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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 15:08:40.1123 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a76c9443-07e5-4d0f-6251-08dab763f722 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VI1EUR03FT005.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB10155 X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FORGED_SPF_HELO,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2, SPF_HELO_PASS,SPF_NONE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747763869561710474?= X-GMAIL-MSGID: =?utf-8?q?1747763869561710474?= The aim of such policy is to prevent a user task from creating an executable mapping that is also writeable. An example of mmap() returning -EACCESS if the policy is enabled: mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC, flags, 0, 0); Similarly, mprotect() would return -EACCESS below: addr = mmap(0, size, PROT_READ | PROT_EXEC, flags, 0, 0); mprotect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC); The BPF filter that systemd MDWE uses is stateless, and disallows mprotect() with PROT_EXEC completely. This new prctl allows PROT_EXEC to be enabled if it was already PROT_EXEC, which allows the following case: addr = mmap(0, size, PROT_READ | PROT_EXEC, flags, 0, 0); mprotect(addr, size, PROT_READ | PROT_EXEC | PROT_BTI); where PROT_BTI enables branch tracking identification on arm64. Signed-off-by: Joey Gouly Co-developed-by: Catalin Marinas Signed-off-by: Catalin Marinas Cc: Andrew Morton --- include/linux/mman.h | 15 +++++++++++++++ include/linux/sched/coredump.h | 6 +++++- include/uapi/linux/prctl.h | 6 ++++++ kernel/sys.c | 18 ++++++++++++++++++ mm/mmap.c | 3 +++ mm/mprotect.c | 5 +++++ 6 files changed, 52 insertions(+), 1 deletion(-) diff --git a/include/linux/mman.h b/include/linux/mman.h index 58b3abd457a3..d84fdeab6b5e 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -156,4 +156,19 @@ calc_vm_flag_bits(unsigned long flags) } unsigned long vm_commit_limit(void); + +static inline bool map_deny_write_exec(struct vm_area_struct *vma, unsigned long vm_flags) +{ + if (!test_bit(MMF_HAS_MDWE, ¤t->mm->flags)) + return false; + + if ((vm_flags & VM_EXEC) && (vm_flags & VM_WRITE)) + return true; + + if (vma && !(vma->vm_flags & VM_EXEC) && (vm_flags & VM_EXEC)) + return true; + + return false; +} + #endif /* _LINUX_MMAN_H */ diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h index 8270ad7ae14c..0e17ae7fbfd3 100644 --- a/include/linux/sched/coredump.h +++ b/include/linux/sched/coredump.h @@ -81,9 +81,13 @@ static inline int get_dumpable(struct mm_struct *mm) * lifecycle of this mm, just for simplicity. */ #define MMF_HAS_PINNED 27 /* FOLL_PIN has run, never cleared */ + +#define MMF_HAS_MDWE 28 +#define MMF_HAS_MDWE_MASK (1 << MMF_HAS_MDWE) + #define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP) #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\ - MMF_DISABLE_THP_MASK) + MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK) #endif /* _LINUX_SCHED_COREDUMP_H */ diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index a5e06dcbba13..ab9db1e86230 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -281,6 +281,12 @@ struct prctl_mm_map { # define PR_SME_VL_LEN_MASK 0xffff # define PR_SME_VL_INHERIT (1 << 17) /* inherit across exec */ +/* Memory deny write / execute */ +#define PR_SET_MDWE 65 +# define PR_MDWE_FLAG_MMAP 1 + +#define PR_GET_MDWE 66 + #define PR_SET_VMA 0x53564d41 # define PR_SET_VMA_ANON_NAME 0 diff --git a/kernel/sys.c b/kernel/sys.c index 5fd54bf0e886..08e1dd6d2533 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2348,6 +2348,18 @@ static int prctl_set_vma(unsigned long opt, unsigned long start, } #endif /* CONFIG_ANON_VMA_NAME */ +static inline int prctl_set_mdwe(void) +{ + set_bit(MMF_HAS_MDWE, ¤t->mm->flags); + + return 0; +} + +static inline int prctl_get_mdwe(void) +{ + return test_bit(MMF_HAS_MDWE, ¤t->mm->flags); +} + SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) { @@ -2623,6 +2635,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, error = sched_core_share_pid(arg2, arg3, arg4, arg5); break; #endif + case PR_SET_MDWE: + error = prctl_set_mdwe(); + break; + case PR_GET_MDWE: + error = prctl_get_mdwe(); + break; case PR_SET_VMA: error = prctl_set_vma(arg2, arg3, arg4, arg5); break; diff --git a/mm/mmap.c b/mm/mmap.c index 099468aee4d8..42eaf6683216 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1409,6 +1409,9 @@ unsigned long do_mmap(struct