From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1944) id 668033851503; Thu, 27 Oct 2022 13:59:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 668033851503 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1666879165; bh=H7zsr7jq37jDpJiL3PunG30STPcRadtD+UUy4xxnsgk=; h=From:To:Subject:Date:From; b=uHUww54GxuPRW21/3iRSY1a+suVm5AFKZT71J8A7zaY1fGr+KJe8hNSDn2Oh0fevu rUi707lR5sPLPqpQr+6kQeo+M7l+Mya5uy/tDPeJwWbJN7XpW9WcsWsNm9ML5JHijv lNrtW92oiHyQxR7Itkc0LMp3zaBSE1Yv8KQgA1ak= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Szabolcs Nagy To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] TODO(uapi): cheri: start: restrict auxv capability permissions X-Act-Checkin: glibc X-Git-Author: Szabolcs Nagy X-Git-Refname: refs/heads/arm/morello/main X-Git-Oldrev: 3dcebd639847f641679ae301554d6ad74578ff4e X-Git-Newrev: 5a4c66e5b37e3ce78d8cfc3b9229d9d73a6bab39 Message-Id: <20221027135925.668033851503@sourceware.org> Date: Thu, 27 Oct 2022 13:59:18 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5a4c66e5b37e3ce78d8cfc3b9229d9d73a6bab39 commit 5a4c66e5b37e3ce78d8cfc3b9229d9d73a6bab39 Author: Szabolcs Nagy Date: Fri Oct 21 09:52:47 2022 +0100 TODO(uapi): cheri: start: restrict auxv capability permissions TODO: not needed with full pcuabi Diff: --- elf/dl-support.c | 2 ++ elf/rtld.c | 2 ++ sysdeps/aarch64/morello/dl-machine.h | 2 ++ sysdeps/aarch64/morello/start.c | 2 ++ 4 files changed, 8 insertions(+) diff --git a/elf/dl-support.c b/elf/dl-support.c index ffc1d8d01b..f2f0bdbaf4 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -258,7 +258,9 @@ _dl_aux_init (ElfW(auxv_t) *av) # ifdef __CHERI_PURE_CAPABILITY__ _dl_main_map.l_map_start = auxv_values[AT_CHERI_EXEC_RX_CAP]; + _dl_main_map.l_map_start = __builtin_cheri_perms_and (_dl_main_map.l_map_start, CAP_PERM_MASK_RX); _dl_main_map.l_rw_start = auxv_values[AT_CHERI_EXEC_RW_CAP]; + _dl_main_map.l_rw_start = __builtin_cheri_perms_and (_dl_main_map.l_rw_start, CAP_PERM_MASK_RW); # endif } #endif diff --git a/elf/rtld.c b/elf/rtld.c index 41ffb297e5..7eeb5c174b 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1724,9 +1724,11 @@ dl_main (const ElfW(Phdr) *phdr, { case AT_CHERI_EXEC_RX_CAP: main_map->l_map_start = av->a_un.a_val; + main_map->l_map_start = __builtin_cheri_perms_and (main_map->l_map_start, CAP_PERM_MASK_RX); break; case AT_CHERI_EXEC_RW_CAP: main_map->l_rw_start = av->a_un.a_val; + main_map->l_rw_start = __builtin_cheri_perms_and (main_map->l_rw_start, CAP_PERM_MASK_RW); break; } #endif diff --git a/sysdeps/aarch64/morello/dl-machine.h b/sysdeps/aarch64/morello/dl-machine.h index 0f681b1925..7da7c5bfc0 100644 --- a/sysdeps/aarch64/morello/dl-machine.h +++ b/sysdeps/aarch64/morello/dl-machine.h @@ -152,6 +152,8 @@ elf_machine_rtld_base_setup (struct link_map *map, void *args) cap_rw = cap_exe_rw; ldso_base = cap_rx; /* Assume load segments start at vaddr 0. */ } + cap_rx = __builtin_cheri_perms_and (cap_rx, CAP_PERM_MASK_RX); + cap_rw = __builtin_cheri_perms_and (cap_rw, CAP_PERM_MASK_RW); map->l_addr = ldso_base; map->l_map_start = cap_rx; map->l_rw_start = cap_rw; diff --git a/sysdeps/aarch64/morello/start.c b/sysdeps/aarch64/morello/start.c index de7aeab4c9..5d413ae78e 100644 --- a/sysdeps/aarch64/morello/start.c +++ b/sysdeps/aarch64/morello/start.c @@ -124,9 +124,11 @@ get_caps (uintptr_t *cap_rx, uintptr_t *cap_rw, const uintptr_t *auxv) return; case AT_CHERI_EXEC_RX_CAP: *cap_rx = auxv[1]; + *cap_rx = __builtin_cheri_perms_and (*cap_rx, CAP_PERM_MASK_RX); break; case AT_CHERI_EXEC_RW_CAP: *cap_rw = auxv[1]; + *cap_rw = __builtin_cheri_perms_and (*cap_rw, CAP_PERM_MASK_RW); break; } auxv += 2;