Character handling functions, like isspace(3), expect a value representable as unsigned char or equal to EOF. Otherwise the behavior is undefined. See https://wiki.sei.cmu.edu/confluence/display/c/STR37-C.+Arguments+to+character-handling+functions+must+be+representable+as+an+unsigned+char Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx> --- v3: - compute_create.c: avoid cast by changing type of variable - drop RFC and split from original patch set --- libselinux/src/booleans.c | 8 ++++---- libselinux/src/compute_create.c | 2 +- libselinux/src/get_context_list.c | 12 ++++++------ libselinux/src/get_default_type.c | 2 +- libselinux/src/label_file.c | 8 ++++---- libselinux/src/label_media.c | 2 +- libselinux/src/label_support.c | 8 ++++---- libselinux/src/label_x.c | 2 +- libselinux/src/load_policy.c | 2 +- libselinux/src/matchmediacon.c | 6 +++--- libselinux/src/selinux_check_securetty_context.c | 4 ++-- libselinux/src/selinux_config.c | 12 ++++++------ libselinux/src/seusers.c | 6 +++--- 13 files changed, 37 insertions(+), 37 deletions(-) diff --git a/libselinux/src/booleans.c b/libselinux/src/booleans.c index e34b39ff..c557df65 100644 --- a/libselinux/src/booleans.c +++ b/libselinux/src/booleans.c @@ -107,7 +107,7 @@ char *selinux_boolean_sub(const char *name) char *ptr; char *src = line_buf; char *dst; - while (*src && isspace(*src)) + while (*src && isspace((unsigned char)*src)) src++; if (!*src) continue; @@ -115,19 +115,19 @@ char *selinux_boolean_sub(const char *name) continue; ptr = src; - while (*ptr && !isspace(*ptr)) + while (*ptr && !isspace((unsigned char)*ptr)) ptr++; *ptr++ = '\0'; if (strcmp(src, name) != 0) continue; dst = ptr; - while (*dst && isspace(*dst)) + while (*dst && isspace((unsigned char)*dst)) dst++; if (!*dst) continue; ptr = dst; - while (*ptr && !isspace(*ptr)) + while (*ptr && !isspace((unsigned char)*ptr)) ptr++; *ptr = '\0'; diff --git a/libselinux/src/compute_create.c b/libselinux/src/compute_create.c index e9f3c96a..d19baa0b 100644 --- a/libselinux/src/compute_create.c +++ b/libselinux/src/compute_create.c @@ -13,7 +13,7 @@ static int object_name_encode(const char *objname, char *buffer, size_t buflen) { - int code; + unsigned char code; size_t offset = 0; if (buflen - offset < 1) diff --git a/libselinux/src/get_context_list.c b/libselinux/src/get_context_list.c index d774b9cf..0342823c 100644 --- a/libselinux/src/get_context_list.c +++ b/libselinux/src/get_context_list.c @@ -170,27 +170,27 @@ static int get_context_user(FILE * fp, /* Skip leading whitespace. */ start = line; - while (*start && isspace(*start)) + while (*start && isspace((unsigned char)*start)) start++; if (!(*start)) continue; /* Find the end of the (partial) fromcon in the line. */ end = start; - while (*end && !isspace(*end)) + while (*end && !isspace((unsigned char)*end)) end++; if (!(*end)) continue; /* Check for a match. */ linerole = start; - while (*start && !isspace(*start) && *start != ':') + while (*start && !isspace((unsigned char)*start) && *start != ':') start++; if (*start != ':') continue; *start = 0; linetype = ++start; - while (*start && !isspace(*start) && *start != ':') + while (*start && !isspace((unsigned char)*start) && *start != ':') start++; if (!(*start)) continue; @@ -210,14 +210,14 @@ static int get_context_user(FILE * fp, start = ++end; while (*start) { /* Skip leading whitespace */ - while (*start && isspace(*start)) + while (*start && isspace((unsigned char)*start)) start++; if (!