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[msan] Intercept *getxattr and *listxattr.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@200464 91177308-0d34-0410-b5e6-96231b3b80d8
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // RUN: %clangxx_msan -m64 -O0 %s -o %t && %t %p 2>&1 | ||
| // RUN: %clangxx_msan -m64 -O0 -D_FILE_OFFSET_BITS=64 %s -o %t && %t %p 2>&1 | ||
| // RUN: %clangxx_msan -m64 -O3 %s -o %t && %t %p 2>&1 | ||
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| #include <argz.h> | ||
| #include <assert.h> | ||
| #include <sys/types.h> | ||
| #include <errno.h> | ||
| #include <fcntl.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| #include <sanitizer/msan_interface.h> | ||
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| // Do not depend on libattr headers. | ||
| #ifndef ENOATTR | ||
| #define ENOATTR ENODATA | ||
| #endif | ||
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| extern "C" { | ||
| ssize_t listxattr(const char *path, char *list, size_t size); | ||
| ssize_t llistxattr(const char *path, char *list, size_t size); | ||
| ssize_t flistxattr(int fd, char *list, size_t size); | ||
| ssize_t getxattr(const char *path, const char *name, void *value, size_t size); | ||
| ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size); | ||
| ssize_t fgetxattr(int fd, const char *name, void *value, size_t size); | ||
| } | ||
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| char g_path[1024]; | ||
| int g_fd; | ||
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| // Life before closures... | ||
| ssize_t listxattr_wrapper(char *buf, size_t size) { | ||
| return listxattr(g_path, buf, size); | ||
| } | ||
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| ssize_t llistxattr_wrapper(char *buf, size_t size) { | ||
| return llistxattr(g_path, buf, size); | ||
| } | ||
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| ssize_t flistxattr_wrapper(char *buf, size_t size) { | ||
| return flistxattr(g_fd, buf, size); | ||
| } | ||
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| ssize_t getxattr_wrapper(const char *name, char *buf, size_t size) { | ||
| return getxattr(g_path, name, buf, size); | ||
| } | ||
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| ssize_t lgetxattr_wrapper(const char *name, char *buf, size_t size) { | ||
| return lgetxattr(g_path, name, buf, size); | ||
| } | ||
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| ssize_t fgetxattr_wrapper(const char *name, char *buf, size_t size) { | ||
| return fgetxattr(g_fd, name, buf, size); | ||
| } | ||
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| size_t test_list(ssize_t fun(char*, size_t), char **buf) { | ||
| int buf_size = 1024; | ||
| while (true) { | ||
| *buf = (char *)malloc(buf_size); | ||
| assert(__msan_test_shadow(*buf, buf_size) != -1); | ||
| ssize_t res = fun(*buf, buf_size); | ||
| if (res >= 0) { | ||
| assert(__msan_test_shadow(*buf, buf_size) == res); | ||
| return res; | ||
| } | ||
| if (errno == ENOTSUP) { | ||
| printf("Extended attributes are disabled. *xattr test is a no-op.\n"); | ||
| exit(0); | ||
| } | ||
| assert(errno == ERANGE); | ||
| free(*buf); | ||
| buf_size *= 2; | ||
| } | ||
| } | ||
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| // True means success. False means result inconclusive because we don't have | ||
| // access to this attribute. | ||
| bool test_get_single_attr(ssize_t fun(const char *, char *, size_t), | ||
| const char *attr_name) { | ||
| char *buf; | ||
| int buf_size = 1024; | ||
| while (true) { | ||
| buf = (char *)malloc(buf_size); | ||
| assert(__msan_test_shadow(buf, buf_size) != -1); | ||
| ssize_t res = fun(attr_name, buf, buf_size); | ||
| if (res >= 0) { | ||
| assert(__msan_test_shadow(buf, buf_size) == res); | ||
| free(buf); | ||
| return true; | ||
| } | ||
| if (errno == ENOTSUP) { | ||
| printf("Extended attributes are disabled. *xattr test is a no-op.\n"); | ||
| exit(0); | ||
| } | ||
| if (errno == ENOATTR) | ||
| return false; | ||
| assert(errno == ERANGE); | ||
| free(buf); | ||
| buf_size *= 2; | ||
| } | ||
| } | ||
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| void test_get(ssize_t fun(const char *, char *, size_t), const char *attr_list, | ||
| size_t attr_list_size) { | ||
| // Try every attribute, until we see one we can access. Attribute names are | ||
| // null-separated strings in attr_list. | ||
| size_t attr_list_len = argz_count(attr_list, attr_list_size); | ||
| char **attrs = (char **)malloc((attr_list_len + 1) * sizeof(char *)); | ||
| size_t i; | ||
| for (i = 0; (i < attr_list_len) && attrs[i]; i++) { | ||
| if (test_get_single_attr(fun, attrs[i])) | ||
| return; | ||
| } | ||
| printf("*xattr test could not access any attributes.\n"); | ||
| } | ||
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| // TODO: set some attributes before trying to retrieve them with *getxattr. | ||
| // Currently the list is empty, so *getxattr is not tested. | ||
| int main(int argc, char *argv[]) { | ||
| assert(argc == 2); | ||
| snprintf(g_path, sizeof(g_path), "%s/%s", argv[1], "xattr_test_root/a"); | ||
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| g_fd = open(g_path, O_RDONLY); | ||
| assert(g_fd); | ||
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| char *attr_list; | ||
| size_t attr_list_size; | ||
| attr_list_size = test_list(listxattr_wrapper, &attr_list); | ||
| free(attr_list); | ||
| attr_list_size = test_list(llistxattr_wrapper, &attr_list); | ||
| free(attr_list); | ||
| attr_list_size = test_list(flistxattr_wrapper, &attr_list); | ||
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| test_get(getxattr_wrapper, attr_list, attr_list_size); | ||
| test_get(lgetxattr_wrapper, attr_list, attr_list_size); | ||
| test_get(fgetxattr_wrapper, attr_list, attr_list_size); | ||
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| free(attr_list); | ||
| return 0; | ||
| } |
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