diff options
Diffstat (limited to 'lib/libc/sys/execve.2')
| -rw-r--r-- | lib/libc/sys/execve.2 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/libc/sys/execve.2 b/lib/libc/sys/execve.2 index de7a0dc8ee2..023d232d499 100644 --- a/lib/libc/sys/execve.2 +++ b/lib/libc/sys/execve.2 @@ -115,6 +115,13 @@ and .Xr fcntl 2 ) . Descriptors that remain open are unaffected by .Fn execve . +In the case of a new setuid or setgid executable being executed, if +file descriptors 0, 1, or 2 (representing stdin, stdout, and stderr) +are currently unallocated, these descriptors will be opened to point to +some system file like +.Pa /dev/null . +The intent is to ensure these descriptors are not unallocated, since +many libraries make assumptions about the use of these 3 file descriptors. .Pp Signals set to be ignored in the calling process are set to be ignored in the |