(*start)) break; /* Find the end of this partial context. */ end = start; - while (*end && !isspace(*end)) + while (*end && !isspace((unsigned char)*end)) end++; if (*end) *end++ = 0; diff --git a/libselinux/src/get_default_type.c b/libselinux/src/get_default_type.c index 766ea4b7..87e9c72c 100644 --- a/libselinux/src/get_default_type.c +++ b/libselinux/src/get_default_type.c @@ -42,7 +42,7 @@ static int find_default_type(FILE * fp, const char *role, char **type) buf[strlen(buf) - 1] = 0; ptr = buf; - while (*ptr && isspace(*ptr)) + while (*ptr && isspace((unsigned char)*ptr)) ptr++; if (!(*ptr)) continue; diff --git a/libselinux/src/label_file.c b/libselinux/src/label_file.c index a665c9b4..4778f8f8 100644 --- a/libselinux/src/label_file.c +++ b/libselinux/src/label_file.c @@ -708,20 +708,20 @@ static int selabel_subs_init(const char *path, struct selabel_digest *digest, char *src = buf; char *dst = NULL; - while (*src && isspace(*src)) + while (*src && isspace((unsigned char)*src)) src++; if (src[0] == '#') continue; ptr = src; - while (*ptr && ! isspace(*ptr)) + while (*ptr && ! isspace((unsigned char)*ptr)) ptr++; *ptr++ = '\0'; if (! *src) continue; dst = ptr; - while (*dst && isspace(*dst)) + while (*dst && isspace((unsigned char)*dst)) dst++; ptr = dst; - while (*ptr && ! isspace(*ptr)) + while (*ptr && ! isspace((unsigned char)*ptr)) ptr++; *ptr = '\0'; if (! *dst) diff --git a/libselinux/src/label_media.c b/libselinux/src/label_media.c index d33b614a..b3443b47 100644 --- a/libselinux/src/label_media.c +++ b/libselinux/src/label_media.c @@ -39,7 +39,7 @@ static int process_line(const char *path, char *line_buf, int pass, char *key, *context; buf_p = line_buf; - while (isspace(*buf_p)) + while (isspace((unsigned char)*buf_p)) buf_p++; /* Skip comment lines and empty lines. */ if (*buf_p == '#' || *buf_p == 0) diff --git a/libselinux/src/label_support.c b/libselinux/src/label_support.c index 49f72b1c..f7ab9292 100644 --- a/libselinux/src/label_support.c +++ b/libselinux/src/label_support.c @@ -26,14 +26,14 @@ static inline int read_spec_entry(char **entry, char **ptr, int *len, const char *entry = NULL; char *tmp_buf = NULL; - while (isspace(**ptr) && **ptr != '\0') + while (isspace((unsigned char)**ptr) && **ptr != '\0') (*ptr)++; tmp_buf = *ptr; *len = 0; - while (!isspace(**ptr) && **ptr != '\0') { - if (!isascii(**ptr)) { + while (!isspace((unsigned char)**ptr) && **ptr != '\0') { + if (!isascii((unsigned char)**ptr)) { errno = EINVAL; *errbuf = "Non-ASCII characters found"; return -1; @@ -80,7 +80,7 @@ int read_spec_entries(char *line_buf, const char **errbuf, int num_args, ...) len++; buf_p = line_buf; - while (isspace(*buf_p)) + while (isspace((unsigned char)*buf_p)) buf_p++; /* Skip comment lines and empty lines. */ diff --git a/libselinux/src/label_x.c b/libselinux/src/label_x.c index 4b8f524f..e15190ca 100644 --- a/libselinux/src/label_x.c +++ b/libselinux/src/label_x.c @@ -41,7 +41,7 @@ static int process_line(const char *path, char *line_buf, int pass, char *type, *key, *context; buf_p = line_buf; - while (isspace(*buf_p)) + while (isspace((unsigned char)*buf_p)) buf_p++; /* Skip comment lines and empty lines. */ if (*buf_p == '#' || *buf_p == 0) diff --git a/libselinux/src/load_policy.c b/libselinux/src/load_policy.c index 17918e8b..57d7aaef 100644 --- a/libselinux/src/load_policy.c +++ b/libselinux/src/load_policy.c @@ -252,7 +252,7 @@ int selinux_init_load_policy(int *enforce) } if (fgets(buf, selinux_page_size, cfg) && (tmp = strstr(buf, "enforcing="))) { - if (tmp == buf || isspace(*(tmp - 1))) { + if (tmp == buf || isspace((unsigned char)*(tmp - 1))) { secmdline = atoi(tmp + sizeof("enforcing=") - 1); } diff --git a/libselinux/src/matchmediacon.c b/libselinux/src/matchmediacon.c index d3d95043..6ba87b99 100644 --- a/libselinux/src/matchmediacon.c +++ b/libselinux/src/matchmediacon.c @@ -29,7 +29,7 @@ int matchmediacon(const char *media, char ** con) current_line[strlen(current_line) - 1] = 0; /* Skip leading whitespace before the partial context. */ ptr = current_line; - while (*ptr && isspace(*ptr)) + while (*ptr && isspace((unsigned char)*ptr)) ptr++; if (!