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authorAl Viro <viro@zeniv.linux.org.uk>2008-04-22 05:31:30 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-25 09:23:59 -0400
commit3b1253880b7a9e6db54b943b2d40bcf2202f58ab (patch)
tree5301be7b4d4310faa8db5a0d027b81421e36570e /fs/exec.c
parentfd8328be874f4190a811c58cd4778ec2c74d2c05 (diff)
downloadop-kernel-dev-3b1253880b7a9e6db54b943b2d40bcf2202f58ab.zip
op-kernel-dev-3b1253880b7a9e6db54b943b2d40bcf2202f58ab.tar.gz
[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.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 4755430..b152029 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;
}
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