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446d22e91d
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>
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* POSIX-specific extra functions.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* These wrapper functions use POSIX types and therefore cannot be
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declared in <support/support.h>. */
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#ifndef SUPPORT_XUNISTD_H
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#define SUPPORT_XUNISTD_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <unistd.h>
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__BEGIN_DECLS
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struct stat64;
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pid_t xfork (void);
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pid_t xwaitpid (pid_t, int *status, int flags);
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void xpipe (int[2]);
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void xdup2 (int, int);
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int xopen (const char *path, int flags, mode_t);
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void xstat (const char *path, struct stat64 *);
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void xmkdir (const char *path, mode_t);
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void xchroot (const char *path);
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void xunlink (const char *path);
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long xsysconf (int name);
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/* Read the link at PATH. The caller should free the returned string
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with free. */
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char *xreadlink (const char *path);
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/* Close the file descriptor. Ignore EINTR errors, but terminate the
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process on other errors. */
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void xclose (int);
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/* Write the buffer. Retry on short writes. */
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void xwrite (int, const void *, size_t);
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/* Invoke mmap with a zero file offset. */
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void *xmmap (void *addr, size_t length, int prot, int flags, int fd);
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void xmprotect (void *addr, size_t length, int prot);
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void xmunmap (void *addr, size_t length);
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__END_DECLS
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#endif /* SUPPORT_XUNISTD_H */
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