(*ptr)) @@ -37,7 +37,7 @@ int matchmediacon(const char *media, char ** con) /* Find the end of the media context. */ ptr2 = ptr; - while (*ptr2 && !isspace(*ptr2)) + while (*ptr2 && !isspace((unsigned char)*ptr2)) ptr2++; if (!(*ptr2)) continue; @@ -53,7 +53,7 @@ int matchmediacon(const char *media, char ** con) return -1; /* Skip whitespace. */ - while (*ptr2 && isspace(*ptr2)) + while (*ptr2 && isspace((unsigned char)*ptr2)) ptr2++; if (!(*ptr2)) { return -1; diff --git a/libselinux/src/selinux_check_securetty_context.c b/libselinux/src/selinux_check_securetty_context.c index c5c557fd..7609752e 100644 --- a/libselinux/src/selinux_check_securetty_context.c +++ b/libselinux/src/selinux_check_securetty_context.c @@ -26,13 +26,13 @@ int selinux_check_securetty_context(const char * tty_context) /* Skip leading whitespace. */ start = line; - while (*start && isspace(*start)) + while (*start && isspace((unsigned char)*start)) start++; if (!(*start)) continue; end = start; - while (*end && !isspace(*end)) + while (*end && !isspace((unsigned char)*end)) end++; if (*end) *end++ = 0; diff --git a/libselinux/src/selinux_config.c b/libselinux/src/selinux_config.c index d2e49ee1..1d8cfb71 100644 --- a/libselinux/src/selinux_config.c +++ b/libselinux/src/selinux_config.c @@ -103,7 +103,7 @@ int selinux_getenforcemode(int *enforce) if (strncmp(buf, SELINUXTAG, len)) continue; tag = buf+len; - while (isspace(*tag)) + while (isspace((unsigned char)*tag)) tag++; if (!strncasecmp (tag, "enforcing", sizeof("enforcing") - 1)) { @@ -173,7 +173,7 @@ static void init_selinux_config(void) if (line_buf[len - 1] == '\n') line_buf[len - 1] = 0; buf_p = line_buf; - while (isspace(*buf_p)) + while (isspace((unsigned char)*buf_p)) buf_p++; if (*buf_p == '#' || *buf_p == 0) continue; @@ -181,7 +181,7 @@ static void init_selinux_config(void) if (!strncasecmp(buf_p, SELINUXTYPETAG, sizeof(SELINUXTYPETAG) - 1)) { buf_p += sizeof(SELINUXTYPETAG) - 1; - while (isspace(*buf_p)) + while (isspace((unsigned char)*buf_p)) buf_p++; type = strdup(buf_p); if (!type) { @@ -191,7 +191,7 @@ static void init_selinux_config(void) } end = type + strlen(type) - 1; while ((end > type) && - (isspace(*end) || iscntrl(*end))) { + (isspace((unsigned char)*end) || iscntrl((unsigned char)*end))) { *end = 0; end--; } @@ -206,14 +206,14 @@ static void init_selinux_config(void) } else if (!strncmp(buf_p, REQUIRESEUSERS, sizeof(REQUIRESEUSERS) - 1)) { value = buf_p + sizeof(REQUIRESEUSERS) - 1; - while (isspace(*value)) + while (isspace((unsigned char)*value)) value++; intptr = &require_seusers; } else { continue; } - if (isdigit(*value)) + if (isdigit((unsigned char)*value)) *intptr = atoi(value); else if (strncasecmp(value, "true", sizeof("true") - 1)) *intptr = 1; diff --git a/libselinux/src/seusers.c b/libselinux/src/seusers.c index fff80c1a..6da8c318 100644 --- a/libselinux/src/seusers.c +++ b/libselinux/src/seusers.c @@ -25,7 +25,7 @@ static int process_seusers(const char *buffer, goto err; start = newbuf; - while (isspace(*start)) + while (isspace((unsigned char)*start)) start++; if (*start == '#' || *start == 0) { free(newbuf); @@ -46,7 +46,7 @@ static int process_seusers(const char *buffer, mls_found = 0; end = start; - while (*end && !isspace(*end)) + while (*end && !isspace((unsigned char)*end)) end++; } *end = 0; @@ -63,7 +63,7 @@ static int process_seusers(const char *buffer, goto out; start = ++end; - while (*end && !isspace(*end)) + while (*end && !isspace((unsigned char)*end)) end++; *end = 0; -- 2.42.0
