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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-24 15:29:58 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-26 15:32:01 +0100 |
| commit | dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28 (patch) | |
| tree | 5d23180de7ac5a9098f0d51e9a0b672b2f5faf34 | |
| parent | 28f19db3b85abd039734b55b29acc22897b88302 (diff) | |
| download | glibc-dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28.zip glibc-dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28.tar.gz glibc-dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28.tar.bz2 | |
TODO(uapi): mmap perm emulation
| -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 60da029..a7bd396 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; |