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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 /arch/alpha
parent6347e8d5bcce33fc36e651901efefbe2c93a43ef (diff)
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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 'arch/alpha')
-rw-r--r--arch/alpha/kernel/ptrace.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/alpha/kernel/ptrace.c b/arch/alpha/kernel/ptrace.c
index d9ee81769899..940dfb406591 100644
--- a/arch/alpha/kernel/ptrace.c
+++ b/arch/alpha/kernel/ptrace.c
@@ -157,14 +157,16 @@ put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
static inline int
read_int(struct task_struct *task, unsigned long addr, int * data)
{
- int copied = access_process_vm(task, addr, data, sizeof(int), 0);
+ int copied = access_process_vm(task, addr, data, sizeof(int),
+ FOLL_FORCE);
return (copied == sizeof(int)) ? 0 : -EIO;
}
static inline int
write_int(struct task_struct *task, unsigned long addr, int data)
{
- int copied = access_process_vm(task, addr, &data, sizeof(int), 1);
+ int copied = access_process_vm(task, addr, &data, sizeof(int),
+ FOLL_FORCE | FOLL_WRITE);
return (copied == sizeof(int)) ? 0 : -EIO;
}
@@ -281,7 +283,8 @@ long arch_ptrace(struct task_struct *child, long request,
/* When I and D space are separate, these will need to be fixed. */
case PTRACE_PEEKTEXT: /* read word at location addr. */
case PTRACE_PEEKDATA:
- copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp),
+ FOLL_FORCE);
ret = -EIO;
if (copied != sizeof(tmp))
break;