.f72a734e98f65bcdd85b0041a440400a.2.llvm.7143059675557422788
0000000000030458 D anon.f72a734e98f65bcdd85b0041a440400a.4.llvm.7143059675557422788
0000000000030480 D anon.f72a734e98f65bcdd85b0041a440400a.5.llvm.7143059675557422788
U bcmp@@GLIBC_2.2.5
0000000000032038 B __bss_start
U close@@GLIBC_2.2.5
0000000000032038 b completed.8055
00000000000246c0 r crc32_table.5726
w __cxa_finalize@@GLIBC_2.2.5
w __cxa_thread_atexit_impl@@GLIBC_2.18
000000000002fd00 d debug_section_names
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0000000000022810 T __divti3
U dladdr@@GLIBC_2.2.5
U dl_iterate_phdr@@GLIBC_2.2.5
0000000000005220 t __do_global_dtors_aux
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0000000000016bb0 t dwarf_fileline
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0000000000005164 t dwarf_lookup_pc.cold
0000000000032008 V DW.ref.rust_eh_personality
0000000000031780 d _DYNAMIC
0000000000032038 D _edata
0000000000011ce0 t elf_add
000000000000515a t elf_add.cold
0000000000010510 t elf_nodebug
0000000000010530 t elf_nosyms
0000000000010550 t elf_symbol_compare
0000000000010570 t elf_syminfo
0000000000005155 t elf_syminfo.cold
0000000000010620 t elf_try_debugfile
0000000000011c50 t elf_uncompress_zdebug.part.0
0000000000024ac0 r elf_zlib_default_dist_table
0000000000024cc0 r elf_zlib_default_table
0000000000010be0 t elf_zlib_inflate_and_verify
0000000000010750 t elf_zlib_inflate_table
00000000000321d8 B _end
U __errno_location@@GLIBC_2.2.5
00000000000100e0 t fileline_initialize
0000000000005150 t fileline_initialize.cold
0000000000014360 t find_address_ranges
0000000000022928 T _fini
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0000000000016c80 t free_abbrevs.isra.0
U free@@GLIBC_2.2.5
0000000000013800 t free_line_header
0000000000014c60 t function_addrs_compare
U __fxstat@@GLIBC_2.2.5
000000000002e2e4 r GCC_except_table0
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U getcwd@@GLIBC_2.2.5
U getenv@@GLIBC_2.2.5
U getpid@@GLIBC_2.2.5
00000000000319b0 d _GLOBAL_OFFSET_TABLE_
w __gmon_start__
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000000000000e780 T _ZN60_$LT$std..io..error..Error$u20$as$u20$core..fmt..Display$GT$3fmt17h3d3ecc4c07282597E
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0000000000019cb0 T _ZN64_$LT$rustc_demangle..v0..Ident$u20$as$u20$core..fmt..Display$GT$3fmt17hbe6562d89d1c5279E
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000000000000dc30 T _ZN64_$LT$std..sys..unix..stdio..Stdout$u20$as$u20$std..io..Write$GT$5flush17hb323ecb6397a249eE
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000000000000bb20 T _ZN68_$LT$std..thread..local..AccessError$u20$as$u20$core..fmt..Debug$GT$3fmt17hf58157959ae9103fE
000000000000f800 T _ZN71_$LT$backtrace..symbolize..SymbolName$u20$as$u20$core..fmt..Display$GT$3fmt17hee22c494b9bf7864E
000000000001da40 t _ZN71_$LT$core..ops..range..Range$LT$Idx$GT$$u20$as$u20$core..fmt..Debug$GT$3fmt17h025031f2bc0e83b8E
0000000000018990 T _ZN71_$LT$rustc_demangle..legacy..Demangle$u20$as$u20$core..fmt..Display$GT$3fmt17haa99c64e1127f94fE
00000000000099a0 t _ZN72_$LT$std..io..buffered..BufWriter$LT$W$GT$$u20$as$u20$std..io..Write$GT$5write17hae82f57ace57003aE
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00000000000100b0 T _ZN77_$LT$backtrace..print..BacktraceFrameFmt$u20$as$u20$core..ops..drop..Drop$GT$4drop17hf3e4716064fdb73eE
0000000000009af0 t _ZN79_$LT$std..io..buffered..BufWriter$LT$W$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17h0f1876b838519446E
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000000000000ae90 T _ZN82_$LT$std..sys_common..poison..PoisonError$LT$T$GT$$u20$as$u20$core..fmt..Debug$GT$3fmt17h9cc4c6c48f969563E
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000000000000f750 T _ZN9backtrace9backtrace9libunwind5trace8trace_fn17hf62dee809d9157b1E
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Naturally we wouldn't want to manually demangle earh function name, so we can also ask nm to demangle the output for us.
