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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | CAVEATS | SEE ALSO | COLOPHON |
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PR_PAC_RESET_KEYS(2const) PR_PAC_RESET_KEYS(2const)
PR_PAC_RESET_KEYS - reset the calling thread's pointer
authentication code keys
Standard C library (libc, -lc)
#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>
int prctl(PR_PAC_RESET_KEYS, unsigned long keys, 0L, 0L, 0L);
Securely reset the thread's pointer authentication keys to fresh
random values generated by the kernel.
The set of keys to be reset is specified by keys, which must be a
logical OR of zero or more of the following:
PR_PAC_APIAKEY
instruction authentication key A
PR_PAC_APIBKEY
instruction authentication key B
PR_PAC_APDAKEY
data authentication key A
PR_PAC_APDBKEY
data authentication key B
PR_PAC_APGAKEY
generic authentication “A” key.
(Yes folks, there really is no generic B key.)
As a special case, if keys is zero, then all the keys are reset.
Since new keys could be added in future, this is the recommended
way to completely wipe the existing keys when establishing a clean
execution context.
There is no need to use PR_PAC_RESET_KEYS in preparation for
calling execve(2), since execve(2) resets all the pointer
authentication keys.
On success, 0 is returned. On error, -1 is returned, and errno is
set to indicate the error.
EINVAL keys contains set bits that are invalid or unsupported on
this platform.
Linux. arm64 only.
Linux 5.0 (arm64).
Because the compiler or run-time environment may be using some or
all of the keys, a successful PR_PAC_RESET_KEYS may crash the
calling process. The conditions for using it safely are complex
and system-dependent. Don't use it unless you know what you are
doing.
prctl(2)
For more information, see the kernel source file
Documentation/arm64/pointer-authentication.rst (or
Documentation/arm64/pointer-authentication.txt before Linux 5.3).
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 PR_PAC_RESET_KEYS(2const)
Pages that refer to this page: prctl(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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