diff options
| -rw-r--r-- | libdiskfs/file-exec.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/libdiskfs/file-exec.c b/libdiskfs/file-exec.c index 521f3528..451854ab 100644 --- a/libdiskfs/file-exec.c +++ b/libdiskfs/file-exec.c @@ -1,5 +1,5 @@ -/* - Copyright (C) 1993, 94, 95, 96, 97, 98 Free Software Foundation, Inc. +/* File execution (file_exec RPC) for diskfs servers, using exec server. + Copyright (C) 1993,94,95,96,97,98,2000 Free Software Foundation, Inc. This file is part of the GNU Hurd. @@ -132,7 +132,18 @@ diskfs_S_file_exec (struct protid *cred, #endif if (! err) - err = diskfs_create_protid (diskfs_make_peropen (np, O_READ, cred->po), + /* Make a new peropen for the exec server to access the file, since any + seeking the exec server might want to do should not affect the + original peropen on which file_exec was called. (The new protid for + this peropen clones the caller's iouser to preserve the caller's + authentication credentials.) The new peropen's openmodes must have + O_READ even if the caller had only O_EXEC privilege, so the exec + server can read the executable file. We also include O_EXEC so that + the exec server can turn this peropen into a file descriptor in the + target process and permit it to exec its /dev/fd/N pseudo-file. */ + err = diskfs_create_protid (diskfs_make_peropen (np, + O_READ|O_EXEC, + cred->po), cred->user, &newpi); if (! err) |