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On aarch64, use PROT_MTE on arena mapping if MTE is enabled. #31

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On aarch64, use PROT_MTE on arena mapping if MTE is enabled. #31

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10 changes: 9 additions & 1 deletion arena.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
#include <string.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/shm.h>
#include <sys/syscall.h>
#include <unistd.h>
Expand Down Expand Up @@ -232,15 +233,22 @@ static void check_thp_state(void) {
void *alloc_arena_mmap(size_t page_size, bool use_thp, size_t arena_size, int fd) {
void *arena;
size_t pagemask = page_size - 1;
int prot = PROT_READ | PROT_WRITE;
int flags;

#ifdef __aarch64__
int tac = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
if (tac != -1 && (tac & PR_MTE_TCF_MASK))
prot |= PROT_MTE;
#endif

if (fd == -1)
flags = MAP_PRIVATE | MAP_ANONYMOUS | get_page_size_flags(page_size);
else
flags = MAP_SHARED;

arena_size = (arena_size + pagemask) & ~pagemask;
arena = mmap(0, arena_size, PROT_READ | PROT_WRITE, flags, fd, 0);
arena = mmap(0, arena_size, prot, flags, fd, 0);
if (arena == MAP_FAILED) {
perror("mmap");
exit(1);
Expand Down