diff options
| -rw-r--r-- | sysdeps/unix/sysv/linux/mmap64.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/mmap64.c b/sysdeps/unix/sysv/linux/mmap64.c index 60da02939d..a7bd396880 100644 --- a/sysdeps/unix/sysv/linux/mmap64.c +++ b/sysdeps/unix/sysv/linux/mmap64.c @@ -22,6 +22,9 @@ #include <sysdep.h> #include <ldsodefs.h> #include <mmap_internal.h> +#ifdef __CHERI_PURE_CAPABILITY__ +# include <cheri_perms.h> +#endif #ifdef __NR_mmap2 /* To avoid silent truncation of offset when using mmap2, do not accept @@ -64,6 +67,20 @@ __mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset) { size_t ps = GLRO(dl_pagesize); ret = __builtin_cheri_bounds_set (ret, (len + ps - 1) & -ps); + unsigned long mask = CAP_PERM_MASK_BASE; + if (prot & PROT_READ) + mask |= CAP_PERM_MASK_R; + if (prot & PROT_WRITE) + mask |= CAP_PERM_MASK_RW; + if (prot & PROT_EXEC) + mask |= CAP_PERM_MASK_RX; + if (prot & PROT_MAX (PROT_READ)) + mask |= CAP_PERM_MASK_R; + if (prot & PROT_MAX (PROT_WRITE)) + mask |= CAP_PERM_MASK_RW; + if (prot & PROT_MAX (PROT_EXEC)) + mask |= CAP_PERM_MASK_RX; + ret = __builtin_cheri_perms_and (ret, mask); } #endif return ret; |