file *file, unsigned long addr, vm_flags |= VM_NORESERVE; } + if (map_deny_write_exec(NULL, vm_flags)) + return -EACCES; + addr = mmap_region(file, addr, len, vm_flags, pgoff, uf); if (!IS_ERR_VALUE(addr) && ((vm_flags & VM_LOCKED) || diff --git a/mm/mprotect.c b/mm/mprotect.c index 8d770855b591..af71ef0788fd 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -766,6 +766,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len, break; 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Signed-off-by: Joey Gouly Cc: Shuah Khan Reviewed-by: Mark Brown Signed-off-by: Joey Gouly Signed-off-by: Kees Cook --- tools/testing/selftests/vm/mdwe_test.c | 194 +++++++++++++++++++++++++ 1 file changed, 194 insertions(+) create mode 100644 tools/testing/selftests/vm/mdwe_test.c diff --git a/tools/testing/selftests/vm/mdwe_test.c b/tools/testing/selftests/vm/mdwe_test.c new file mode 100644 index 000000000000..67f3fc06d069 --- /dev/null +++ b/tools/testing/selftests/vm/mdwe_test.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "../kselftest.h" + +#define PR_SET_MDWE 65 +# define PR_MDWE_FLAG_MMAP 1 + +#define PR_GET_MDWE 66 + +#ifdef __aarch64__ +#define PROT_BTI 0x10 /* BTI guarded page */ +#endif + +#define TEST1 "mmap(PROT_WRITE | PROT_EXEC)\n" +#define TEST2 "mmap(PROT_WRITE); mprotect(PROT_EXEC)\n" +#define TEST3 "mmap(PROT_EXEC); mprotect(PROT_EXEC | PROT_READ)\n" +#define TEST4 "mmap(PROT_EXEC); mprotect(PROT_EXEC | PROT_BTI)\n" + +int fork_test(int (*func)(int)) +{ + pid_t pid; + int status; + + pid = fork(); + if (pid < 0) { + printf("fork failed\n"); + return KSFT_FAIL; + } + + if (pid == 0) + exit(func(1)); + + waitpid(pid, &status, 0); + + if (WIFEXITED(status)) + return WEXITSTATUS(status); + + return 0; +} + +static inline void test_result(int err, const char *msg) +{ + switch (err) { + case KSFT_PASS: + ksft_test_result_pass(msg); + break; + case KSFT_FAIL: + ksft_test_result_fail(msg); + break; + case KSFT_SKIP: + ksft_test_result_skip(msg); + break; + default: + ksft_test_result_error("Unknown return code %d from %s", + err, msg); + break; + } +} + +int test1(int mdwe_enabled) +{ + void *p; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_WRITE | PROT_EXEC, mmap_flags, 0, 0); + + if (mdwe_enabled) + return p == MAP_FAILED ? KSFT_PASS : KSFT_FAIL; + else + return p != MAP_FAILED ? KSFT_PASS : KSFT_FAIL; +} + +int test2(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_WRITE, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return 0; + ret = mprotect(p, size, PROT_EXEC); + + if (mdwe_enabled) + return ret < 0 ? KSFT_PASS : KSFT_FAIL; + else + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} + +int test3(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_EXEC, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return 0; + + ret = mprotect(p, size, PROT_EXEC | PROT_READ); + + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} + +#ifdef __aarch64__ +int test4(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + if (!(getauxval(AT_HWCAP2) & HWCAP2_BTI)) + return KSFT_SKIP; + + p = mmap(0, size, PROT_EXEC, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return KSFT_FAIL; + + ret = mprotect(p, size, PROT_EXEC | PROT_BTI); + + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} +#endif + +int main(void) +{ + int ret; + + ksft_print_header(); +#ifdef __aarch64__ + ksft_set_plan(12); +#else + ksft_set_plan(9); +#endif + + // First run the tests without MDWE + test_result(test1(0), TEST1); + test_result(test2(0), TEST2); + test_result(test3(0), TEST3); +#ifdef __aarch64__ + test_result(test4(0), TEST4); +#endif + + // Enable MDWE and then run the tests again. + ret = prctl(PR_SET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); + if (ret < 0) { + ksft_print_msg("PR_SET_MDWE failed or unsupported!\n"); + goto exit; + } + + ret = prctl(PR_GET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); + if (ret == 0) + ksft_exit_fail_msg("PR_GET_MDWE failed!"); + + test_result(test1(1), "MDWE: " TEST1); + test_result(test2(1), "MDWE: " TEST2); + test_result(test3(1), "MDWE: " TEST3); +#ifdef __aarch64__ + test_result(test4(1), "MDWE: " TEST4); +#endif + + // Verify the MDWE setting is transferred when fork()ing + test_result(fork_test(test1), "MDWE+fork: " TEST1); + test_result(fork_test(test2), "MDWE+fork: " TEST2); + test_result(fork_test(test3), "MDWE+fork: " TEST3); +#ifdef __aarch64__ + test_result(fork_test(test4), "MDWE+fork: " TEST4); +#endif + +exit: + ksft_finished(); + + return 0; +} +