From patchwork Wed Aug 7 21:23:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Xu X-Patchwork-Id: 817522 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 600A215534B for ; Wed, 7 Aug 2024 21:23:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723065807; cv=none; b=Y9S+HNOyb0X/YSHpFGlAjtqydmQVTG3QT0kGJ0zckzQz5pMmoGwOijiXX0NLE/4nEQazgP1zbiqfGVQALZpciu2QEM5Up9PozrLBn7q3mYDBSPmdglV1iuKVCR1UW7ogzEWm0+JFK7b1wljR5qY4BM5IF+EP/1PrcqsR1/EcIRI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723065807; c=relaxed/simple; bh=RVL2ZRF4WUT/8v2zpcjyefjSqJV50mC/w2Dpk8L0aZc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=pvo/PFbTrMO7mWLKWHmeMCmrR/Zxj19AZa4grVMW3G3yfLedlT2MhLkO4UFh7KWf2hpeDwOSTD6m0c3Oh+yjTIVhamlFHCWRWjjYyB+vxjL489tJvSc6KhCy1/2yGa1bwBsuT7OkPTJy5c8Ak+HgWxzonKnqrHeug44KwdqJxG8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=hX5hehzd; arc=none smtp.client-ip=209.85.214.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="hX5hehzd" Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-1fc4fccdd78so3268175ad.2 for ; Wed, 07 Aug 2024 14:23:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1723065805; x=1723670605; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=RzngvWp9gQDLjMpg4qmJfCwDpEym+on+6/0H0Fu3rEY=; b=hX5hehzdWlV1ssWtyr6NUnbnnRhPYd3p6GbwVmF0TRreEjM4hTPYteapNvcjDdiC1o 0ft4uyiOxDsJveVI+XHdrQQKZ60KpJbd3SFpUK7Q4QbI06PVuzGSohCzhwIJsUj3W7C1 zaEGgspFoMdnLINH5abG65BQa7H7uSZ4LvdJQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723065805; x=1723670605; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=RzngvWp9gQDLjMpg4qmJfCwDpEym+on+6/0H0Fu3rEY=; b=U1UmT4f81isPlr1SC13+5KFfnO3wV5xEAj0TTn9nJqzYsayHzTkFkONKWVCg88upEk l1h0IuPyDqFSB3gSaDLNx8Ia0NsSIqqOmwrP6I+XKjswYHlm+jwluq18ti8cgo4Tf4H2 0X3/6J0yXBLjaLwam2pYv11sRTFa6fF88/abYFwnrmomp9XRKkzDifMIDQYo2QB0WjhU cFm7yBvfXThhsvssD0ImEzOg50oZIj226rfzdXAcu7+pBwfqRwaa2a1V+QLkG8oHTZrW 6L4V5PaMDTjM6VsNC6y+n7oLJr44ijSlswbGnWhG6L1Szo/0cZQAOIhejADoFuZ6HyLP o0/w== X-Forwarded-Encrypted: i=1; AJvYcCV+8I84cXi05G/C4enM7hlwPTl/psjDdsvcaI3O2kDmp4PRmBg8lXxBO8H50fhK9Bo+J9JtOBZ1d7Kx9CEXCDeVwpWR0KUT24BPIPiii571 X-Gm-Message-State: AOJu0YyhcOo803XGpfxF2remeJXo+2L6ydMixqIiCjdGB7c6Q+KVVyQm CQbOBPPoE40x8/hnqJFwRUbDr0WdT7KvF9H9xTPv6zXXZjI1x7JNmfL7otWZeQ== X-Google-Smtp-Source: AGHT+IGwzaAwKwkzWZfQJR7sQNT2BHUu0cPXPvgMKZvVP2Y4msVjXFqhIZz2Nbr0jImAy+2leat17g== X-Received: by 2002:a17:903:32c9:b0:1ff:52c:34ce with SMTP id d9443c01a7336-1ff574cac78mr219351345ad.53.1723065804353; Wed, 07 Aug 2024 14:23:24 -0700 (PDT) Received: from localhost (25.11.145.34.bc.googleusercontent.com. [34.145.11.25]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-1ff5905ff30sm110338885ad.156.2024.08.07.14.23.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Aug 2024 14:23:23 -0700 (PDT) From: jeffxu@chromium.org To: akpm@linux-foundation.org, willy@infradead.org, torvalds@linux-foundation.org, Liam.Howlett@oracle.com, pedro.falcato@gmail.com Cc: jeffxu@google.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, dave.hansen@intel.com, linux-hardening@vger.kernel.org, lorenzo.stoakes@oracle.com, mpe@ellerman.id.au, oliver.sang@intel.com, vbabka@suse.cz, Jeff Xu Subject: [PATCH v2] selftest mm/mseal: fix test_seal_mremap_move_dontunmap_anyaddr Date: Wed, 7 Aug 2024 21:23:20 +0000 Message-ID: <20240807212320.2831848-1-jeffxu@chromium.org> X-Mailer: git-send-email 2.46.0.76.ge559c4bf1a-goog Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jeff Xu the syscall remap accepts following: mremap(src, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, dst) when the src is sealed, the call will fail with error code: EPERM Previously, the test uses hard-coded 0xdeaddead as dst, and it will fail on the system with newer glibc installed. This patch removes test's dependency on glibc for mremap(), also fix the test and remove the hardcoded address. Signed-off-by: Jeff Xu Reported-by: Pedro Falcato --- tools/testing/selftests/mm/mseal_test.c | 57 ++++++++++++++++--------- 1 file changed, 36 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c index a818f010de47..5bce2fe102ab 100644 --- a/tools/testing/selftests/mm/mseal_test.c +++ b/tools/testing/selftests/mm/mseal_test.c @@ -110,6 +110,16 @@ static int sys_madvise(void *start, size_t len, int types) return sret; } +static void *sys_mremap(void *addr, size_t old_len, size_t new_len, + unsigned long flags, void *new_addr) +{ + void *sret; + + errno = 0; + sret = (void *) syscall(__NR_mremap, addr, old_len, new_len, flags, new_addr); + return sret; +} + static int sys_pkey_alloc(unsigned long flags, unsigned long init_val) { int ret = syscall(__NR_pkey_alloc, flags, init_val); @@ -1115,12 +1125,12 @@ static void test_seal_mremap_shrink(bool seal) } /* shrink from 4 pages to 2 pages. */ - ret2 = mremap(ptr, size, 2 * page_size, 0, 0); + ret2 = sys_mremap(ptr, size, 2 * page_size, 0, 0); if (seal) { - FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); + FAIL_TEST_IF_FALSE(ret2 == (void *) MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); } else { - FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED); + FAIL_TEST_IF_FALSE(ret2 != (void *) MAP_FAILED); } @@ -1147,7 +1157,7 @@ static void test_seal_mremap_expand(bool seal) } /* expand from 2 page to 4 pages. */ - ret2 = mremap(ptr, 2 * page_size, 4 * page_size, 0, 0); + ret2 = sys_mremap(ptr, 2 * page_size, 4 * page_size, 0, 0); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); @@ -1180,7 +1190,7 @@ static void test_seal_mremap_move(bool seal) } /* move from ptr to fixed address. */ - ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr); + ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newPtr); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); @@ -1299,7 +1309,7 @@ static void test_seal_mremap_shrink_fixed(bool seal) } /* mremap to move and shrink to fixed address */ - ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, + ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); @@ -1330,7 +1340,7 @@ static void test_seal_mremap_expand_fixed(bool seal) } /* mremap to move and expand to fixed address */ - ret2 = mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED, + ret2 = sys_mremap(ptr, page_size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); @@ -1361,7 +1371,7 @@ static void test_seal_mremap_move_fixed(bool seal) } /* mremap to move to fixed address */ - ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr); + ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, newAddr); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); @@ -1390,14 +1400,13 @@ static void test_seal_mremap_move_fixed_zero(bool seal) /* * MREMAP_FIXED can move the mapping to zero address */ - ret2 = mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, + ret2 = sys_mremap(ptr, size, 2 * page_size, MREMAP_MAYMOVE | MREMAP_FIXED, 0); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); } else { FAIL_TEST_IF_FALSE(ret2 == 0); - } REPORT_TEST_PASS(); @@ -1420,13 +1429,13 @@ static void test_seal_mremap_move_dontunmap(bool seal) } /* mremap to move, and don't unmap src addr. */ - ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0); + ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, 0); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); } else { + /* kernel will allocate a new address */ FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED); - } REPORT_TEST_PASS(); @@ -1434,7 +1443,7 @@ static void test_seal_mremap_move_dontunmap(bool seal) static void test_seal_mremap_move_dontunmap_anyaddr(bool seal) { - void *ptr; + void *ptr, *ptr2; unsigned long page_size = getpagesize(); unsigned long size = 4 * page_size; int ret; @@ -1449,24 +1458,30 @@ static void test_seal_mremap_move_dontunmap_anyaddr(bool seal) } /* - * The 0xdeaddead should not have effect on dest addr - * when MREMAP_DONTUNMAP is set. + * The new address is any address that not allocated. + * use allocate/free to similate that. */ - ret2 = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, - 0xdeaddead); + setup_single_address(size, &ptr2); + FAIL_TEST_IF_FALSE(ptr2 != (void *)-1); + ret = sys_munmap(ptr2, size); + FAIL_TEST_IF_FALSE(!ret); + + /* + * remap to any address. + */ + ret2 = sys_mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, + (void *) ptr2); if (seal) { FAIL_TEST_IF_FALSE(ret2 == MAP_FAILED); FAIL_TEST_IF_FALSE(errno == EPERM); } else { - FAIL_TEST_IF_FALSE(ret2 != MAP_FAILED); - FAIL_TEST_IF_FALSE((long)ret2 != 0xdeaddead); - + /* remap success and return ptr2 */ + FAIL_TEST_IF_FALSE(ret2 == ptr2); } REPORT_TEST_PASS(); } - static void test_seal_merge_and_split(void) { void *ptr;