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libbpf-tools: Add new feature ALSan #4120

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libbpf-tools: Add new feature ALSan #4120

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Commits on Aug 27, 2024

  1. libbpf-tools: Add submodule c-vector 

    Add submodule c-vector
https://github.com/eteran/c-vector

This project is header only library project that contains interfaces
and implementations of vector container which can be used in C
The license of this project is MIT
    @Bojun-Seo
    Bojun-Seo committed Aug 27, 2024
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  2. libbpf-tools: Add submodule uthash 

    Add submodule uthash
https://github.com/troydhanson/uthash

This project is header only library project that contains interfaces
and implementations of hash map container which can be used in C
The license is written on the top of the file uthash.h
    @Bojun-Seo
    Bojun-Seo committed Aug 27, 2024
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  3. libbpf-tools: Add new feature ALSan on libbpf-tools 

    Add ALSan(Attachable Leak Sanitizer) feature on libbpf-tools
ALSan feature originally comes from the llvm-project lsan
https://github.com/llvm/llvm-project
This tool detect and report unreachable memory periodically

USAGE:

  $ ./alsan -h
  Usage: alsan [OPTION...]
  Detect memory leak resulting from unreachable pointers.

  Either -c or -p is a mandatory option
  EXAMPLES:
      alsan -p 1234             # Detect leaks on process id 1234
      alsan -c a.out            # Detect leaks on a.out
      alsan -c 'a.out arg'      # Detect leaks on a.out with argument

    -c, --command=COMMAND      Execute and detect memory leak on the specified
                               command
    -i, --interval=INTERVAL    Set interval in second to detect leak
    -p, --pid=PID              Detect memory leak on the specified process
    -s, --suppressions=SUPPRESSIONS
                               Suppressions file name
    -T, --top=TOP              Report only specified amount of backtraces
    -v, --verbose              Verbose debug output
    -w, --stop-the-world       Stop the target process during tracing
    -?, --help                 Give this help list
        --usage                Give a short usage message
    -V, --version              Print program version

  Mandatory or optional arguments to long options are also mandatory or optional
  for any corresponding short options.

  Report bugs to https://github.com/iovisor/bcc/tree/master/libbpf-tools.

Report example:

  $ sudo ./alsan -p 28346

  [2024-05-22 14:44:58] Print leaks:
  44 bytes direct leak found in 1 allocations from stack id(57214)
          iovisor#1 0x00583bca1b2250 baz+0x1c (/home/bojun/alsan/libbpf-tools/a.out+0x1250)
          iovisor#2 0x00583bca1b22d7 main+0x73 (/home/bojun/alsan/libbpf-tools/a.out+0x12d7)
          iovisor#3 0x007470c7c2a1ca [unknown] (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a1ca)
          iovisor#4 0x007470c7c2a28b __libc_start_main+0x8b (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a28b)
          iovisor#5 0x00583bca1b2105 _start+0x25 (/home/bojun/alsan/libbpf-tools/a.out+0x1105)

  [2024-05-22 14:45:08] Print leaks:
  132 bytes direct leak found in 3 allocations from stack id(57214)
          iovisor#1 0x00583bca1b2250 baz+0x1c (/home/bojun/alsan/libbpf-tools/a.out+0x1250)
          iovisor#2 0x00583bca1b22d7 main+0x73 (/home/bojun/alsan/libbpf-tools/a.out+0x12d7)
          iovisor#3 0x007470c7c2a1ca [unknown] (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a1ca)
          iovisor#4 0x007470c7c2a28b __libc_start_main+0x8b (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a28b)
          iovisor#5 0x00583bca1b2105 _start+0x25 (/home/bojun/alsan/libbpf-tools/a.out+0x1105)

Source code of test program:

  $ cat leak_test.c
  #include <stdlib.h>
  #include <unistd.h>

  int *arr[10000];

  int *foo(size_t size) {
          int *tmp = malloc(size);
          *tmp = 99;
          return tmp;
  }

  int *bar(size_t nmemb, size_t size) {
          int *tmp = calloc(nmemb, size);
          *tmp = 22;
          return tmp;
  }

  int *baz(size_t size) {
          int *tmp = valloc(size);
          *tmp = 11;
          return tmp;
  }

  int main(int argc, char* argv[]) {
          int *a;
          int i = 0;
          while (1) {
                  a = foo(4);
                  arr[i++] = a;
                  a = bar(4, 4);
                  free(a);
                  a = baz(44);
                  sleep(5);
          }
          return 0;
  }
    @Bojun-Seo
    Bojun-Seo committed Aug 27, 2024
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