$ nm --demangle target/debug/hello_world
...
U writev@@GLIBC_2.2.5
U __xpg_strerror_r@@GLIBC_2.3.4
0000000000005270 t hello_world::main
000000000000ec70 t panic_unwind::imp::find_eh_action::{{closure}}
000000000000ec60 t panic_unwind::imp::find_eh_action::{{closure}}
...
full `nm --demangle` output
$ nm --demangle target/debug/hello_world
00000000000136b0 t abbrev_compare
U abort@@GLIBC_2.2.5
0000000000014bb0 t add_function_range.isra.0
0000000000014b00 t add_line.isra.0
00000000000136d0 t add_unit_addr
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0000000000031040 D anon.06f3b36a0fb3673c2f7c66bd3b539142.48.llvm.3617607378679464731
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As we can see in the gdb backtrace and strace output below we can track all the syscalls without issue. And, as long as the binary isn't stripped and optimized, we can easily track the compiled binaries.
[#0] 0x7ffff7df19ef → __fopen_internal(is32=0x1, mode=0x7ffff7f8f47c "rce", filen
ame=0x7ffff7f8f480 "/proc/self/maps")
[#1] 0x7ffff7df19ef → _IO_new_fopen(filename=0x7ffff7f8f480 "/proc/self/maps", mo
de=0x7ffff7f8f47c "rce")
[#2] 0x7ffff7f8262b → pthread_getattr_np(thread_id=0x7ffff7d6ac00, attr=0x7fffff$
fdfb0)
[#3] 0x555555560ce2 → std::sys::unix::thread::guard::init()
[#4] 0x55555555b70e → std::rt::lang_start_internal()
[#5] 0x555555559348 → std::rt::lang_start()
[#6] 0x55555555930b → main()
...
brk(NULL) = 0x556acd05e000
brk(0x556acd07f000) = 0x556acd07f000
→ openat(AT_FDCWD, "/proc/self/maps", O_RDONLY|O_CLOEXEC) = 3
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
...
full `strace` output
execve("target/release/hello_world", ["target/release/hello_world"], 0x7fffc0c4d8b0 /* 46 vars */) = 0
brk(NULL) = 0x5579c5dd7000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc10c1fbf0) = -1 EINVAL (Invalid argument)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=170218, ...}) = 0
mmap(NULL, 170218, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fe465580000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \22\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=18816, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe46557e000
mmap(NULL, 20752, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fe465578000
mmap(0x7fe465579000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7fe465579000
mmap(0x7fe46557b000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fe46557b000
mmap(0x7fe46557c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fe46557c000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\201\0\0\0\0\0\0"..., 832) = 832
lseek(3, 824, SEEK_SET) = 824
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\177A\7\337\204\332b_\33DZ\336\207~\36\n"..., 68) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=158288, ...}) = 0
lseek(3, 824, SEEK_SET) = 824
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\177A\7\337\204\332b_\33DZ\336\207~\36\n"..., 68) = 68
mmap(NULL, 140448, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fe465555000
mmap(0x7fe46555c000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7fe46555c000
mmap(0x7fe46556d000, 20480, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0x7fe46556d000
mmap(0x7fe465572000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c000) = 0x7fe465572000
mmap(0x7fe465574000, 13472, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fe465574000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3405\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=100888, ...}) = 0
mmap(NULL, 103504, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fe46553b000
mmap(0x7fe46553e000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fe46553e000
mmap(0x7fe46554f000, 16384, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7fe46554f000
mmap(0x7fe465553000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7fe465553000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360r\2\0\0\0\0\0"..., 832) = 832
lseek(3, 64, SEEK_SET) = 64
read(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784) = 784
lseek(3, 848, SEEK_SET) = 848
read(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32) = 32
lseek(3, 880, SEEK_SET) = 880
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0q7?\324>\326\250>\n\253\230<:\227\0362"..., 68) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=2025032, ...}) = 0
lseek(3, 64, SEEK_SET) = 64
read(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784) = 784
lseek(3, 848, SEEK_SET) = 848
read(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32) = 32
