From a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255 Mon Sep 17 00:00:00 2001 From: Jinke Han Date: Tue, 8 Sep 2026 15:37:42 +0800 Subject: x86/kprobes: Fix crash when probing CS CALL instructions When using eBPF to probe CS CALL instructions within a function, a crash can be triggered. The eBPF tool probes offset 257 of the __hrtimer_run_queues() function: <__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1) <__hrtimer_run_queues+254>: mov %r14,%rdi <__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12> <__hrtimer_run_queues+263>: mov %eax,%r12d <__hrtimer_run_queues+266>: xchg %ax,%ax <__hrtimer_run_queues+268>: mov %r13,%rdi Which triggers this crash: BUG: unable to handle page fault for address: 00000000000f41c9 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P RIP: 0010:__hrtimer_run_queues+0x106/0x230 Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is at the 6th byte of the above CS CALL instruction. Since the CS CALL instruction occupies 6 bytes, the exception occurred in the middle of that call instruction. The root cause is that when using eBPF tools to probe in the middle of a function, a kprobe with INT3 is used as the underlying implementation. During single-step emulation of the original CALL instruction, int3_emulate_call() assumes that the probed CALL instruction is 5 bytes long. However, the actual CS-prefixed CALL instruction occupies 6 bytes, so it constructs an incorrect exception return address. When the CPU returns from the kprobe handler, the next instruction to be executed is at the address of the last byte of that CS CALL instruction. Coincidentally, starting from that address, the CPU fetches and decodes a completely different instruction, which ultimately triggers a kernel crash. Fix the issue by using the actual instruction length obtained from the instruction decoder when constructing the exception return address, rather than relying on the hardcoded CALL_INSN_SIZE macro. [ mingo: Refined the changelog ] Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step") Suggested-by: Masami Hiramatsu (Google) Signed-off-by: Jinke Han Signed-off-by: Ingo Molnar Reviewed-by: Masami Hiramatsu (Google) Acked-by: Yafang Shao Acked-by: Borislav Petkov Cc: Peter Zijlstra Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000 --- lib/test-kstrtox.c | 924 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 924 insertions(+) create mode 100644 lib/test-kstrtox.c (limited to 'lib/test-kstrtox.c') diff --git a/lib/test-kstrtox.c b/lib/test-kstrtox.c new file mode 100644 index 000000000..925523475 --- /dev/null +++ b/lib/test-kstrtox.c @@ -0,0 +1,924 @@ +#include +#include +#include + +#define for_each_test(i, test) \ + for (i = 0; i < ARRAY_SIZE(test); i++) + +struct test_fail { + const char *str; + unsigned int base; +}; + +#define DEFINE_TEST_FAIL(test) \ + const struct test_fail test[] __initconst + +#define DECLARE_TEST_OK(type, test_type) \ + test_type { \ + const char *str; \ + unsigned int base; \ + type expected_res; \ + } + +#define DEFINE_TEST_OK(type, test) \ + const type test[] __initconst + +#define TEST_FAIL(fn, type, fmt, test) \ +{ \ + unsigned int i; \ + \ + for_each_test(i, test) { \ + const struct test_fail *t = &test[i]; \ + type tmp; \ + int rv; \ + \ + tmp = 0; \ + rv = fn(t->str, t->base, &tmp); \ + if (rv >= 0) { \ + WARN(1, "str '%s', base %u, expected -E, got %d/" fmt "\n", \ + t->str, t->base, rv, tmp); \ + continue; \ + } \ + } \ +} + +#define TEST_OK(fn, type, fmt, test) \ +{ \ + unsigned int i; \ + \ + for_each_test(i, test) { \ + const typeof(test[0]) *t = &test[i]; \ + type res; \ + int rv; \ + \ + rv = fn(t->str, t->base, &res); \ + if (rv != 0) { \ + WARN(1, "str '%s', base %u, expected 0/" fmt ", got %d\n", \ + t->str, t->base, t->expected_res, rv); \ + continue; \ + } \ + if (res != t->expected_res) { \ + WARN(1, "str '%s', base %u, expected " fmt ", got " fmt "\n", \ + t->str, t->base, t->expected_res, res); \ + continue; \ + } \ + } \ +} + +static void __init test_kstrtoull_ok(void) +{ + DECLARE_TEST_OK(unsigned long long, struct test_ull); + static DEFINE_TEST_OK(struct test_ull, test_ull_ok) = { + {"0", 10, 0ULL}, + {"1", 10, 1ULL}, + {"127", 10, 127ULL}, + {"128", 10, 128ULL}, + {"129", 10, 129ULL}, + {"255", 10, 255ULL}, + {"256", 10, 256ULL}, + {"257", 10, 257ULL}, + {"32767", 10, 32767ULL}, + {"32768", 10, 32768ULL}, + {"32769", 10, 32769ULL}, + {"65535", 10, 65535ULL}, + {"65536", 10, 65536ULL}, + {"65537", 10, 65537ULL}, + {"2147483647", 10, 2147483647ULL}, + {"2147483648", 10, 2147483648ULL}, + {"2147483649", 10, 2147483649ULL}, + {"4294967295", 10, 4294967295ULL}, + {"4294967296", 10, 4294967296ULL}, + {"4294967297", 10, 4294967297ULL}, + {"9223372036854775807", 10, 9223372036854775807ULL}, + {"9223372036854775808", 10, 9223372036854775808ULL}, + {"9223372036854775809", 10, 9223372036854775809ULL}, + {"18446744073709551614", 10, 18446744073709551614ULL}, + {"18446744073709551615", 10, 18446744073709551615ULL}, + + {"00", 8, 00ULL}, + {"01", 8, 01ULL}, + {"0177", 8, 0177ULL}, + {"0200", 8, 0200ULL}, + {"0201", 8, 0201ULL}, + {"0377", 8, 0377ULL}, + {"0400", 8, 0400ULL}, + {"0401", 8, 0401ULL}, + {"077777", 8, 077777ULL}, + {"0100000", 8, 0100000ULL}, + {"0100001", 8, 0100001ULL}, + {"0177777", 8, 0177777ULL}, + {"0200000", 8, 0200000ULL}, + {"0200001", 8, 0200001ULL}, + {"017777777777", 8, 017777777777ULL}, + {"020000000000", 8, 020000000000ULL}, + {"020000000001", 8, 020000000001ULL}, + {"037777777777", 8, 037777777777ULL}, + {"040000000000", 8, 040000000000ULL}, + {"040000000001", 8, 040000000001ULL}, + {"0777777777777777777777", 8, 0777777777777777777777ULL}, + {"01000000000000000000000", 8, 01000000000000000000000ULL}, + {"01000000000000000000001", 8, 01000000000000000000001ULL}, + {"01777777777777777777776", 8, 01777777777777777777776ULL}, + {"01777777777777777777777", 8, 01777777777777777777777ULL}, + + {"0x0", 16, 0x0ULL}, + {"0x1", 16, 0x1ULL}, + {"0x7f", 16, 0x7fULL}, + {"0x80", 16, 0x80ULL}, + {"0x81", 16, 0x81ULL}, + {"0xff", 16, 0xffULL}, + {"0x100", 16, 0x100ULL}, + {"0x101", 16, 0x101ULL}, + {"0x7fff", 16, 0x7fffULL}, + {"0x8000", 16, 0x8000ULL}, + {"0x8001", 16, 0x8001ULL}, + {"0xffff", 16, 0xffffULL}, + {"0x10000", 16, 0x10000ULL}, + {"0x10001", 16, 0x10001ULL}, + {"0x7fffffff", 16, 0x7fffffffULL}, + {"0x80000000", 16, 0x80000000ULL}, + {"0x80000001", 16, 0x80000001ULL}, + {"0xffffffff", 16, 0xffffffffULL}, + {"0x100000000", 16, 0x100000000ULL}, + {"0x100000001", 16, 0x100000001ULL}, + {"0x7fffffffffffffff", 16, 0x7fffffffffffffffULL}, + {"0x8000000000000000", 16, 0x8000000000000000ULL}, + {"0x8000000000000001", 16, 0x8000000000000001ULL}, + {"0xfffffffffffffffe", 16, 0xfffffffffffffffeULL}, + {"0xffffffffffffffff", 16, 0xffffffffffffffffULL}, + + {"0\n", 0, 0ULL}, + }; + TEST_OK(kstrtoull, unsigned long long, "%llu", test_ull_ok); +} + +static void __init test_kstrtoull_fail(void) +{ + static DEFINE_TEST_FAIL(test_ull_fail) = { + {"", 0}, + {"", 8}, + {"", 10}, + {"", 16}, + {"\n", 0}, + {"\n", 8}, + {"\n", 10}, + {"\n", 16}, + {"\n0", 0}, + {"\n0", 8}, + {"\n0", 10}, + {"\n0", 16}, + {"+", 0}, + {"+", 8}, + {"+", 10}, + {"+", 16}, + {"-", 0}, + {"-", 8}, + {"-", 10}, + {"-", 16}, + {"0x", 0}, + {"0x", 16}, + {"0X", 0}, + {"0X", 16}, + {"0 ", 0}, + {"1+", 0}, + {"1-", 0}, + {" 2", 0}, + /* base autodetection */ + {"0x0z", 0}, + {"0z", 0}, + {"a", 0}, + /* digit >= base */ + {"2", 2}, + {"8", 8}, + {"a", 10}, + {"A", 10}, + {"g", 16}, + {"G", 16}, + /* overflow */ + {"10000000000000000000000000000000000000000000000000000000000000000", 2}, + {"2000000000000000000000", 8}, + {"18446744073709551616", 10}, + {"569202370375329612767", 10}, + {"10000000000000000", 16}, + /* negative */ + {"-0", 0}, + {"-0", 8}, + {"-0", 10}, + {"-0", 16}, + {"-1", 0}, + {"-1", 8}, + {"-1", 10}, + {"-1", 16}, + /* sign is first character if any */ + {"-+1", 0}, + {"-+1", 8}, + {"-+1", 10}, + {"-+1", 16}, + /* nothing after \n */ + {"0\n0", 0}, + {"0\n0", 8}, + {"0\n0", 10}, + {"0\n0", 16}, + {"0\n+", 0}, + {"0\n+", 8}, + {"0\n+", 10}, + {"0\n+", 16}, + {"0\n-", 0}, + {"0\n-", 8}, + {"0\n-", 10}, + {"0\n-", 16}, + {"0\n ", 0}, + {"0\n ", 8}, + {"0\n ", 10}, + {"0\n ", 16}, + }; + TEST_FAIL(kstrtoull, unsigned long long, "%llu", test_ull_fail); +} + +static void __init test_kstrtoll_ok(void) +{ + DECLARE_TEST_OK(long long, struct test_ll); + static DEFINE_TEST_OK(struct test_ll, test_ll_ok) = { + {"0", 10, 0LL}, + {"1", 10, 1LL}, + {"127", 10, 127LL}, + {"128", 10, 128LL}, + {"129", 10, 129LL}, + {"255", 10, 255LL}, + {"256", 10, 256LL}, + {"257", 10, 257LL}, + {"32767", 10, 32767LL}, + {"32768", 10, 32768LL}, + {"32769", 10, 32769LL}, + {"65535", 10, 65535LL}, + {"65536", 10, 65536LL}, + {"65537", 10, 65537LL}, + {"2147483647", 10, 2147483647LL}, + {"2147483648", 10, 2147483648LL}, + {"2147483649", 10, 2147483649LL}, + {"4294967295", 10, 4294967295LL}, + {"4294967296", 10, 4294967296LL}, + {"4294967297", 10, 4294967297LL}, + {"9223372036854775807", 10, 9223372036854775807LL}, + + {"-0", 10, 0LL}, + {"-1", 10, -1LL}, + {"-2", 10, -2LL}, + {"-9223372036854775808", 10, LLONG_MIN}, + }; + TEST_OK(kstrtoll, long long, "%lld", test_ll_ok); +} + +static void __init test_kstrtoll_fail(void) +{ + static DEFINE_TEST_FAIL(test_ll_fail) = { + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"569202370375329612767", 10}, + {"-9223372036854775809", 10}, + {"-18446744073709551614", 10}, + {"-18446744073709551615", 10}, + {"-569202370375329612767", 10}, + /* sign is first character if any */ + {"-+1", 0}, + {"-+1", 8}, + {"-+1", 10}, + {"-+1", 16}, + }; + TEST_FAIL(kstrtoll, long long, "%lld", test_ll_fail); +} + +static void __init test_kstrtou64_ok(void) +{ + DECLARE_TEST_OK(u64, struct test_u64); + static DEFINE_TEST_OK(struct test_u64, test_u64_ok) = { + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + {"32768", 10, 32768}, + {"32769", 10, 32769}, + {"65534", 10, 65534}, + {"65535", 10, 65535}, + {"65536", 10, 65536}, + {"65537", 10, 65537}, + {"2147483646", 10, 2147483646}, + {"2147483647", 10, 2147483647}, + {"2147483648", 10, 2147483648ULL}, + {"2147483649", 10, 2147483649ULL}, + {"4294967294", 10, 4294967294ULL}, + {"4294967295", 10, 4294967295ULL}, + {"4294967296", 10, 4294967296ULL}, + {"4294967297", 10, 4294967297ULL}, + {"9223372036854775806", 10, 9223372036854775806ULL}, + {"9223372036854775807", 10, 9223372036854775807ULL}, + {"9223372036854775808", 10, 9223372036854775808ULL}, + {"9223372036854775809", 10, 9223372036854775809ULL}, + {"18446744073709551614", 10, 18446744073709551614ULL}, + {"18446744073709551615", 10, 18446744073709551615ULL}, + }; + TEST_OK(kstrtou64, u64, "%llu", test_u64_ok); +} + +static void __init test_kstrtou64_fail(void) +{ + static DEFINE_TEST_FAIL(test_u64_fail) = { + {"-2", 10}, + {"-1", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + {"569202370375329612767", 10}, + }; + TEST_FAIL(kstrtou64, u64, "%llu", test_u64_fail); +} + +static void __init test_kstrtos64_ok(void) +{ + DECLARE_TEST_OK(s64, struct test_s64); + static DEFINE_TEST_OK(struct test_s64, test_s64_ok) = { + {"-128", 10, -128}, + {"-127", 10, -127}, + {"-1", 10, -1}, + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + {"32768", 10, 32768}, + {"32769", 10, 32769}, + {"65534", 10, 65534}, + {"65535", 10, 65535}, + {"65536", 10, 65536}, + {"65537", 10, 65537}, + {"2147483646", 10, 2147483646}, + {"2147483647", 10, 2147483647}, + {"2147483648", 10, 2147483648LL}, + {"2147483649", 10, 2147483649LL}, + {"4294967294", 10, 4294967294LL}, + {"4294967295", 10, 4294967295LL}, + {"4294967296", 10, 4294967296LL}, + {"4294967297", 10, 4294967297LL}, + {"9223372036854775806", 10, 9223372036854775806LL}, + {"9223372036854775807", 10, 9223372036854775807LL}, + }; + TEST_OK(kstrtos64, s64, "%lld", test_s64_ok); +} + +static void __init test_kstrtos64_fail(void) +{ + static DEFINE_TEST_FAIL(test_s64_fail) = { + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + {"569202370375329612767", 10}, + {"-569202370375329612767", 10}, + }; + TEST_FAIL(kstrtos64, s64, "%lld", test_s64_fail); +} + +static void __init test_kstrtou32_ok(void) +{ + DECLARE_TEST_OK(u32, struct test_u32); + static DEFINE_TEST_OK(struct test_u32, test_u32_ok) = { + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + {"32768", 10, 32768}, + {"32769", 10, 32769}, + {"65534", 10, 65534}, + {"65535", 10, 65535}, + {"65536", 10, 65536}, + {"65537", 10, 65537}, + {"2147483646", 10, 2147483646}, + {"2147483647", 10, 2147483647}, + {"2147483648", 10, 2147483648U}, + {"2147483649", 10, 2147483649U}, + {"4294967294", 10, 4294967294U}, + {"4294967295", 10, 4294967295U}, + }; + TEST_OK(kstrtou32, u32, "%u", test_u32_ok); +} + +static void __init test_kstrtou32_fail(void) +{ + static DEFINE_TEST_FAIL(test_u32_fail) = { + {"-2", 