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diff --git a/sys/arm64/include/elf.h b/sys/arm64/include/elf.h
--- a/sys/arm64/include/elf.h
+++ b/sys/arm64/include/elf.h
@@ -74,6 +74,8 @@
#define ELF_MACHINE_OK(x) ((x) == (ELF_ARCH))
+#define ELF_IS_CHERI(hdr) (((hdr)->e_flags & EF_AARCH64_CHERI_PURECAP) != 0)
+
/* Define "machine" characteristics */
#if __ELF_WORD_SIZE == 64
#define ELF_TARG_CLASS ELFCLASS64
diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c
--- a/sys/kern/imgact_elf.c
+++ b/sys/kern/imgact_elf.c
@@ -36,6 +36,7 @@
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/compressor.h>
+#include <sys/elf.h>
#include <sys/exec.h>
#include <sys/fcntl.h>
#include <sys/imgact.h>
@@ -500,6 +501,7 @@
hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
hdr->e_ident[EI_VERSION] != EV_CURRENT ||
hdr->e_phentsize != sizeof(Elf_Phdr) ||
+ ELF_IS_CHERI(hdr) ||
hdr->e_version != ELF_TARG_VER)
return (ENOEXEC);
diff --git a/sys/kern/link_elf.c b/sys/kern/link_elf.c
--- a/sys/kern/link_elf.c
+++ b/sys/kern/link_elf.c
@@ -1077,6 +1077,11 @@
error = ENOEXEC;
goto out;
}
+ if (ELF_IS_CHERI(hdr)) {
+ link_elf_error(filename, "CHERI pure capability ABI");
+ error = ENOEXEC;
+ goto out;
+ }
/*
* We rely on the program header being in the first page.
diff --git a/sys/kern/link_elf_obj.c b/sys/kern/link_elf_obj.c
--- a/sys/kern/link_elf_obj.c
+++ b/sys/kern/link_elf_obj.c
@@ -387,6 +387,7 @@
hdr->e_ident[EI_VERSION] != EV_CURRENT ||
hdr->e_version != EV_CURRENT ||
hdr->e_type != ET_REL ||
+ ELF_IS_CHERI(hdr) ||
hdr->e_machine != ELF_TARG_MACH) {
error = EFTYPE;
goto out;
@@ -798,6 +799,11 @@
error = ENOEXEC;
goto out;
}
+ if (ELF_IS_CHERI(hdr)) {
+ link_elf_error(filename, "Pure capability ABI");
+ error = ENOEXEC;
+ goto out;
+ }
lf = linker_make_file(filename, &link_elf_class);
if (!lf) {
diff --git a/sys/sys/elf.h b/sys/sys/elf.h
--- a/sys/sys/elf.h
+++ b/sys/sys/elf.h
@@ -38,4 +38,11 @@
#include <sys/elf32.h>
#include <sys/elf64.h>
+#ifndef ELF_IS_CHERI
+#if __has_feature(capabilities)
+#error "Must have ELF_IS_CHERI for CHERI architectures"
+#endif
+#define ELF_IS_CHERI(hdr) false
+#endif
+
#endif /* !_SYS_ELF_H_ */
diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h
--- a/sys/sys/elf_common.h
+++ b/sys/sys/elf_common.h
@@ -317,6 +317,8 @@
/**
* e_flags
*/
+#define EF_AARCH64_CHERI_PURECAP 0x00010000
+
#define EF_ARM_RELEXEC 0x1
#define EF_ARM_HASENTRY 0x2
#define EF_ARM_SYMSARESORTED 0x4

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