diff options
Diffstat (limited to 'tools/testing/selftests/proc')
| -rw-r--r-- | tools/testing/selftests/proc/proc-empty-vm.c | 182 |
1 files changed, 157 insertions, 25 deletions
diff --git a/tools/testing/selftests/proc/proc-empty-vm.c b/tools/testing/selftests/proc/proc-empty-vm.c index ee71ce52cb..56198d4ca2 100644 --- a/tools/testing/selftests/proc/proc-empty-vm.c +++ b/tools/testing/selftests/proc/proc-empty-vm.c @@ -23,6 +23,9 @@ * /proc/${pid}/smaps * /proc/${pid}/smaps_rollup */ +#undef _GNU_SOURCE +#define _GNU_SOURCE + #undef NDEBUG #include <assert.h> #include <errno.h> @@ -34,6 +37,7 @@ #include <sys/mman.h> #include <sys/ptrace.h> #include <sys/resource.h> +#include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> @@ -42,6 +46,43 @@ #define TEST_VSYSCALL #endif +#if defined __amd64__ + #ifndef SYS_pkey_alloc + #define SYS_pkey_alloc 330 + #endif + #ifndef SYS_pkey_free + #define SYS_pkey_free 331 + #endif +#elif defined __i386__ + #ifndef SYS_pkey_alloc + #define SYS_pkey_alloc 381 + #endif + #ifndef SYS_pkey_free + #define SYS_pkey_free 382 + #endif +#else + #error "SYS_pkey_alloc" +#endif + +static int g_protection_key_support; + +static int protection_key_support(void) +{ + long rv = syscall(SYS_pkey_alloc, 0, 0); + if (rv > 0) { + syscall(SYS_pkey_free, (int)rv); + return 1; + } else if (rv == -1 && errno == ENOSYS) { + return 0; + } else if (rv == -1 && errno == EINVAL) { + // ospke=n + return 0; + } else { + fprintf(stderr, "%s: error: rv %ld, errno %d\n", __func__, rv, errno); + exit(EXIT_FAILURE); + } +} + /* * 0: vsyscall VMA doesn't exist vsyscall=none * 1: vsyscall VMA is --xp vsyscall=xonly @@ -60,7 +101,7 @@ static const char proc_pid_maps_vsyscall_2[] = static const char proc_pid_smaps_vsyscall_0[] = ""; static const char proc_pid_smaps_vsyscall_1[] = -"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]\n" +"ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall]\n" "Size: 4 kB\n" "KernelPageSize: 4 kB\n" "MMUPageSize: 4 kB\n" @@ -73,6 +114,7 @@ static const char proc_pid_smaps_vsyscall_1[] = "Private_Dirty: 0 kB\n" "Referenced: 0 kB\n" "Anonymous: 0 kB\n" +"KSM: 0 kB\n" "LazyFree: 0 kB\n" "AnonHugePages: 0 kB\n" "ShmemPmdMapped: 0 kB\n" @@ -83,14 +125,10 @@ static const char proc_pid_smaps_vsyscall_1[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/* - * "ProtectionKey:" field is conditional. It is possible to check it as well, - * but I don't have such machine. - */ ; static const char proc_pid_smaps_vsyscall_2[] = -"ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall]\n" +"ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]\n" "Size: 4 kB\n" "KernelPageSize: 4 kB\n" "MMUPageSize: 4 kB\n" @@ -103,6 +141,7 @@ static const char proc_pid_smaps_vsyscall_2[] = "Private_Dirty: 0 kB\n" "Referenced: 0 kB\n" "Anonymous: 0 kB\n" +"KSM: 0 kB\n" "LazyFree: 0 kB\n" "AnonHugePages: 0 kB\n" "ShmemPmdMapped: 0 kB\n" @@ -113,10 +152,6 @@ static const char proc_pid_smaps_vsyscall_2[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/* - * "ProtectionKey:" field is conditional. It is possible to check it as well, - * but I'm too tired. - */ ; static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___) @@ -238,19 +273,27 @@ static int test_proc_pid_smaps(pid_t pid) } perror("open /proc/${pid}/smaps"); return EXIT_FAILURE; + } + ssize_t rv = read(fd, buf, sizeof(buf)); + close(fd); + + assert(0 <= rv); + assert(rv <= sizeof(buf)); + + if (g_vsyscall == 0) { + assert(rv == 0); } else { - ssize_t rv = read(fd, buf, sizeof(buf)); - close(fd); - if (g_vsyscall == 0) { - assert(rv == 0); - } else { - size_t len = strlen(g_proc_pid_maps_vsyscall); - /* TODO "ProtectionKey:" */ - assert(rv > len); - assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0); + size_t len = strlen(g_proc_pid_smaps_vsyscall); + assert(rv > len); + assert(memcmp(buf, g_proc_pid_smaps_vsyscall, len) == 0); + + if (g_protection_key_support) { +#define PROTECTION_KEY "ProtectionKey: 0\n" + assert(memmem(buf, rv, PROTECTION_KEY, strlen(PROTECTION_KEY))); } - return EXIT_SUCCESS; } + + return EXIT_SUCCESS; } static const char g_smaps_rollup[] = @@ -303,6 +346,95 @@ static int test_proc_pid_smaps_rollup(pid_t pid) } } +static const char *parse_u64(const char *p, const char *const end, uint64_t *rv) +{ + *rv = 0; + for (; p != end; p += 1) { + if ('0' <= *p && *p <= '9') { + assert(!__builtin_mul_overflow(*rv, 10, rv)); + assert(!__builtin_add_overflow(*rv, *p - '0', rv)); + } else { + break; + } + } + assert(p != end); + return p; +} + +/* + * There seems to be 2 types of valid output: + * "0 A A B 0 0 0\n" for dynamic exeuctables, + * "0 0 0 B 0 0 0\n" for static executables. + */ +static int test_proc_pid_statm(pid_t pid) +{ + char buf[4096]; + snprintf(buf, sizeof(buf), "/proc/%u/statm", pid); + int fd = open(buf, O_RDONLY); + if (fd == -1) { + perror("open /proc/${pid}/statm"); + return EXIT_FAILURE; + } + + ssize_t rv = read(fd, buf, sizeof(buf)); + close(fd); + + assert(rv >= 0); + assert(rv <= sizeof(buf)); + if (0) { + write(1, buf, rv); + } + + const char *p = buf; + const char *const end = p + rv; + + /* size */ + assert(p != end && *p++ == '0'); + assert(p != end && *p++ == ' '); + + uint64_t resident; + p = parse_u64(p, end, &resident); + assert(p != end && *p++ == ' '); + + uint64_t shared; + p = parse_u64(p, end, &shared); + assert(p != end && *p++ == ' '); + + uint64_t text; + p = parse_u64(p, end, &text); + assert(p != end && *p++ == ' '); + + assert(p != end && *p++ == '0'); + assert(p != end && *p++ == ' '); + + /* data */ + assert(p != end && *p++ == '0'); + assert(p != end && *p++ == ' '); + + assert(p != end && *p++ == '0'); + assert(p != end && *p++ == '\n'); + + assert(p == end); + + /* + * "text" is "mm->end_code - mm->start_code" at execve(2) time. + * munmap() doesn't change it. It can be anything (just link + * statically). It can't be 0 because executing to this point + * implies at least 1 page of code. + */ + assert(text > 0); + + /* + * These two are always equal. Always 0 for statically linked + * executables and sometimes 0 for dynamically linked executables. + * There is no way to tell one from another without parsing ELF + * which is too much for this test. + */ + assert(resident == shared); + + return EXIT_SUCCESS; +} + int main(void) { int rv = EXIT_SUCCESS; @@ -328,6 +460,8 @@ int main(void) abort(); } + g_protection_key_support = protection_key_support(); + pid_t pid = fork(); if (pid == -1) { perror("fork"); @@ -389,11 +523,9 @@ int main(void) if (rv == EXIT_SUCCESS) { rv = test_proc_pid_smaps_rollup(pid); } - /* - * TODO test /proc/${pid}/statm, task_statm() - * ->start_code, ->end_code aren't updated by munmap(). - * Output can be "0 0 0 2 0 0 0\n" where "2" can be anything. - */ + if (rv == EXIT_SUCCESS) { + rv = test_proc_pid_statm(pid); + } /* Cut the rope. */ int wstatus; |