Hey Linus,
/* Summary */
This adds a copy_struct_to_user() helper which is a companion helper to
the already widely used copy_struct_from_user().
It copies a struct from kernel space to userspace, in a way that
guarantees backwards-compatibility for struct syscall arguments as long
as future struct extensions are made such that all new fields are
appended to the old struct, and zeroed-out new fields have the same
meaning as the old struct.
The first user is sched_getattr() system call but once the pidfs updates
for this cycle have landed the new extensible ioctl will be ported to it
as well.
/* Testing */
gcc version 14.2.0 (Debian 14.2.0-6)
Debian clang version 16.0.6 (27+b1)
All patches are based on v6.12-rc3 and have been sitting in linux-next.
No build failures or warnings were observed.
/* Conflicts */
Merge conflicts with mainline
=============================
No known conflicts.
Merge conflicts with other trees
================================
No known conflicts.
The following changes since commit 8e929cb546ee42c9a61d24fae60605e9e3192354:
Linux 6.12-rc3 (2024-10-13 14:33:32 -0700)
are available in the Git repository at:
git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.13.usercopy
for you to fetch changes up to 112cca098a7010c02a4d535a253af72e4e5bbd06:
sched_getattr: port to copy_struct_to_user (2024-10-21 16:51:31 +0200)
Please consider pulling these changes from the signed vfs-6.13.usercopy tag.
Thanks!
Christian
----------------------------------------------------------------
vfs-6.13.usercopy
----------------------------------------------------------------
Aleksa Sarai (2):
uaccess: add copy_struct_to_user helper
sched_getattr: port to copy_struct_to_user
include/linux/uaccess.h | 97 +++++++++++++++++++++++++++++++++++++++++++++++++
kernel/sched/syscalls.c | 42 +--------------------
2 files changed, 99 insertions(+), 40 deletions(-)
