BACKPORT: Sanitize 'move_pages()' permission checks

The 'move_paghes()' system call was introduced long long ago with the
same permission checks as for sending a signal (except using
CAP_SYS_NICE instead of CAP_SYS_KILL for the overriding capability).

That turns out to not be a great choice - while the system call really
only moves physical page allocations around (and you need other
capabilities to do a lot of it), you can check the return value to map
out some the virtual address choices and defeat ASLR of a binary that
still shares your uid.

So change the access checks to the more common 'ptrace_may_access()'
model instead.

This tightens the access checks for the uid, and also effectively
changes the CAP_SYS_NICE check to CAP_SYS_PTRACE, but it's unlikely that
anybody really _uses_ this legacy system call any more (we hav ebetter
NUMA placement models these days), so I expect nobody to notice.

Famous last words.

Reported-by: Otto Ebeling <otto.ebeling@iki.fi>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: stable@kernel.org
Bug: 65468230
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
cherry-picked from: 197e7e521384a23b9e585178f3f11c9fa08274b9

This branch does not have the PTRACE_MODE_REALCREDS flag but its
default behavior is the same as PTRACE_MODE_REALCREDS. So use
PTRACE_MODE_READ instead of PTRACE_MODE_READ_REALCREDS.

Change-Id: I75364561d91155c01f78dd62cdd41c5f0f418854

diff --git a/mm/migrate.c b/mm/migrate.c
index a61500f2671fb27f664530b08fe2d371baeee677..67a8b05ef36df022b9cea5e998070a11b29aae33 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -37,6 +37,7 @@
 #include <linux/hugetlb_cgroup.h>
 #include <linux/gfp.h>
 #include <linux/balloon_compaction.h>
+#include <linux/ptrace.h>
 
 #include <asm/tlbflush.h>
 
@@ -1380,7 +1381,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
                const int __user *, nodes,
                int __user *, status, int, flags)
 {
-       const struct cred *cred = current_cred(), *tcred;
        struct task_struct *task;
        struct mm_struct *mm;
        int err;
@@ -1404,14 +1404,9 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
 
        /*
         * Check if this process has the right to modify the specified
-        * process. The right exists if the process has administrative
-        * capabilities, superuser privileges or the same
-        * userid as the target process.
+        * process. Use the regular "ptrace_may_access()" checks.
         */
-       tcred = __task_cred(task);
-       if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) &&
-           !uid_eq(cred->uid,  tcred->suid) && !uid_eq(cred->uid,  tcred->uid) &&
-           !capable(CAP_SYS_NICE)) {
+       if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
                rcu_read_unlock();
                err = -EPERM;
                goto out;