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| author | Florian Weimer <fweimer@redhat.com> | 2017-12-05 15:20:30 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2017-12-05 15:20:35 +0100 |
| commit | 446d22e91d3113be57a4b0d1151cf337458c3bec (patch) | |
| tree | 933a5832d0cbd3aed24a722f1b28a6aefd95fb6c /NEWS | |
| parent | da616c1496e2bd3022dbe4afdd162a80731c08ad (diff) | |
| download | glibc-446d22e91d3113be57a4b0d1151cf337458c3bec.zip glibc-446d22e91d3113be57a4b0d1151cf337458c3bec.tar.gz glibc-446d22e91d3113be57a4b0d1151cf337458c3bec.tar.bz2 | |
Linux: Implement interfaces for memory protection keys
This adds system call wrappers for pkey_alloc, pkey_free, pkey_mprotect,
and x86-64 implementations of pkey_get and pkey_set, which abstract over
the PKRU CPU register and hide the actual number of memory protection
keys supported by the CPU. pkey_mprotect with a -1 key is implemented
using mprotect, so it will work even if the kernel does not support the
pkey_mprotect system call.
The system call wrapers use unsigned int instead of unsigned long for
parameters, so that no special treatment for x32 is needed. The flags
argument is currently unused, and the access rights bit mask is limited
to two bits by the current PKRU register layout anyway.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 4 |
1 files changed, 4 insertions, 0 deletions
@@ -43,6 +43,10 @@ Major new features: * glibc now implements the memfd_create and mlock2 functions on Linux. +* Support for memory protection keys was added. The <sys/mman.h> header now + declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set, + pkey_get. + Deprecated and removed features, and other changes affecting compatibility: * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer |