Merge branch 'fixes-for-v4.9-rc2' of http://git.agner.ch/git/linux-drm-fsl-dcu into...

[cascardo/linux.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index c2964d8..8e65446 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -252,7 +252,7 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
         * Inherently racy -- command line shares address space
         * with code and data.
         */
-       rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0);
+       rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_FORCE);
        if (rv <= 0)
                goto out_free_page;
 
@@ -270,7 +270,8 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
                        int nr_read;
 
                        _count = min3(count, len, PAGE_SIZE);
-                       nr_read = access_remote_vm(mm, p, page, _count, 0);
+                       nr_read = access_remote_vm(mm, p, page, _count,
+                                       FOLL_FORCE);
                        if (nr_read < 0)
                                rv = nr_read;
                        if (nr_read <= 0)
@@ -305,7 +306,8 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
                        bool final;
 
                        _count = min3(count, len, PAGE_SIZE);
-                       nr_read = access_remote_vm(mm, p, page, _count, 0);
+                       nr_read = access_remote_vm(mm, p, page, _count,
+                                       FOLL_FORCE);
                        if (nr_read < 0)
                                rv = nr_read;
                        if (nr_read <= 0)
@@ -354,7 +356,8 @@ skip_argv:
                        bool final;
 
                        _count = min3(count, len, PAGE_SIZE);
-                       nr_read = access_remote_vm(mm, p, page, _count, 0);
+                       nr_read = access_remote_vm(mm, p, page, _count,
+                                       FOLL_FORCE);
                        if (nr_read < 0)
                                rv = nr_read;
                        if (nr_read <= 0)
@@ -832,6 +835,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
        unsigned long addr = *ppos;
        ssize_t copied;
        char *page;
+       unsigned int flags = FOLL_FORCE;
 
        if (!mm)
                return 0;
@@ -844,6 +848,9 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
        if (!atomic_inc_not_zero(&mm->mm_users))
                goto free;
 
+       if (write)
+               flags |= FOLL_WRITE;
+
        while (count > 0) {
                int this_len = min_t(int, count, PAGE_SIZE);
 
@@ -852,7 +859,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf,
                        break;
                }
 
-               this_len = access_remote_vm(mm, addr, page, this_len, write);
+               this_len = access_remote_vm(mm, addr, page, this_len, flags);
                if (!this_len) {
                        if (!copied)
                                copied = -EIO;
@@ -965,7 +972,7 @@ static ssize_t environ_read(struct file *file, char __user *buf,
                this_len = min(max_len, this_len);
 
                retval = access_remote_vm(mm, (env_start + src),
-                       page, this_len, 0);
+                       page, this_len, FOLL_FORCE);
 
                if (retval <= 0) {
                        ret = retval;