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7615b94b63
Add a self test which exercises both the kexec-jump facility, and the kexec exception handling. Invoke a trivial payload which just does an int3 and returns, flip-flopping its entry point for the next invocation between two implementations of the same thing. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250326142404.256980-5-dwmw2@infradead.org
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/kexec.h>
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#include <linux/reboot.h>
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#include <sys/reboot.h>
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#include <sys/syscall.h>
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asm(
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" .code64\n"
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" .data\n"
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"purgatory_start:\n"
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// Trigger kexec debug exception handling
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" int3\n"
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// Set load address for next time
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" leaq purgatory_start_b(%rip), %r11\n"
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" movq %r11, 8(%rsp)\n"
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// Back to Linux
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" ret\n"
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// Same again
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"purgatory_start_b:\n"
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// Trigger kexec debug exception handling
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" int3\n"
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// Set load address for next time
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" leaq purgatory_start(%rip), %r11\n"
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" movq %r11, 8(%rsp)\n"
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// Back to Linux
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" ret\n"
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"purgatory_end:\n"
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".previous"
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);
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extern char purgatory_start[], purgatory_end[];
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int main (void)
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{
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struct kexec_segment segment = {};
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int ret;
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segment.buf = purgatory_start;
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segment.bufsz = purgatory_end - purgatory_start;
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segment.mem = (void *)0x400000;
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segment.memsz = 0x1000;
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ret = syscall(__NR_kexec_load, 0x400000, 1, &segment, KEXEC_PRESERVE_CONTEXT);
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if (ret) {
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perror("kexec_load");
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exit(1);
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}
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ret = syscall(__NR_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_KEXEC);
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if (ret) {
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perror("kexec reboot");
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exit(1);
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}
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ret = syscall(__NR_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_KEXEC);
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if (ret) {
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perror("kexec reboot");
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exit(1);
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}
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printf("Success\n");
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return 0;
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}
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