On Wed, 3 Oct 2007 15:46:32 +0200 (MEST) Mikael Pettersson <[EMAIL PROTECTED]> wrote: > The proposed kernel signal delivery patch only handles the case > where the /sigframe/ ends up overlapping the end of the altstack. > If the sigframe remains within the altstack boundaries but the > user-space signal handler adds an /ordinary stack frame/ that > moves SP beyond the altstack limit, then the kernel patch solves > nothing and recursive signals will cause altstack wraparound. > > On the other hand, the user-space technique of making the lowest > page(s) in the altstack inaccessible handles both cases of overflow. > Hmm, okay. Then, this fix is not enough. I see. I'll consider how to eduacate users.
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