10}, + {"-1", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtou32, u32, "%u", test_u32_fail); +} + +static void __init test_kstrtos32_ok(void) +{ + DECLARE_TEST_OK(s32, struct test_s32); + static DEFINE_TEST_OK(struct test_s32, test_s32_ok) = { + {"-128", 10, -128}, + {"-127", 10, -127}, + {"-1", 10, -1}, + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + {"32768", 10, 32768}, + {"32769", 10, 32769}, + {"65534", 10, 65534}, + {"65535", 10, 65535}, + {"65536", 10, 65536}, + {"65537", 10, 65537}, + {"2147483646", 10, 2147483646}, + {"2147483647", 10, 2147483647}, + }; + TEST_OK(kstrtos32, s32, "%d", test_s32_ok); +} + +static void __init test_kstrtos32_fail(void) +{ + static DEFINE_TEST_FAIL(test_s32_fail) = { + {"2147483648", 10}, + {"2147483649", 10}, + {"4294967294", 10}, + {"4294967295", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtos32, s32, "%d", test_s32_fail); +} + +static void __init test_kstrtou16_ok(void) +{ + DECLARE_TEST_OK(u16, struct test_u16); + static DEFINE_TEST_OK(struct test_u16, test_u16_ok) = { + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + {"32768", 10, 32768}, + {"32769", 10, 32769}, + {"65534", 10, 65534}, + {"65535", 10, 65535}, + }; + TEST_OK(kstrtou16, u16, "%hu", test_u16_ok); +} + +static void __init test_kstrtou16_fail(void) +{ + static DEFINE_TEST_FAIL(test_u16_fail) = { + {"-2", 10}, + {"-1", 10}, + {"65536", 10}, + {"65537", 10}, + {"2147483646", 10}, + {"2147483647", 10}, + {"2147483648", 10}, + {"2147483649", 10}, + {"4294967294", 10}, + {"4294967295", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtou16, u16, "%hu", test_u16_fail); +} + +static void __init test_kstrtos16_ok(void) +{ + DECLARE_TEST_OK(s16, struct test_s16); + static DEFINE_TEST_OK(struct test_s16, test_s16_ok) = { + {"-130", 10, -130}, + {"-129", 10, -129}, + {"-128", 10, -128}, + {"-127", 10, -127}, + {"-1", 10, -1}, + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + {"256", 10, 256}, + {"257", 10, 257}, + {"32766", 10, 32766}, + {"32767", 10, 32767}, + }; + TEST_OK(kstrtos16, s16, "%hd", test_s16_ok); +} + +static void __init test_kstrtos16_fail(void) +{ + static DEFINE_TEST_FAIL(test_s16_fail) = { + {"32768", 10}, + {"32769", 10}, + {"65534", 10}, + {"65535", 10}, + {"65536", 10}, + {"65537", 10}, + {"2147483646", 10}, + {"2147483647", 10}, + {"2147483648", 10}, + {"2147483649", 10}, + {"4294967294", 10}, + {"4294967295", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtos16, s16, "%hd", test_s16_fail); +} + +static void __init test_kstrtou8_ok(void) +{ + DECLARE_TEST_OK(u8, struct test_u8); + static DEFINE_TEST_OK(struct test_u8, test_u8_ok) = { + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + {"128", 10, 128}, + {"129", 10, 129}, + {"254", 10, 254}, + {"255", 10, 255}, + }; + TEST_OK(kstrtou8, u8, "%hhu", test_u8_ok); +} + +static void __init test_kstrtou8_fail(void) +{ + static DEFINE_TEST_FAIL(test_u8_fail) = { + {"-2", 10}, + {"-1", 10}, + {"256", 10}, + {"257", 10}, + {"32766", 10}, + {"32767", 10}, + {"32768", 10}, + {"32769", 10}, + {"65534", 10}, + {"65535", 10}, + {"65536", 10}, + {"65537", 10}, + {"2147483646", 10}, + {"2147483647", 10}, + {"2147483648", 10}, + {"2147483649", 10}, + {"4294967294", 