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Support AT_FXRNG and AT_KPRELOAD on FreeBSD.

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FreeBSD's kernel has recently added two new ELF auxiliary vector
entries.  AT_FXRNG points to a root seed version for the kernel's
PRNG.  Userland can use this to reseed a userland PRNG after the
kernel's PRNG has reseeded.  AT_KPRELOAD is the base address of a
kernel-provided vDSO.

This change displays the proper name and description of these entries
in 'info auxv'.

include/ChangeLog:

	* elf/common.h (AT_FREEBSD_FXRNG, AT_FREEBSD_KPRELOAD): Define.
This commit is contained in:
John Baldwin
2021-12-07 10:29:01 -08:00
parent c5a9fcdfee
commit b4992e9990
3 changed files with 8 additions and 0 deletions
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2
gdb/fbsd-tdep.c
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@ -1565,6 +1565,8 @@ fbsd_print_auxv_entry (struct gdbarch *gdbarch, struct ui_file *file,
TAG (ENVC, _("Environment count"), AUXV_FORMAT_DEC);
TAG (ENVV, _("Environment vector"), AUXV_FORMAT_HEX);
TAG (PS_STRINGS, _("Pointer to ps_strings"), AUXV_FORMAT_HEX);
TAG (FXRNG, _("Pointer to root RNG seed version"), AUXV_FORMAT_HEX);
TAG (KPRELOAD, _("Base address of vDSO"), AUXV_FORMAT_HEX);
}
fprint_auxv_entry (file, name, description, format, type, val);

4
include/ChangeLog
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@ -1,3 +1,7 @@
2021-12-07 John Baldwin <jhb@FreeBSD.org>
* elf/common.h (AT_FREEBSD_FXRNG, AT_FREEBSD_KPRELOAD): Define.
2021-12-01 Nick Clifton <nickc@redhat.com>
PR 28630

2
include/elf/common.h
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@ -1392,6 +1392,8 @@
#define AT_FREEBSD_ENVC 30 /* Environment count. */
#define AT_FREEBSD_ENVV 31 /* Environment vvector. */
#define AT_FREEBSD_PS_STRINGS 32 /* struct ps_strings. */
#define AT_FREEBSD_FXRNG 33 /* Pointer to root RNG seed version. */
#define AT_FREEBSD_KPRELOAD 34 /* Base of vdso. */
#define AT_SUN_UID 2000 /* Effective user ID. */
#define AT_SUN_RUID 2001 /* Real user ID. */