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authorFlorian Weimer <fweimer@redhat.com>2017-12-05 15:20:30 +0100
committerFlorian Weimer <fweimer@redhat.com>2017-12-05 15:20:35 +0100
commit446d22e91d3113be57a4b0d1151cf337458c3bec (patch)
tree933a5832d0cbd3aed24a722f1b28a6aefd95fb6c /support/xsignal.h
parentda616c1496e2bd3022dbe4afdd162a80731c08ad (diff)
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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 'support/xsignal.h')
-rw-r--r--support/xsignal.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/support/xsignal.h b/support/xsignal.h
index 3dc0d9d5ce..3087ed0082 100644
--- a/support/xsignal.h
+++ b/support/xsignal.h
@@ -24,6 +24,14 @@
 
 __BEGIN_DECLS
 
+/* The following functions call the corresponding libc functions and
+   terminate the process on error.  */
+
+void xraise (int sig);
+sighandler_t xsignal (int sig, sighandler_t handler);
+void xsigaction (int sig, const struct sigaction *newact,
+                 struct sigaction *oldact);
+
 /* The following functions call the corresponding libpthread functions
    and terminate the process on error.  */