Now that Lorenzo cleaned things up and made the FOLL_FORCE users
explicit, it becomes obvious how some of them don't really need
FOLL_FORCE at all.
So remove FOLL_FORCE from the proc code that reads the command line and
arguments from user space.
The mem_rw() function actually does want FOLL_FORCE, because gdd (and
possibly many other debuggers) use it as a much more convenient version
of PTRACE_PEEKDATA, but we should consider making the FOLL_FORCE part
conditional on actually being a ptracer. This does not actually do
that, just moves adds a comment to that effect and moves the gup_flags
settings next to each other.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Inherently racy -- command line shares address space
* with code and data.
*/
* Inherently racy -- command line shares address space
* with code and data.
*/
- rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_FORCE);
+ rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0);
if (rv <= 0)
goto out_free_page;
if (rv <= 0)
goto out_free_page;
int nr_read;
_count = min3(count, len, PAGE_SIZE);
int nr_read;
_count = min3(count, len, PAGE_SIZE);
- nr_read = access_remote_vm(mm, p, page, _count,
- FOLL_FORCE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
bool final;
_count = min3(count, len, PAGE_SIZE);
bool final;
_count = min3(count, len, PAGE_SIZE);
- nr_read = access_remote_vm(mm, p, page, _count,
- FOLL_FORCE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
bool final;
_count = min3(count, len, PAGE_SIZE);
bool final;
_count = min3(count, len, PAGE_SIZE);
- nr_read = access_remote_vm(mm, p, page, _count,
- FOLL_FORCE);
+ nr_read = access_remote_vm(mm, p, page, _count, 0);
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
if (nr_read < 0)
rv = nr_read;
if (nr_read <= 0)
unsigned long addr = *ppos;
ssize_t copied;
char *page;
unsigned long addr = *ppos;
ssize_t copied;
char *page;
- unsigned int flags = FOLL_FORCE;
if (!atomic_inc_not_zero(&mm->mm_users))
goto free;
if (!atomic_inc_not_zero(&mm->mm_users))
goto free;
+ /* Maybe we should limit FOLL_FORCE to actual ptrace users? */
+ flags = FOLL_FORCE;
if (write)
flags |= FOLL_WRITE;
if (write)
flags |= FOLL_WRITE;
max_len = min_t(size_t, PAGE_SIZE, count);
this_len = min(max_len, this_len);
max_len = min_t(size_t, PAGE_SIZE, count);
this_len = min(max_len, this_len);
- retval = access_remote_vm(mm, (env_start + src),
- page, this_len, FOLL_FORCE);
+ retval = access_remote_vm(mm, (env_start + src), page, this_len, 0);
if (retval <= 0) {
ret = retval;
if (retval <= 0) {
ret = retval;