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authorLorenzo Stoakes <lstoakes@gmail.com>2016-10-13 01:20:20 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-19 08:31:25 -0700
commitf307ab6dcea03f9d8e4d70508fd7d1ca57cfa7f9 (patch)
tree94a96ebae9957cf1252231a69f8904796aa2563e /mm/util.c
parent6347e8d5bcce33fc36e651901efefbe2c93a43ef (diff)
mm: replace access_process_vm() write parameter with gup_flags
This removes the 'write' argument from access_process_vm() and replaces it with 'gup_flags' as use of this function previously silently implied FOLL_FORCE, whereas after this patch callers explicitly pass this flag. We make this explicit as use of FOLL_FORCE can result in surprising behaviour (and hence bugs) within the mm subsystem. Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/util.c b/mm/util.c
index 4c685bde5ebc..952cbe7ad7b7 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -624,7 +624,7 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
if (len > buflen)
len = buflen;
- res = access_process_vm(task, arg_start, buffer, len, 0);
+ res = access_process_vm(task, arg_start, buffer, len, FOLL_FORCE);
/*
* If the nul at the end of args has been overwritten, then
@@ -639,7 +639,8 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
if (len > buflen - res)
len = buflen - res;
res += access_process_vm(task, env_start,
- buffer+res, len, 0);
+ buffer+res, len,
+ FOLL_FORCE);
res = strnlen(buffer, res);
}
}