10}, + {"4294967295", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtou8, u8, "%hhu", test_u8_fail); +} + +static void __init test_kstrtos8_ok(void) +{ + DECLARE_TEST_OK(s8, struct test_s8); + static DEFINE_TEST_OK(struct test_s8, test_s8_ok) = { + {"-128", 10, -128}, + {"-127", 10, -127}, + {"-1", 10, -1}, + {"0", 10, 0}, + {"1", 10, 1}, + {"126", 10, 126}, + {"127", 10, 127}, + }; + TEST_OK(kstrtos8, s8, "%hhd", test_s8_ok); +} + +static void __init test_kstrtos8_fail(void) +{ + static DEFINE_TEST_FAIL(test_s8_fail) = { + {"-130", 10}, + {"-129", 10}, + {"128", 10}, + {"129", 10}, + {"254", 10}, + {"255", 10}, + {"256", 10}, + {"257", 10}, + {"32766", 10}, + {"32767", 10}, + {"32768", 10}, + {"32769", 10}, + {"65534", 10}, + {"65535", 10}, + {"65536", 10}, + {"65537", 10}, + {"2147483646", 10}, + {"2147483647", 10}, + {"2147483648", 10}, + {"2147483649", 10}, + {"4294967294", 10}, + {"4294967295", 10}, + {"4294967296", 10}, + {"4294967297", 10}, + {"9223372036854775806", 10}, + {"9223372036854775807", 10}, + {"9223372036854775808", 10}, + {"9223372036854775809", 10}, + {"18446744073709551614", 10}, + {"18446744073709551615", 10}, + {"18446744073709551616", 10}, + {"18446744073709551617", 10}, + }; + TEST_FAIL(kstrtos8, s8, "%hhd", test_s8_fail); +} + +static void __init test_kstrtoudec64_ok(void) +{ + DECLARE_TEST_OK(u64, struct test_udec64); + static DEFINE_TEST_OK(struct test_udec64, test_udec64_ok) = { + /* basic: integer.fraction, exact digits */ + {"0.0", 1, 0}, + {"1.5", 1, 15}, + {"1.234", 3, 1234}, + {"42.0", 1, 420}, + /* zero */ + {"0.0", 1, 0}, + {"0.000", 3, 0}, + /* integer only */ + {"0", 1, 0}, + {"42", 3, 42000}, + {"123.", 2, 12300}, + {"1", 1, 10}, + /* fractional only (leading dot) */ + {".5", 1, 5}, + {".5", 0, 0}, + {".123", 3, 123}, + {".001", 3, 1}, + /* zero padding: fewer fractional digits than scale */ + {"1.2", 3, 1200}, + {"1.2", 6, 1200000}, + {"0.01", 3, 10}, + {"0.1", 9, 100000000ULL}, + {"0.01", 9, 10000000}, + /* truncation: more fractional digits than scale */ + {"1.23456", 3, 1234}, + {"3.1415926535", 6, 3141592}, + {"0.999999999", 3, 999}, + {"1.99", 1, 19}, + {"1.234", 0, 1}, + /* trailing newline */ + {"1.5\n", 1, 15}, + {"42\n", 3, 42000}, + /* plus sign */ + {"+1.5", 1, 15}, + {"+.5", 1, 5}, + /* scale progression */ + {"1.", 0, 1}, + {"1.0", 1, 10}, + {"1.00", 2, 100}, + {"1.000", 3, 1000}, + {"1.000000", 6, 1000000}, + {"1.000000000", 9, 1000000000ULL}, + /* max limit check */ + {"18446744073.709551615", 9, ULLONG_MAX}, + {"18446744073709.551615", 6, ULLONG_MAX}, + {"0.18446744073709551615", 20, ULLONG_MAX}, + /* scale > 19: representable when integer part is small */ + {"0.00000000000000000001", 20, 1}, + {"0.1", 20, 10000000000000000000ULL}, + {"0.00000000000000000000001", 23, 1}, + /* truncation with scale > 19 */ + {"0.0000000000000000000012345", 23, 123}, + /* truncation with many excess digits */ + {"0.00000000000000000000000000000000423", 34, 42}, + {"1.99999999999999999999999999999999999", 3, 1999}, + }; + TEST_OK(kstrtoudec64, u64, "%llu", test_udec64_ok); +} + +static void __init test_kstrtoudec64_fail(void) +{ + static DEFINE_TEST_FAIL(test_udec64_fail) = { + /* empty / whitespace */ + {"", 3}, + {"\n", 