breeze/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-01-25 15:03:52 +08:00
Code Issues Packages Projects Releases Wiki Activity

copy_process: pass clone_flags as u64 across calltree

Browse Source 
With the introduction of clone3 in commit 7f192e3cd3 ("fork: add
clone3") the effective bit width of clone_flags on all architectures was
increased from 32-bit to 64-bit, with a new type of u64 for the flags.
However, for most consumers of clone_flags the interface was not
changed from the previous type of unsigned long.

While this works fine as long as none of the new 64-bit flag bits
(CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
undesirable in terms of the principle of least surprise.

Thus, this commit fixes all relevant interfaces of callees to
sys_clone3/copy_process (excluding the architecture-specific
copy_thread) to consistently pass clone_flags as u64, so that
no truncation to 32-bit integers occurs on 32-bit architectures.

Signed-off-by: Simon Schuster <schuster.simon@siemens-energy.com>
Link: https://lore.kernel.org/20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Simon Schuster
2025-09-01 15:09:51 +02:00
committed by Christian Brauner
parent 04ff48239f
commit edd3cb05c0
38 changed files with 59 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/trace/events/task.h
View File

@@ -8,14 +8,14 @@
TRACE_EVENT(task_newtask,
TP_PROTO(struct task_struct *task, unsigned long clone_flags),
TP_PROTO(struct task_struct *task, u64 clone_flags),
TP_ARGS(task, clone_flags),
TP_STRUCT__entry(
__field( pid_t, pid)
__array( char, comm, TASK_COMM_LEN)
__field( unsigned long, clone_flags)
__field( u64, clone_flags)
__field( short, oom_score_adj)
),
@@ -26,7 +26,7 @@ TRACE_EVENT(task_newtask,
__entry->oom_score_adj = task->signal->oom_score_adj;
),
TP_printk("pid=%d comm=%s clone_flags=%lx oom_score_adj=%hd",
TP_printk("pid=%d comm=%s clone_flags=%llx oom_score_adj=%hd",
__entry->pid, __entry->comm,
__entry->clone_flags, __entry->oom_score_adj)
);