diff options
| author | David S. Miller <davem@davemloft.net> | 2016-10-30 12:42:58 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-30 12:42:58 -0400 |
| commit | 27058af401e49d88a905df000dd26f443fcfa8ce (patch) | |
| tree | 819f32113d3b8374b9fbf72e2202d4c4d4511a60 /fs/proc/base.c | |
| parent | 357f4aae859b5d74554b0ccbb18556f1df4166c3 (diff) | |
| parent | 2a26d99b251b8625d27aed14e97fc10707a3a81f (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Mostly simple overlapping changes.
For example, David Ahern's adjacency list revamp in 'net-next'
conflicted with an adjacency list traversal bug fix in 'net'.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index c2964d890c9a..ca651ac00660 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -832,6 +832,7 @@ static ssize_t mem_rw(struct file *file, char __user *buf, unsigned long addr = *ppos; ssize_t copied; char *page; + unsigned int flags; if (!mm) return 0; @@ -844,6 +845,11 @@ static ssize_t mem_rw(struct file *file, char __user *buf, 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; + while (count > 0) { int this_len = min_t(int, count, PAGE_SIZE); @@ -852,7 +858,7 @@ 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; @@ -964,8 +970,7 @@ static ssize_t environ_read(struct file *file, char __user *buf, 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, 0); + retval = access_remote_vm(mm, (env_start + src), page, this_len, 0); if (retval <= 0) { ret = retval; @@ -1007,6 +1012,9 @@ static ssize_t auxv_read(struct file *file, char __user *buf, { struct mm_struct *mm = file->private_data; unsigned int nwords = 0; + + if (!mm) + return 0; do { nwords += 2; } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |