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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/xunistd.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/xunistd.h')
-rw-r--r--support/xunistd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/support/xunistd.h b/support/xunistd.h
index 05c2626..00376f7 100644
--- a/support/xunistd.h
+++ b/support/xunistd.h
@@ -39,6 +39,7 @@ void xstat (const char *path, struct stat64 *);
void xmkdir (const char *path, mode_t);
void xchroot (const char *path);
void xunlink (const char *path);
+long xsysconf (int name);
/* Read the link at PATH. The caller should free the returned string
with free. */