Commit 31e62c2ebbfd for kernel

commit 31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed May 13 11:37:18 2026 -0700

    ptrace: slightly saner 'get_dumpable()' logic

    The 'dumpability' of a task is fundamentally about the memory image of
    the task - the concept comes from whether it can core dump or not - and
    makes no sense when you don't have an associated mm.

    And almost all users do in fact use it only for the case where the task
    has a mm pointer.

    But we have one odd special case: ptrace_may_access() uses 'dumpable' to
    check various other things entirely independently of the MM (typically
    explicitly using flags like PTRACE_MODE_READ_FSCREDS).  Including for
    threads that no longer have a VM (and maybe never did, like most kernel
    threads).

    It's not what this flag was designed for, but it is what it is.

    The ptrace code does check that the uid/gid matches, so you do have to
    be uid-0 to see kernel thread details, but this means that the
    traditional "drop capabilities" model doesn't make any difference for
    this all.

    Make it all make a *bit* more sense by saying that if you don't have a
    MM pointer, we'll use a cached "last dumpability" flag if the thread
    ever had a MM (it will be zero for kernel threads since it is never
    set), and require a proper CAP_SYS_PTRACE capability to override.

    Reported-by: Qualys Security Advisory <qsa@qualys.com>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Kees Cook <kees@kernel.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 368c7b4d7cb5..ee06cba5c6f5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1002,6 +1002,9 @@ struct task_struct {
 	unsigned			sched_rt_mutex:1;
 #endif

+	/* Save user-dumpable when mm goes away */
+	unsigned			user_dumpable:1;
+
 	/* Bit to tell TOMOYO we're in execve(): */
 	unsigned			in_execve:1;
 	unsigned			in_iowait:1;
diff --git a/kernel/exit.c b/kernel/exit.c
index 9a909993ab1d..f50d73c272d6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -571,6 +571,7 @@ static void exit_mm(void)
 	 */
 	smp_mb__after_spinlock();
 	local_irq_disable();
+	current->user_dumpable = (get_dumpable(mm) == SUID_DUMP_USER);
 	current->mm = NULL;
 	membarrier_update_current_mm(NULL);
 	enter_lazy_tlb(mm, current);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 68c17daef8d4..130043bfc209 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -272,11 +272,24 @@ static bool ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
 	return ns_capable(ns, CAP_SYS_PTRACE);
 }

+static bool task_still_dumpable(struct task_struct *task, unsigned int mode)
+{
+	struct mm_struct *mm = task->mm;
+	if (mm) {
+		if (get_dumpable(mm) == SUID_DUMP_USER)
+			return true;
+		return ptrace_has_cap(mm->user_ns, mode);
+	}
+
+	if (task->user_dumpable)
+		return true;
+	return ptrace_has_cap(&init_user_ns, mode);
+}
+
 /* Returns 0 on success, -errno on denial. */
 static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
 {
 	const struct cred *cred = current_cred(), *tcred;
-	struct mm_struct *mm;
 	kuid_t caller_uid;
 	kgid_t caller_gid;

@@ -337,11 +350,8 @@ static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
 	 * Pairs with a write barrier in commit_creds().
 	 */
 	smp_rmb();
-	mm = task->mm;
-	if (mm &&
-	    ((get_dumpable(mm) != SUID_DUMP_USER) &&
-	     !ptrace_has_cap(mm->user_ns, mode)))
-	    return -EPERM;
+	if (!task_still_dumpable(task, mode))
+		return -EPERM;

 	return security_ptrace_access_check(task, mode);
 }