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[PATCH] sanitize handling of shared descriptor tables in failing execve()

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* unshare_files() can fail; doing it after irreversible actions is wrong
  and de_thread() is certainly irreversible.
* since we do it unconditionally anyway, we might as well do it in do_execve()
  and save ourselves the PITA in binfmt handlers, etc.
* while we are at it, binfmt_som actually leaked files_struct on failure.

As a side benefit, unshare_files(), put_files_struct() and reset_files_struct()
become unexported.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2008-04-22 05:11:59 -04:00
parent 6b335d9c80
commit fd8328be87
6 changed files with 20 additions and 70 deletions
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fs/binfmt_som.c
-10
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@@ -194,7 +194,6 @@ load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
unsigned long som_entry;
struct som_hdr *som_ex;
struct som_exec_auxhdr *hpuxhdr;
struct files_struct *files;
/* Get the exec-header */
som_ex = (struct som_hdr *) bprm->buf;
@@ -221,15 +220,6 @@ load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
goto out_free;
}
files = current->files; /* Refcounted so ok */
retval = unshare_files();
if (retval < 0)
goto out_free;
if (files == current->files) {
put_files_struct(files);
files = NULL;
}
retval = get_unused_fd();
if (retval < 0)
goto out_free;