linux/arch/parisc
Linus Torvalds c4ad8f98be execve: use 'struct filename *' for executable name passing
This changes 'do_execve()' to get the executable name as a 'struct
filename', and to free it when it is done.  This is what the normal
users want, and it simplifies and streamlines their error handling.

The controlled lifetime of the executable name also fixes a
use-after-free problem with the trace_sched_process_exec tracepoint: the
lifetime of the passed-in string for kernel users was not at all
obvious, and the user-mode helper code used UMH_WAIT_EXEC to serialize
the pathname allocation lifetime with the execve() having finished,
which in turn meant that the trace point that happened after
mm_release() of the old process VM ended up using already free'd memory.

To solve the kernel string lifetime issue, this simply introduces
"getname_kernel()" that works like the normal user-space getname()
function, except with the source coming from kernel memory.

As Oleg points out, this also means that we could drop the tcomm[] array
from 'struct linux_binprm', since the pathname lifetime now covers
setup_new_exec().  That would be a separate cleanup.

Reported-by: Igor Zhbanov <i.zhbanov@samsung.com>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-05 12:54:53 -08:00
..
configs parisc: update 64bit defconfigs and use SIL680 instead of SIIMAGE driver 2013-12-03 23:23:35 +01:00
hpux execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
include parisc: add flexible mmap memory layout support 2014-02-02 21:00:13 +01:00
kernel parisc: add flexible mmap memory layout support 2014-02-02 21:00:13 +01:00
lib parisc: size_t is unsigned, so comparison size < 0 doesn't make sense. 2013-11-20 00:09:42 +01:00
math-emu parisc: remove duplicate define 2013-11-07 22:28:15 +01:00
mm mm, show_mem: remove SHOW_MEM_FILTER_PAGE_COUNT 2014-01-21 16:19:44 -08:00
oprofile oprofile: more whitespace fixes 2008-10-15 20:55:51 +02:00
Kconfig Kconfig: update flightly outdated CONFIG_SMP documentation 2014-01-23 16:37:01 -08:00
Kconfig.debug consolidate per-arch stack overflow debugging options 2013-07-04 11:25:39 -07:00
Makefile parisc: make "make install" not depend on vmlinux 2013-11-07 22:28:06 +01:00
defpalo.conf parisc: switch to gzip-compressed vmlinuz kernel 2013-07-09 22:09:20 +02:00
install.sh parisc: make "make install" not depend on vmlinux 2013-11-07 22:28:06 +01:00
nm