On Wed, Jan 24, 2007 at 01:09:18AM -0800, [email protected] wrote:
>
> The patch titled
> mm: search_binary_handler() mem limit fix
> has been added to the -mm tree. Its filename is
> mm-search_binary_handler-mem-limit-fix.patch
>
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>
> See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
> out what to do about this
>
> ------------------------------------------------------
> Subject: mm: search_binary_handler() mem limit fix
> From: Dmitriy Monakhov <[email protected]>
>
> The function changes mem limit to USER_DS before possible modprobe, but
> never restored it again.
>
> Signed-off-by: Dmitriy Monakhov <[email protected]>
> Signed-off-by: Andrew Morton <[email protected]>
This patch breaks s390. I haven't yet tried to figure out why, but does this
patch actually fix a real bug?
What happens is that the init process gets killed -> panic.
> fs/exec.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff -puN fs/exec.c~mm-search_binary_handler-mem-limit-fix fs/exec.c
> --- a/fs/exec.c~mm-search_binary_handler-mem-limit-fix
> +++ a/fs/exec.c
> @@ -1018,6 +1018,7 @@ int search_binary_handler(struct linux_b
> {
> int try,retval;
> struct linux_binfmt *fmt;
> + mm_segment_t oldfs;
> #ifdef __alpha__
> /* handle /sbin/loader.. */
> {
> @@ -1059,11 +1060,12 @@ int search_binary_handler(struct linux_b
>
> /* kernel module loader fixup */
> /* so we don't try to load run modprobe in kernel space. */
> + oldfs = get_fs();
> set_fs(USER_DS);
>
> retval = audit_bprm(bprm);
> if (retval)
> - return retval;
> + goto out;
>
> retval = -ENOENT;
> for (try=0; try<2; try++) {
> @@ -1084,7 +1086,7 @@ int search_binary_handler(struct linux_b
> bprm->file = NULL;
> current->did_exec = 1;
> proc_exec_connector(current);
> - return retval;
> + goto out;
> }
> read_lock(&binfmt_lock);
> put_binfmt(fmt);
> @@ -1092,7 +1094,7 @@ int search_binary_handler(struct linux_b
> break;
> if (!bprm->file) {
> read_unlock(&binfmt_lock);
> - return retval;
> + goto out;
> }
> }
> read_unlock(&binfmt_lock);
> @@ -1110,6 +1112,8 @@ int search_binary_handler(struct linux_b
> #endif
> }
> }
> +out:
> + set_fs(oldfs);
> return retval;
> }
-
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