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libdislocator freebsd 13 update to amke it works

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with vm.imply_prot_max set.
This commit is contained in:
David Carlier 2021-03-19 21:19:22 +00:00
parent 2102264acf
commit 14e1b0ffba
1 changed files with 9 additions and 3 deletions
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12
utils/libdislocator/libdislocator.so.c
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@ -168,7 +168,7 @@ static void *__dislocator_alloc(size_t len) {
u8 * ret, *base;
size_t tlen;
int flags, fd, sp;
int flags, protflags, fd, sp;
if (total_mem + len > max_mem || total_mem + len < total_mem) {
@ -191,8 +191,14 @@ static void *__dislocator_alloc(size_t len) {
base = NULL;
tlen = (1 + PG_COUNT(rlen + 8)) * PAGE_SIZE;
protflags = PROT_READ | PROT_WRITE;
flags = MAP_PRIVATE | MAP_ANONYMOUS;
fd = -1;
#if defined(PROT_MAX)
// apply when sysctl vm.imply_prot_max is set to 1
// no-op otherwise
protflags |= PROT_MAX(PROT_READ | PROT_WRITE);
#endif
#if defined(USEHUGEPAGE)
sp = (rlen >= SUPER_PAGE_SIZE && !(rlen % SUPER_PAGE_SIZE));
@ -215,7 +221,7 @@ static void *__dislocator_alloc(size_t len) {
(void)sp;
#endif
ret = (u8 *)mmap(base, tlen, PROT_READ | PROT_WRITE, flags, fd, 0);
ret = (u8 *)mmap(base, tlen, protflags, flags, fd, 0);
#if defined(USEHUGEPAGE)
/* We try one more time with regular call */
if (ret == MAP_FAILED) {
@ -229,7 +235,7 @@ static void *__dislocator_alloc(size_t len) {
#elif defined(__sun)
flags &= -MAP_ALIGN;
#endif
ret = (u8 *)mmap(NULL, tlen, PROT_READ | PROT_WRITE, flags, fd, 0);
ret = (u8 *)mmap(NULL, tlen, protflags, flags, fd, 0);
}