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authorAl Viro <viro@zeniv.linux.org.uk>2008-04-22 13:11:59 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-25 17:23:53 +0400
commitfd8328be874f4190a811c58cd4778ec2c74d2c05 (patch)
treeb44ae8e99ce96a1a4739b04d4d1a23c40ab8b163 /fs/binfmt_misc.c
parent6b335d9c80d7f3c2a3f6545f664ae9007a0f3821 (diff)
downloadlinux-fd8328be874f4190a811c58cd4778ec2c74d2c05.tar.xz
[PATCH] sanitize handling of shared descriptor tables in failing execve()
* 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>
Diffstat (limited to 'fs/binfmt_misc.c')
-rw-r--r--fs/binfmt_misc.c18
1 files changed, 1 insertions, 17 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index b53c7e5f41bb..dbf0ac0523de 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -110,7 +110,6 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
char *iname_addr = iname;
int retval;
int fd_binary = -1;
- struct files_struct *files = NULL;
retval = -ENOEXEC;
if (!enabled)
@@ -133,21 +132,13 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
if (fmt->flags & MISC_FMT_OPEN_BINARY) {
- files = current->files;
- retval = unshare_files();
- if (retval < 0)
- goto _ret;
- if (files == current->files) {
- put_files_struct(files);
- files = NULL;
- }
/* if the binary should be opened on behalf of the
* interpreter than keep it open and assign descriptor
* to it */
fd_binary = get_unused_fd();
if (fd_binary < 0) {
retval = fd_binary;
- goto _unshare;
+ goto _ret;
}
fd_install(fd_binary, bprm->file);
@@ -205,10 +196,6 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
if (retval < 0)
goto _error;
- if (files) {
- put_files_struct(files);
- files = NULL;
- }
_ret:
return retval;
_error:
@@ -216,9 +203,6 @@ _error:
sys_close(fd_binary);
bprm->interp_flags = 0;
bprm->interp_data = 0;
-_unshare:
- if (files)
- reset_files_struct(current, files);
goto _ret;
}