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Linux, execve how to run a child binary and pass payload efficently?


Linux, execve how to run a child binary and pass payload efficently?

By : user2949064
Date : November 16 2020, 06:23 AM
will help you The advantage of your file-approach is that it is non-volatile and the data can be easily distributed around the globe as file.
Based on your thought about pipes, I assume your "distributed computing" is on the same node. You could also use shared memory see: shm_open and pass the name of the "file" name of your shared memory to the child. BTW. Pipes or FIFOs let you easily synchornize using poll/select. AFAIK you need a bit more infrastructure to synchronize access to Shared Memory.
code :


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Efficently returning parent and child records with NHiberate

Efficently returning parent and child records with NHiberate


By : user1745588
Date : March 29 2020, 07:55 AM
will help you The problem is that SetMaxResults is not applied to the number of root entities returned from the query, it is translated into a T-SQL TOP (in the case of SqlServer), which is applied to the result from a join query. Since there is one row in the result set for each child of a root entity the TOP will not have the desired effect.
To achieve a limit on the number of root entities you could use a join query with a subquery that contains the SetMaxResults limit.
code :
// Select the ids of the first ten posts
var subquery = DetachedCriteria.For<Post>()
    .SetMaxResults(10)
    .SetProjection(Projections.Property("Id"));

// Do a join query with posts and tags, for the posts who's ids are
// in the result of the subquery
var posts = session.CreateCriteria<Post>()
    .SetFetchMode("Tags", FetchMode.Join)
    .Add(Subqueries.PropertyIn("Id", subquery))
    .SetResultTransformer(Transformers.DistinctRootEntity)
    .List<Post>();
Delphi: how to efficently read a big binary file, converting it to hexadecimal for passing it as a varbinary(max) parame

Delphi: how to efficently read a big binary file, converting it to hexadecimal for passing it as a varbinary(max) parame


By : Niluka Senani
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Well here's a option that would do the conversion as fast as I can think of.
Features of the code:
code :
function TEditorDeschidereDeCredite.FileToHex(FileName: string): AnsiString;
var FS:TFileStream;
    PS:PAnsiChar;
    Block:array[0..1023] of byte; // 1Kb
    len,i,pos:Integer;
    B:Byte;
const Nibbs: array[0..15] of AnsiChar = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
begin
  FS := TFileStream.Create(FileName, fmOpenRead);
  try
    Result := '';
    SetLength(Result, FS.Size * 2);
    PS := PAnsiChar(Result);
    pos := 0; // position into the result string
    len := FS.Read(Block, SizeOf(Block));
    while len <> 0 do
    begin
      for i:=0 to len-1 do
      begin
        B := Block[i];
        PS[pos] := Nibbs[B div $F];
        Inc(pos);
        PS[pos] := Nibbs[B mod $F];
        Inc(pos);
      end;
      len := FS.Read(Block, SizeOf(Block));
    end;
  finally FS.Free;
  end;
end;
Replicating execve in c (Linux)?

Replicating execve in c (Linux)?


By : Saad Ahmed
Date : March 29 2020, 07:55 AM
it fixes the issue Your main problem here is that part of the exec system call is overriding the process descriptor in the kernel. It's something you can't do in userspace. Even if you close all file descriptors there are still plenty of other values you can't reach, nor can you free up dynamically loaded libraries and release you own program's code pages (since they would be write protected).
The basic approach to loading and running a code file would be to mmap it into the memory, then clear the stack, parse the ELF headers and jump to the program start function (assembly jmp instruction, mind you) But there's much more to an ELF file so it might not work without other initializations and dynamic linkage...
execve on linux, execute from arguments

execve on linux, execute from arguments


By : Y.Celik
Date : March 29 2020, 07:55 AM
will be helpful for those in need I need to create a program that allows the user to execute a command passed as argument using execve in linux. I'm not sure about the syntax of the execve command. I wrote the program but it doesn't work with multiple arguments and I can't figure out why. , This version is corrected:
code :
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
int main(int argc, char **argv)
{
int status;
pid_t pid;
if((pid = fork())>0)
{
    ///Father process
    wait(&status);
    printf("Process terminated with status = %d\n",status);
}
else
{
    ///son process
    int i;
    char program[100];

    printf("I'm the son woth PID= %d\n",getpid());
    strcpy(program,argv[1]);

    printf("Program: %s\n", program);

    execve(program, argv+1, NULL);
    exit(0);
}


return 0;
}
$ ./a.out /bin/cp a.txt b.txt
I'm the son woth PID= 1590
Program: /bin/cp
/bin/cp
a.txt
b.txt
Process terminated with status = 0
./a.out /bin/ls
I'm the son woth PID= 3021
Program: /bin/ls
/bin/ls
a.c a.out
Process terminated with status = 0
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
int main(int argc, char **argv)
{
int status;
pid_t pid;
if((pid = fork())>0)
{
    ///Father process
    wait(&status);
    printf("Process terminated with status = %d\n",status);
}
else
{
    ///son process
    int i;
    char program[100];

    printf("I'm the son woth PID= %d\n",getpid());
    strcpy(program,argv[1]);

    printf("Program: %s\n", program);

    execvp(program, argv+1);
    exit(0);
}


return 0;
}
▶ ./a.out ls
I'm the son woth PID= 5056
Program: ls
a.c a.out
Process terminated with status = 0
How is execve invoked on linux?

How is execve invoked on linux?


By : Ky Lân Vu Tong
Date : March 29 2020, 07:55 AM
wish of those help
On the other hand, if you look at the source for glibc, then execve() calls hurd_exec()
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