{"id":2230784,"url":"http://patchwork.ozlabs.org/api/patches/2230784/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/20260430034724.1628-1-wegao@suse.com/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/projects/59/?format=json","name":"Linux Test Project development","link_name":"ltp","list_id":"ltp.lists.linux.it","list_email":"ltp@lists.linux.it","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260430034724.1628-1-wegao@suse.com>","list_archive_url":null,"date":"2026-04-30T03:47:16","name":"[v4] shmctl03: Fix 32-bit compat mode failure by adjusting comparisons for compat mode truncation","commit_ref":null,"pull_url":null,"state":"needs-review-ack","archived":false,"hash":"c23e7adf9d9572d6f7fe50200fe69243b7cd8a2d","submitter":{"id":85577,"url":"http://patchwork.ozlabs.org/api/people/85577/?format=json","name":"Wei Gao","email":"wegao@suse.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/20260430034724.1628-1-wegao@suse.com/mbox/","series":[{"id":502181,"url":"http://patchwork.ozlabs.org/api/series/502181/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=502181","date":"2026-04-30T03:47:16","name":"[v4] shmctl03: Fix 32-bit compat mode failure by adjusting comparisons for compat mode truncation","version":4,"mbox":"http://patchwork.ozlabs.org/series/502181/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230784/comments/","check":"warning","checks":"http://patchwork.ozlabs.org/api/patches/2230784/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=lists.linux.it header.i=@lists.linux.it\n header.a=rsa-sha256 header.s=picard header.b=W0ISlmHJ;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=suse.com header.i=@suse.com header.a=rsa-sha256\n header.s=google header.b=QfP8ydOT;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "},"content":"On 64-bit kernels, the default shmmax and shmall values often exceed\nthe range of a 32-bit unsigned long or are clipped differently by the\nkernel's compat syscall layer than they appear in /proc.\n\nLink: https://lore.kernel.org/ltp/aJm5SBOaRoe1e0PB@yuki.lan/\nSigned-off-by: Wei Gao \nSuggested-by: Cyril Hrubis \nReported-by: Dan Carpenter \n---\n include/tst_assert.h | 9 ++++---\n lib/tst_assert.c | 27 ++++++++++++++-----\n .../kernel/syscalls/ipc/shmctl/shmctl03.c | 17 +++++++++---\n 3 files changed, 41 insertions(+), 12 deletions(-)","diff":"diff --git a/include/tst_assert.h b/include/tst_assert.h\nindex dcb62dfea..2f1051270 100644\n--- a/include/tst_assert.h\n+++ b/include/tst_assert.h\n@@ -21,14 +21,17 @@ void tst_assert_int(const char *file, const int lineno,\n #define TST_ASSERT_FILE_INT(path, prefix, val) \\\n \ttst_assert_file_int(__FILE__, __LINE__, path, prefix, val)\n \n+#define TST_ASSERT_SATURATED_INT 0x01\n+#define TST_ASSERT_BITWISE 0x02\n+\n /*\n * Same as tst_assert_int() but for unsigned long.\n */\n void tst_assert_ulong(const char *file, const int lineno,\n- const char *path, unsigned long val);\n+ const char *path, unsigned long val, int flags);\n \n-#define TST_ASSERT_ULONG(path, val) \\\n-\ttst_assert_ulong(__FILE__, __LINE__, path, val)\n+#define TST_ASSERT_ULONG(path, val, ...) \\\n+\ttst_assert_ulong(__FILE__, __LINE__, path, val, (0, ##__VA_ARGS__))\n \n /*\n * Asserts that integer value stored in the prefix field of file pointed by path\ndiff --git a/lib/tst_assert.c b/lib/tst_assert.c\nindex b68bd5d39..fd651f53a 100644\n--- a/lib/tst_assert.c\n+++ b/lib/tst_assert.c\n@@ -5,6 +5,7 @@\n * Copyright (c) 2020 Cyril Hrubis \n */\n #include \n+#include \n #define TST_NO_DEFAULT_MAIN\n #include \"tst_assert.h\"\n #include \"tst_test.h\"\n@@ -23,18 +24,32 @@ void tst_assert_int(const char *file, const int lineno, const char *path, int va\n \ttst_res_(file, lineno, TFAIL, \"%s != %d got %d\", path, val, sys_val);\n }\n \n-void tst_assert_ulong(const char *file, const int lineno, const char *path, unsigned long val)\n+void tst_assert_ulong(const char *file, const int lineno, const char *path,\n+\t\t unsigned long val, int flags)\n {\n-\tunsigned long sys_val;\n-\n-\tsafe_file_scanf(file, lineno, NULL, path, \"%lu\", &sys_val);\n+\tunsigned long long sys_val_64;\n+\tunsigned long expected_val;\n+\n+\tsafe_file_scanf(file, lineno, NULL, path, \"%llu\", &sys_val_64);\n+\n+\tif (flags & TST_ASSERT_SATURATED_INT) {\n+\t\tif (sys_val_64 > (unsigned long long)INT_MAX)\n+\t\t\texpected_val = (unsigned long)INT_MAX;\n+\t\telse\n+\t\t\texpected_val = (unsigned long)sys_val_64;\n+\t} else if (flags & TST_ASSERT_BITWISE) {\n+\t\texpected_val = (unsigned long)(sys_val_64 & 0xFFFFFFFFULL);\n+\t} else {\n+\t\texpected_val = (unsigned long)sys_val_64;\n+\t}\n \n-\tif (val == sys_val) {\n+\tif (val == expected_val) {\n \t\ttst_res_(file, lineno, TPASS, \"%s = %lu\", path, val);\n \t\treturn;\n \t}\n \n-\ttst_res_(file, lineno, TFAIL, \"%s != %lu got %lu\", path, val, sys_val);\n+\ttst_res_(file, lineno, TFAIL, \"%s != %lu got %lu (raw: %llu)\",\n+\t\tpath, val, expected_val, sys_val_64);\n }\n \n void tst_assert_file_int(const char *file, const int lineno, const char *path, const char *prefix, int val)\ndiff --git a/testcases/kernel/syscalls/ipc/shmctl/shmctl03.c b/testcases/kernel/syscalls/ipc/shmctl/shmctl03.c\nindex a1f53e7c1..e6c7a8027 100644\n--- a/testcases/kernel/syscalls/ipc/shmctl/shmctl03.c\n+++ b/testcases/kernel/syscalls/ipc/shmctl/shmctl03.c\n@@ -30,9 +30,20 @@ static void verify_ipcinfo(void)\n \telse\n \t\ttst_res(TPASS, \"shmmin = 1\");\n \n-\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmax\", info.shmmax);\n-\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmni\", info.shmmni);\n-\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmall\", info.shmall);\n+\tif (tst_is_compat_mode()) {\n+\t\t/*\n+\t\t * On 64-bit kernel, shmmax is clamped to INT_MAX for 32-bit\n+\t\t * compat syscall, while shmmni and shmall are truncated\n+\t\t * to 32-bit.\n+\t\t */\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmax\", info.shmmax, TST_ASSERT_SATURATED_INT);\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmni\", info.shmmni, TST_ASSERT_BITWISE);\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmall\", info.shmall, TST_ASSERT_BITWISE);\n+\t} else {\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmax\", info.shmmax);\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmmni\", info.shmmni);\n+\t\tTST_ASSERT_ULONG(\"/proc/sys/kernel/shmall\", info.shmall);\n+\t}\n }\n \n static struct tst_test test = {\n","prefixes":["v4"]}