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mm: replace access_process_vm() write parameter with gup_flags

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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 <[email protected]>
Acked-by: Jesper Nilsson <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lorenzo Stoakes 2016-10-13 01:20:20 +01:00 • committed by Linus Torvalds
commit f307ab6dce
17 changed files with 84 additions and 54 deletions
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5
mm/util.c
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@ -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);
}
}