Messages in this thread | ![/](/images/icornerl.gif) | | From | (Eric W. Biederman) | Date | Mon, 03 Aug 2020 15:20:07 -0500 | Subject | [GIT PULL] exec cleanups for v5.9-rc1 |
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Please pull the exec-linus branch from the git tree:
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git exec-linus
HEAD: 7fce69dff8db30cb93aace0bbebda09972027af7 Implement kernel_execve
During the development of v5.7 I ran into bugs and quality of implementation issues related to exec that could not be easily fixed because of the way exec is implemented. So I have been diggin into exec and cleaning up what I can.
This cycle I have been looking at different ideas and different implementations to see what is possible to improve exec, and cleaning the way exec interfaces with in kernel users. Only cleaning up the interfaces of exec with rest of the kernel has managed to stabalize and make it through review in time for v5.9-rc1 resulting in 2 sets of changes this cycle.
Implement kernel_execve Make the user mode driver code a better citizen
With kernel_execve the code size got a little larger as the copying of parameters from userspace and copying of parameters from userspace is now separate. The good news is kernel threads no longer need to play games with set_fs to use exec. Which when combined with the rest of Christophs set_fs changes should security bugs with set_fs much more difficult.
The first changeset "Make the user mode driver code a better citizen" should be both in this tree and in the bpf tree.
This inches the exec code closer to sorting out the long standing issues I am aware of.
After 5.9-rc1 is released I am hoping to quickly rebase and get a lot of changes posted, reviewed and merged. I have a lot of additional fixes and cleanups that just need a little more attention before they are ready to merge.
Eric W. Biederman (25): umh: Capture the pid in umh_pipe_setup umh: Move setting PF_UMH into umh_pipe_setup umh: Rename the user mode driver helpers for clarity umh: Remove call_usermodehelper_setup_file. umh: Separate the user mode driver and the user mode helper support umd: For clarity rename umh_info umd_info umd: Rename umd_info.cmdline umd_info.driver_name umd: Transform fork_usermode_blob into fork_usermode_driver umh: Stop calling do_execve_file exec: Remove do_execve_file bpfilter: Move bpfilter_umh back into init data umd: Track user space drivers with struct pid exit: Factor thread_group_exited out of pidfd_poll bpfilter: Take advantage of the facilities of struct pid umd: Remove exit_umh umd: Stop using split_argv Make the user mode driver code a better citizen exec: Remove unnecessary spaces from binfmts.h exec: Factor out alloc_bprm exec: Move initialization of bprm->filename into alloc_bprm exec: Move bprm_mm_init into alloc_bprm exec: Factor bprm_execve out of do_execve_common exec: Factor bprm_stack_limits out of prepare_arg_pages exec: Implement kernel_execve Implement kernel_execve
arch/x86/entry/entry_32.S | 2 +- arch/x86/entry/entry_64.S | 2 +- arch/x86/kernel/unwind_frame.c | 2 +- fs/exec.c | 307 +++++++++++++++++++++++++-------------- include/linux/binfmts.h | 21 +-- include/linux/bpfilter.h | 7 +- include/linux/sched.h | 9 -- include/linux/sched/signal.h | 2 + include/linux/umh.h | 15 -- include/linux/usermode_driver.h | 18 +++ init/main.c | 4 +- kernel/Makefile | 1 + kernel/exit.c | 25 +++- kernel/fork.c | 6 +- kernel/umh.c | 171 +--------------------- kernel/usermode_driver.c | 182 +++++++++++++++++++++++ net/bpfilter/bpfilter_kern.c | 38 ++--- net/bpfilter/bpfilter_umh_blob.S | 2 +- net/ipv4/bpfilter/sockopt.c | 20 +-- security/tomoyo/common.h | 2 +- security/tomoyo/domain.c | 4 +- security/tomoyo/tomoyo.c | 4 +- 22 files changed, 480 insertions(+), 364 deletions(-)
Eric
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