[Bug 1594338] [NEW] Using exec on a non-supported binary format shows "Success"

[Sworddragon]

Public bug reported:

I'm using Ubuntu 16.10 dev with bash 4.3-14ubuntu2 and on using exec on
a non-supported binary format I'm getting the output "Success" while the
file couldn't be executed like in this example:

sworddragon at ubuntu:~$ exec '/wine/drive_c/Program Files (x86)/Steam/Steam.exe'
bash: /wine/drive_c/Program Files (x86)/Steam/Steam.exe: cannot execute binary file: Exec format error
bash: /wine/drive_c/Program Files (x86)/Steam/Steam.exe: Success

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1594338

Title:
  Using exec on a non-supported binary format shows "Success"

Status in bash package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 16.10 dev with bash 4.3-14ubuntu2 and on using exec
  on a non-supported binary format I'm getting the output "Success"
  while the file couldn't be executed like in this example:

  sworddragon at ubuntu:~$ exec '/wine/drive_c/Program Files (x86)/Steam/Steam.exe'
  bash: /wine/drive_c/Program Files (x86)/Steam/Steam.exe: cannot execute binary file: Exec format error
  bash: /wine/drive_c/Program Files (x86)/Steam/Steam.exe: Success

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