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Groups > linux.kernel > #1631101
| From | "PaX Team" <pageexec@freemail.hu> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 0/2] x86, refcount: Implement fast refcount overflow |
| Date | 2017-04-26 04:10 +0200 |
| Message-ID | <tAkyZ-4lo-3@gated-at.bofh.it> (permalink) |
| References | <tAhB7-2jd-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 25 Apr 2017 at 15:56, Kees Cook wrote: > This protection is a modified version of the x86 PAX_REFCOUNT > implementation from PaX/grsecurity. This speeds up the refcount_t API by > duplicating the existing atomic_t implementation with a single instruction > added to detect if the refcount has wrapped past INT_MAX (or below 0) > resulting in a signed value. 'signed value' sounds somewhat ambiguous given that in C a signed type (such as the one beneath refcount_t) can have both negative and positive values yet you didn't mean the latter here i guess. > Various differences from PaX: > - uses "js" instead of "jo" to trap all signed results instead of just > under/overflow transitions there're differences in my 4.11 port but this isn't one of them.
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[PATCH v2 0/2] x86, refcount: Implement fast refcount overflow Kees Cook <keescook@chromium.org> - 2017-04-26 01:00 +0200
Re: [PATCH v2 0/2] x86, refcount: Implement fast refcount overflow "PaX Team" <pageexec@freemail.hu> - 2017-04-26 04:10 +0200
Re: [PATCH v2 0/2] x86, refcount: Implement fast refcount overflow Kees Cook <keescook@chromium.org> - 2017-04-26 06:00 +0200
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