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add: java-21-openjdk-portable

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Signed-off-by: Owen-sz <owen@fyralabs.com>
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Owen-sz
2026-05-05 22:03:34 -05:00
parent 427177b166
commit 39010e4e76
18 changed files with 12369 additions and 0 deletions
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anda/langs/java/21/java-21-openjdk-portable/alt-java.c
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/*
* Copyright (C) 2023 Red Hat, Inc.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Red Hat designates this
* particular file as subject to the "Classpath" exception as provided
* by Red Hat in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <errno.h>
#include <libgen.h>
#include <linux/limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <unistd.h>
/* Per task speculation control */
#ifndef PR_GET_SPECULATION_CTRL
# define PR_GET_SPECULATION_CTRL 52
#endif
#ifndef PR_SET_SPECULATION_CTRL
# define PR_SET_SPECULATION_CTRL 53
#endif
/* Speculation control variants */
#ifndef PR_SPEC_STORE_BYPASS
# define PR_SPEC_STORE_BYPASS 0
#endif
/* Return and control values for PR_SET/GET_SPECULATION_CTRL */
#ifndef PR_SPEC_NOT_AFFECTED
# define PR_SPEC_NOT_AFFECTED 0
#endif
#ifndef PR_SPEC_PRCTL
# define PR_SPEC_PRCTL (1UL << 0)
#endif
#ifndef PR_SPEC_ENABLE
# define PR_SPEC_ENABLE (1UL << 1)
#endif
#ifndef PR_SPEC_DISABLE
# define PR_SPEC_DISABLE (1UL << 2)
#endif
#ifndef PR_SPEC_FORCE_DISABLE
# define PR_SPEC_FORCE_DISABLE (1UL << 3)
#endif
#ifndef PR_SPEC_DISABLE_NOEXEC
# define PR_SPEC_DISABLE_NOEXEC (1UL << 4)
#endif
static void set_speculation() {
#if defined(__linux__) && defined(__x86_64__)
// PR_SPEC_DISABLE_NOEXEC doesn't survive execve, so we can't use it
// if ( prctl(PR_SET_SPECULATION_CTRL,
// PR_SPEC_STORE_BYPASS,
// PR_SPEC_DISABLE_NOEXEC, 0, 0) == 0 ) {
// return;
// }
prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
#else
#warning alt-java requested but SSB mitigation not available on this platform.
#endif
}
int main(int argc, char **argv) {
set_speculation();
char our_name[PATH_MAX], java_name[PATH_MAX];
ssize_t len = readlink("/proc/self/exe", our_name, PATH_MAX - 1);
if (len < 0) {
perror("I can't find myself");
exit(2);
}
our_name[len] = '\0'; // readlink(2) doesn't append a null byte
char *path = dirname(our_name);
strncpy(java_name, path, PATH_MAX - 1);
size_t remaining_bytes = PATH_MAX - strlen(path) - 1;
strncat(java_name, "/java", remaining_bytes);
execv(java_name, argv);
fprintf(stderr, "%s failed to launch: %s\n", java_name, strerror(errno));
exit(1);
}