lseek(3, 880, SEEK_SET) = 880
read(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0q7?\324>\326\250>\n\253\230<:\227\0362"..., 68) = 68
mmap(NULL, 2032984, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fe46534a000
mmap(0x7fe46536f000, 1540096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x25000) = 0x7fe46536f000
mmap(0x7fe4654e7000, 303104, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19d000) = 0x7fe4654e7000
mmap(0x7fe465531000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e6000) = 0x7fe465531000
mmap(0x7fe465537000, 13656, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fe465537000
close(3) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe465348000
arch_prctl(ARCH_SET_FS, 0x7fe465348c00) = 0
mprotect(0x7fe465531000, 12288, PROT_READ) = 0
mprotect(0x7fe465553000, 4096, PROT_READ) = 0
mprotect(0x7fe465572000, 4096, PROT_READ) = 0
mprotect(0x7fe46557c000, 4096, PROT_READ) = 0
mprotect(0x5579c46ba000, 12288, PROT_READ) = 0
mprotect(0x7fe4655d6000, 4096, PROT_READ) = 0
munmap(0x7fe465580000, 170218) = 0
set_tid_address(0x7fe465348ed0) = 22237
set_robust_list(0x7fe465348ee0, 24) = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7fe46555cc50, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7fe46556a540}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7fe46555ccf0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fe46556a540}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7fe465390470}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
brk(NULL) = 0x5579c5dd7000
brk(0x5579c5df8000) = 0x5579c5df8000
openat(AT_FDCWD, "/proc/self/maps", O_RDONLY|O_CLOEXEC) = 3
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "5579c468b000-5579c4690000 r--p 0"..., 1024) = 1024
read(3, "bc-2.30.so\n7fe4654e7000-7fe46553"..., 1024) = 1024
read(3, "libpthread-2.30.so\n7fe46555c000-"..., 1024) = 1024
read(3, " /lib/x86_64-linux-gnu/l"..., 1024) = 998
close(3) = 0
sched_getaffinity(22237, 32, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]) = 8
rt_sigaction(SIGSEGV, {sa_handler=0x5579c46913f0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_SIGINFO, sa_restorer=0x7fe46556a540}, NULL, 8) = 0
rt_sigaction(SIGBUS, {sa_handler=0x5579c46913f0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_SIGINFO, sa_restorer=0x7fe46556a540}, NULL, 8) = 0
sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe4655a8000
sigaltstack({ss_sp=0x7fe4655a8000, ss_flags=0, ss_size=8192}, NULL) = 0
write(1, "Hello, world!\n", 14Hello, world!
) = 14
sigaltstack({ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=8192}, NULL) = 0
munmap(0x7fe4655a8000, 8192) = 0
exit_group(0) = ?
+++ exited with 0 +++
However, as we can see from the ltrace output a traditional way of tracking what the binary is doing, by also tracking library calls, yields no results.
Hello, world!
+++ exited (status 0) +++
When we go back to our example program we can see that the Rust core::fmt::write function, which handles the println! macro, is ultimately a wrapper for the syscall write. More complicated programs yield a similar result, as the Rust developers have chosen to implement many of the core features themselves for security reasons, rather than leaning on the libc implemenattion of these functions. This has advantages for developers, and disadvantages when reverse-engineering.
showing the `write` wrapper in `gdb`
0x555555573287 <core::fmt::write+7> push r12
0x555555573289 <core::fmt::write+9> push rbx
0x55555557328a <core::fmt::write+10> sub rsp, 0x68
→ 0x55555557328e <core::fmt::write+14> mov rcx, rsi
0x555555573291 <core::fmt::write+17> mov r15, QWORD PTR [rdx+0x20]
0x555555573295 <core::fmt::write+21> mov r12, QWORD PTR [rdx+0x28]
0x555555573299 <core::fmt::write+25> mov rax, r12
0x55555557329c <core::fmt::write+28> shl rax, 0x4
0x5555555732a0 <core::fmt::write+32> add rax, r15
──────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "hello_world", stopped 0x55555557328e in core::fmt::write (), re
ason: SINGLE STEP
────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x55555557328e → core::fmt::write()
[#1] 0x55555555e5ac → <std::io::stdio::Stdout as std::io::Write>::write_fmt()
[#2] 0x55555555ff6c → std::thread::local::LocalKey<T>::try_with()
[#3] 0x55555555e825 → std::io::stdio::_print()
[#4] 0x5555555592a2 → hello_world::main()
core:fmt::write, above is ultimately a wrapper for the syscall write below.
Hello, world!
0x00007ffff7f8b247 26 in ../sysdeps/unix/sysv/linux/write.c
...
