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| author | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-22 05:31:30 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-04-25 09:23:59 -0400 |
| commit | 3b1253880b7a9e6db54b943b2d40bcf2202f58ab (patch) | |
| tree | 5301be7b4d4310faa8db5a0d027b81421e36570e /fs/exec.c | |
| parent | fd8328be874f4190a811c58cd4778ec2c74d2c05 (diff) | |
| download | linux-3b1253880b7a9e6db54b943b2d40bcf2202f58ab.tar.bz2 | |
[PATCH] sanitize unshare_files/reset_files_struct
* let unshare_files() give caller the displaced files_struct
* don't bother with grabbing reference only to drop it in the
caller if it hadn't been shared in the first place
* in that form unshare_files() is trivially implemented via
unshare_fd(), so we eliminate the duplicate logics in fork.c
* reset_files_struct() is not just only called for current;
it will break the system if somebody ever calls it for anything
else (we can't modify ->files of somebody else). Lose the
task_struct * argument.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/fs/exec.c b/fs/exec.c index 475543002f13..b152029f18f6 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1269,19 +1269,13 @@ int do_execve(char * filename, struct linux_binprm *bprm; struct file *file; unsigned long env_p; - struct files_struct *files; + struct files_struct *displaced; int retval; - files = current->files; - retval = unshare_files(); + retval = unshare_files(&displaced); if (retval) goto out_ret; - if (files == current->files) { - put_files_struct(files); - files = NULL; - } - retval = -ENOMEM; bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); if (!bprm) @@ -1340,8 +1334,8 @@ int do_execve(char * filename, security_bprm_free(bprm); acct_update_integrals(current); kfree(bprm); - if (files) - put_files_struct(files); + if (displaced) + put_files_struct(displaced); return retval; } @@ -1363,8 +1357,8 @@ out_kfree: kfree(bprm); out_files: - if (files) - reset_files_struct(current, files); + if (displaced) + reset_files_struct(displaced); out_ret: return retval; } |