3}, + /* minus sign (unsigned) */ + {"-1.5", 1}, + {"-0.5", 1}, + /* only a decimal point */ + {".", 3}, + {".", 0}, + /* only a sign */ + {"+", 3}, + /* non-digit characters */ + {"abc", 3}, + {"1.2x", 3}, + /* leading/trailing space */ + {" 1.5", 1}, + {"1.5 ", 1}, + /* overflow */ + {"18446744073710.551615", 6}, + {"99999999999999999999", 1}, + /* overflow with scale > 19 */ + {"1.0", 21}, + {"0.2", 20}, + {"0.18446744073709551616", 20}, + {"1", 20}, + }; + TEST_FAIL(kstrtoudec64, u64, "%llu", test_udec64_fail); +} + +static void __init test_kstrtodec64_ok(void) +{ + DECLARE_TEST_OK(s64, struct test_dec64); + static DEFINE_TEST_OK(struct test_dec64, test_dec64_ok) = { + /* basic positive */ + {"0.0", 1, 0}, + {"1.5", 1, 15}, + {"1.234", 3, 1234}, + /* basic negative */ + {"-1.5", 1, -15}, + {"-1.234", 3, -1234}, + {"-0.5", 1, -5}, + {"-0.001", 3, -1}, + /* zero (signed) */ + {"-0", 1, 0}, + {"-0.0", 1, 0}, + {"0.000", 3, 0}, + /* integer only */ + {"42", 3, 42000}, + {"-42", 3, -42000}, + /* fractional only */ + {".5", 1, 5}, + {"-.5", 1, -5}, + /* zero padding */ + {"1.2", 3, 1200}, + {"-1.2", 3, -1200}, + {"0.01", 3, 10}, + {"-0.01", 3, -10}, + /* truncation */ + {"1.23456", 3, 1234}, + {"-1.23456", 3, -1234}, + {"0.999999999", 3, 999}, + {"-0.999999999", 3, -999}, + /* trailing newline */ + {"1.5\n", 1, 15}, + {"-1.5\n", 1, -15}, + /* plus sign */ + {"+1.5", 1, 15}, + /* limits */ + {"9223372036.854775807", 9, LLONG_MAX}, + {"-9223372036.854775808", 9, LLONG_MIN}, + /* scale > 19 */ + {"0.0", 20, 0}, + {"-0.0", 20, 0}, + {"0.00000000000000000001", 20, 1}, + {"-0.00000000000000000001", 20, -1}, + {"0.009223372036854775807", 21, LLONG_MAX}, + {"-0.009223372036854775808", 21, LLONG_MIN}, + }; + TEST_OK(kstrtodec64, s64, "%lld", test_dec64_ok); +} + +static void __init test_kstrtodec64_fail(void) +{ + static DEFINE_TEST_FAIL(test_dec64_fail) = { + /* empty / whitespace */ + {"", 3}, + {"\n", 3}, + /* no digits after dot */ + {".", 3}, + {"-.", 3}, + /* no digits at all */ + {"+", 3}, + {"-", 3}, + /* non-digit characters */ + {"abc", 3}, + {"-1.2x", 3}, + /* signed overflow */ + {"9223372036.854775808", 9}, + {"-9223372036.854775809", 9}, + {"99999999999999999999", 1}, + /* signed overflow with scale > 19 */ + {"0.1", 20}, + {"-0.1", 20}, + {"0.09223372036854775808", 20}, + {"-0.09223372036854775809", 20}, + }; + TEST_FAIL(kstrtodec64, s64, "%lld", test_dec64_fail); +} + +static int __init test_kstrtox_init(void) +{ + test_kstrtoull_ok(); + test_kstrtoull_fail(); + test_kstrtoll_ok(); + test_kstrtoll_fail(); + + test_kstrtou64_ok(); + test_kstrtou64_fail(); + test_kstrtos64_ok(); + test_kstrtos64_fail(); + + test_kstrtou32_ok(); + test_kstrtou32_fail(); + test_kstrtos32_ok(); + test_kstrtos32_fail(); + + test_kstrtou16_ok(); + test_kstrtou16_fail(); + test_kstrtos16_ok(); + test_kstrtos16_fail(); + + test_kstrtou8_ok(); + test_kstrtou8_fail(); + test_kstrtos8_ok(); + test_kstrtos8_fail(); + + test_kstrtoudec64_ok(); + test_kstrtoudec64_fail(); + test_kstrtodec64_ok(); + test_kstrtodec64_fail(); + + return -EINVAL; +} +module_init(test_kstrtox_init); +MODULE_DESCRIPTION("Module test for kstrto*() APIs"); +MODULE_LICENSE("Dual BSD/GPL"); -- cgit v1.3.1