──────────────────────────────────────────────────────────────── code:x86:64 ────
0x7ffff7f8b23e <write+14> jne 0x7ffff7f8b250 <__libc_write+32>
0x7ffff7f8b240 <write+16> mov eax, 0x1
0x7ffff7f8b245 <write+21> syscall
→ 0x7ffff7f8b247 <write+23> cmp rax, 0xfffffffffffff000
0x7ffff7f8b24d <write+29> ja 0x7ffff7f8b2a0 <__libc_write+112>
0x7ffff7f8b24f <write+31> ret
0x7ffff7f8b250 <write+32> sub rsp, 0x28
0x7ffff7f8b254 <write+36> mov QWORD PTR [rsp+0x18], rdx
0x7ffff7f8b259 <write+41> mov QWORD PTR [rsp+0x10], rsi
──────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "hello_world", stopped 0x7ffff7f8b247 in __libc_write (), reason
: SINGLE STEP
────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x7ffff7f8b247 → __libc_write(fd=0x1, buf=0x555555587510, nbytes=0xe)
[#1] 0x55555555f063 → std::sys::unix::fd::FileDesc::write()
[#2] 0x55555555d7be → _ZN3std2io8buffered18BufWriter$LT$W$GT$9flush_buf17h3330dd4
a5d137e32E.llvm.13464397735276938284()
[#3] 0x55555555dcc3 → <std::io::buffered::LineWriter<W> as std::io::Write>::write
()
[#4] 0x55555555ea90 → std::io::Write::write_all()
[#5] 0x55555555df7b → <std::io::Write::write_fmt::Adaptor<T> as core::fmt::Write>
::write_str()
[#6] 0x55555557362a → core::fmt::write()
[#7] 0x55555555e5ac → <std::io::stdio::Stdout as std::io::Write>::write_fmt()
[#8] 0x55555555ff6c → std::thread::local::LocalKey<T>::try_with()
[#9] 0x55555555e825 → std::io::stdio::_print()
─────────────────────────────────────────────────────────────────────────────────
Besides from this the release version, compiled as shown below, adds an optimization step to the compilation.
$ cargo build --releaseThe optimization means that the following code produces 50 instructions ¹, produces only 2 instructions _² when optimized with -O.
pub fn func(num: i32) -> i32 {
let mut out = 5;
for x in 1..10 {
out = x * num
}
return out
}We can really see the difference optimization makes in a simple cryptography example, as shown in the function crypt below.
fn crypt() { // translates to _ZN3rsa5crypt17h14dc02da3f4c31e6E in the debug strings
let mut rng = OsRng;
let bits = 2048;
let key = RSAPrivateKey::new(&mut rng, bits).expect("failed to generate a key");
let data = b"hello world";
// Encrypt
let enc_data = key.encrypt(&mut rng, PaddingScheme::PKCS1v15, &data[..]).expect("failed to encrypt");
assert_ne!(&data[..], &enc_data[..]);
// Decrypt
let dec_data = key.decrypt(PaddingScheme::PKCS1v15, &enc_data).expect("failed to decrypt");
assert_eq!(&data[..], &dec_data[..]);
println!("{:?}",dec_data);
}When we compile it as a debug binary, with cargo build and run nm on the binary we see that it contains the function above.
$ nm target/debug/rsa |grep rsa5crypt
0000000000016340 t _ZN3rsa5crypt17h14dc02da3f4c31e6EHowever, when we compile the release version the function is nowhere to be seen.
nm target/release/rsa |grep crypt
000000000000e630 T _ZN3rsa3key13RSAPrivateKey7decrypt17h64444243cdd2cc85E
0000000000006c50 t _ZN63_$LT$rsa..key..RSAPrivateKey$u20$as$u20$rsa..key..PublicKey$GT$7encrypt17ha9b1f7d1944faeaaEThis is probable because the function has been optimized or completely inlined. Using a string constant we know from the above code 'hello world' we can work out where the code has gone to. (This could also have been an error message or other fixed constant we can extract easily from the binary.)
First we use radare2's build-in strings function izz to search for the constant. We use a search string without white space to avoid quotation marks.
$ r2 -AA target/release/rsa.stripped
:> izz |grep hello
323 0x000096ac 0x000096ac 9 10 (.text) ascii hello woH
6614 0x00057300 0x00057300 296 297 (.rodata) ascii attempt to divide by zeroinvalid static exponentcalled `Option::unwrap()` on a `None` valuesrc/libcore/option.rsfailed to generate a keyhello worldfailed to encryptassertion failed: `(left != right)`\n left: ``,\n right: ``src/main.rs\nfailed to decryptassertion failed: `(left == right)`\n left: `With a full reference found in the second string we look up where it is referenced in the code. hello world starts at 0x88 in the second string, add the address 0x00057300 the data is at we get 0x00057388. Using the command axt [addr] (find data/code references to this address) As the strings aren't NUL terminated there are likely exact references with fixed lengths in the assembly.
we find the reference to the string:
:> axt 0x57388
sym.rsa::main::h9946c3a66e194e94 0x9677 [DATA] lea r14, [0x00057388]
:> s 0x9677From visual mode (V<enter>p) we see see confirmed what we saw above, that the whole function had been inlined. We also see that a fixed value of the string is used 0xb (11.)
| 0x00009677 4c8d350add04. lea r14, [0x00057388] ; "hello worldfailed to encryptassertion failed: `(left != right)`\n left:
| 0x0000967e 488dbc249000. lea rdi, [var_90h]
| 0x00009686 4889e2 mov rdx, rsp
| 0x00009689 41b90b000000 mov r9d, 0xb