Re: [PATCH 1/2] mm: add GFP mask param to strndup_user
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2020-08-15 22:42:24
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linux-api, lkml
On Sat, Aug 15, 2020 at 11:23:43AM -0700, Pascal Bouchareine wrote:
Let caller specify allocation. Preserve existing calls with GFP_USER.
Bloody bad idea, unless you slap a BUG_ON(flags & GFP_ATOMIC) on it, to make sure nobody tries _that_. Note that copying from userland is an inherently blocking operation, and this interface invites just that. What do you need that flag for, anyway?