From: David Goulet Date: Wed, 3 Aug 2011 21:11:44 +0000 (-0400) Subject: Improve protection around strncpy and memcpy calls X-Git-Tag: v2.0-pre7~14 X-Git-Url: http://git.lttng.org/?a=commitdiff_plain;h=eb3544535ec698874b2e856c520e3ebf36e8fe93;p=lttng-tools.git Improve protection around strncpy and memcpy calls Add copy_string which check for null pointer and add the null terminated byte by default. All pointer pass to memcpy are checked for null value. All lttng_domain pointer are checked also for null value. Signed-off-by: David Goulet --- diff --git a/liblttngctl/liblttngctl.c b/liblttngctl/liblttngctl.c index 17bb4105a..f8e8d9749 100644 --- a/liblttngctl/liblttngctl.c +++ b/liblttngctl/liblttngctl.c @@ -279,22 +279,36 @@ end: } /* - * Copy domain to lttcomm_session_msg domain. - * - * Return -1 if the domain is unkown. + * Copy domain to lttcomm_session_msg domain. If unknown domain, default domain + * will be the kernel. */ -static int copy_lttng_domain(struct lttng_domain *dom) +static void copy_lttng_domain(struct lttng_domain *dom) { - switch (dom->type) { - case LTTNG_DOMAIN_KERNEL: - case LTTNG_DOMAIN_UST: - case LTTNG_DOMAIN_UST_EXEC_NAME: - case LTTNG_DOMAIN_UST_PID: - case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: - memcpy(&lsm.domain, dom, sizeof(struct lttng_domain)); - return 0; - default: - return -1; + if (dom) { + switch (dom->type) { + case LTTNG_DOMAIN_KERNEL: + case LTTNG_DOMAIN_UST: + case LTTNG_DOMAIN_UST_EXEC_NAME: + case LTTNG_DOMAIN_UST_PID: + case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: + memcpy(&lsm.domain, dom, sizeof(struct lttng_domain)); + break; + default: + lsm.domain.type = LTTNG_DOMAIN_KERNEL; + break; + } + } +} + +/* + * Copy string from src to dst and enforce null terminated byte. + */ +static void copy_string(char *dst, const char *src, size_t len) +{ + if (src && dst) { + strncpy(dst, src, len); + /* Enforce the NULL terminated byte */ + dst[len - 1] = '\0'; } } @@ -303,7 +317,7 @@ static int copy_lttng_domain(struct lttng_domain *dom) */ int lttng_start_tracing(const char *session_name) { - strncpy(lsm.session_name, session_name, NAME_MAX); + copy_string(lsm.session_name, session_name, NAME_MAX); return ask_sessiond(LTTNG_START_TRACE, NULL); } @@ -312,7 +326,7 @@ int lttng_start_tracing(const char *session_name) */ int lttng_stop_tracing(const char *session_name) { - strncpy(lsm.session_name, session_name, NAME_MAX); + copy_string(lsm.session_name, session_name, NAME_MAX); return ask_sessiond(LTTNG_STOP_TRACE, NULL); } @@ -323,29 +337,28 @@ int lttng_add_context(struct lttng_domain *domain, struct lttng_event_context *ctx, const char *event_name, const char *channel_name) { - int ret; + int ret = -1; - if (channel_name != NULL) { - strncpy(lsm.u.context.channel_name, channel_name, NAME_MAX); - } + copy_string(lsm.u.context.channel_name, channel_name, NAME_MAX); + copy_string(lsm.u.context.event_name, event_name, NAME_MAX); - if (event_name != NULL) { - strncpy(lsm.u.context.event_name, event_name, NAME_MAX); + if (ctx) { + memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); } - memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); - - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - ret = ask_sessiond(LTTNG_KERNEL_ADD_CONTEXT, NULL); - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + ret = ask_sessiond(LTTNG_KERNEL_ADD_CONTEXT, NULL); + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; + } return ret; } @@ -356,31 +369,33 @@ int lttng_add_context(struct lttng_domain *domain, int lttng_enable_event(struct lttng_domain *domain, struct lttng_event *ev, const char *channel_name) { - int ret; + int ret = -1; if (channel_name == NULL) { - strncpy(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX); + copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX); } else { - strncpy(lsm.u.enable.channel_name, channel_name, NAME_MAX); + copy_string(lsm.u.enable.channel_name, channel_name, NAME_MAX); + } + + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + if (ev == NULL) { + ret = ask_sessiond(LTTNG_KERNEL_ENABLE_ALL_EVENT, NULL); + } else { + memcpy(&lsm.u.enable.event, ev, sizeof(struct lttng_event)); + ret = ask_sessiond(LTTNG_KERNEL_ENABLE_EVENT, NULL); + } + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; } - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - if (ev == NULL) { - ret = ask_sessiond(LTTNG_KERNEL_ENABLE_ALL_EVENT, NULL); - } else { - memcpy(&lsm.u.enable.event, ev, sizeof(struct lttng_event)); - ret = ask_sessiond(LTTNG_KERNEL_ENABLE_EVENT, NULL); - } - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; - return ret; } @@ -390,31 +405,33 @@ int lttng_enable_event(struct lttng_domain *domain, int lttng_disable_event(struct lttng_domain *domain, const char *name, const char *channel_name) { - int ret; + int ret = -1; if (channel_name == NULL) { - strncpy(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX); + copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, NAME_MAX); } else { - strncpy(lsm.u.disable.channel_name, channel_name, NAME_MAX); + copy_string(lsm.u.disable.channel_name, channel_name, NAME_MAX); + } + + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + if (name == NULL) { + ret = ask_sessiond(LTTNG_KERNEL_DISABLE_ALL_EVENT, NULL); + } else { + copy_string(lsm.u.disable.name, name, NAME_MAX); + ret = ask_sessiond(LTTNG_KERNEL_DISABLE_EVENT, NULL); + } + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; } - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - if (name == NULL) { - ret = ask_sessiond(LTTNG_KERNEL_DISABLE_ALL_EVENT, NULL); - } else { - strncpy(lsm.u.disable.name, name, NAME_MAX); - ret = ask_sessiond(LTTNG_KERNEL_DISABLE_EVENT, NULL); - } - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; - return ret; } @@ -424,21 +441,25 @@ int lttng_disable_event(struct lttng_domain *domain, const char *name, int lttng_enable_channel(struct lttng_domain *domain, struct lttng_channel *chan) { - int ret; + int ret = -1; - memcpy(&lsm.u.channel.chan, chan, sizeof(struct lttng_channel)); + if (chan) { + memcpy(&lsm.u.channel.chan, chan, sizeof(struct lttng_channel)); + } - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - ret = ask_sessiond(LTTNG_KERNEL_ENABLE_CHANNEL, NULL); - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + ret = ask_sessiond(LTTNG_KERNEL_ENABLE_CHANNEL, NULL); + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; + } return ret; } @@ -448,21 +469,23 @@ int lttng_enable_channel(struct lttng_domain *domain, */ int lttng_disable_channel(struct lttng_domain *domain, const char *name) { - int ret; + int ret = -1; - strncpy(lsm.u.disable.channel_name, name, NAME_MAX); + copy_string(lsm.u.disable.channel_name, name, NAME_MAX); - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - ret = ask_sessiond(LTTNG_KERNEL_DISABLE_CHANNEL, NULL); - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + ret = ask_sessiond(LTTNG_KERNEL_DISABLE_CHANNEL, NULL); + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; + } return ret; } @@ -476,24 +499,23 @@ int lttng_disable_channel(struct lttng_domain *domain, const char *name) int lttng_list_tracepoints(struct lttng_domain *domain, struct lttng_event **events) { - int ret; + int ret = -1; - ret = copy_lttng_domain(domain); - if (ret < 0) { - return -LTTCOMM_UNKNOWN_DOMAIN; - } + copy_lttng_domain(domain); - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - ret = ask_sessiond(LTTNG_KERNEL_LIST_EVENTS, (void **) events); - break; - case LTTNG_DOMAIN_UST: - ret = LTTCOMM_NOT_IMPLEMENTED; - break; - default: - ret = LTTCOMM_UNKNOWN_DOMAIN; - break; - }; + if (domain) { + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + ret = ask_sessiond(LTTNG_KERNEL_LIST_EVENTS, (void **) events); + break; + case LTTNG_DOMAIN_UST: + ret = LTTCOMM_NOT_IMPLEMENTED; + break; + default: + ret = LTTCOMM_UNKNOWN_DOMAIN; + break; + }; + } return ret / sizeof(struct lttng_event); } @@ -515,8 +537,8 @@ const char *lttng_get_readable_code(int code) */ int lttng_create_session(const char *name, const char *path) { - strncpy(lsm.session_name, name, NAME_MAX); - strncpy(lsm.path, path, PATH_MAX); + copy_string(lsm.session_name, name, NAME_MAX); + copy_string(lsm.path, path, PATH_MAX); return ask_sessiond(LTTNG_CREATE_SESSION, NULL); } @@ -525,7 +547,7 @@ int lttng_create_session(const char *name, const char *path) */ int lttng_destroy_session(const char *name) { - strncpy(lsm.session_name, name, NAME_MAX); + copy_string(lsm.session_name, name, NAME_MAX); return ask_sessiond(LTTNG_DESTROY_SESSION, NULL); } @@ -554,7 +576,7 @@ int lttng_list_domains(const char *session_name, struct lttng_domain **domains) { int ret; - strncpy(lsm.session_name, session_name, NAME_MAX); + copy_string(lsm.session_name, session_name, NAME_MAX); ret = ask_sessiond(LTTNG_LIST_DOMAINS, (void**) domains); if (ret < 0) { return ret; @@ -571,11 +593,8 @@ int lttng_list_channels(struct lttng_domain *domain, { int ret; - strncpy(lsm.session_name, session_name, NAME_MAX); - ret = copy_lttng_domain(domain); - if (ret < 0) { - return -LTTCOMM_UNKNOWN_DOMAIN; - } + copy_string(lsm.session_name, session_name, NAME_MAX); + copy_lttng_domain(domain); ret = ask_sessiond(LTTNG_LIST_CHANNELS, (void**) channels); if (ret < 0) { @@ -594,12 +613,9 @@ int lttng_list_events(struct lttng_domain *domain, { int ret; - strncpy(lsm.session_name, session_name, NAME_MAX); - strncpy(lsm.u.list.channel_name, channel_name, NAME_MAX); - ret = copy_lttng_domain(domain); - if (ret < 0) { - return -LTTCOMM_UNKNOWN_DOMAIN; - } + copy_string(lsm.session_name, session_name, NAME_MAX); + copy_string(lsm.u.list.channel_name, channel_name, NAME_MAX); + copy_lttng_domain(domain); ret = ask_sessiond(LTTNG_LIST_EVENTS, (void**) events); if (ret < 0) { @@ -614,7 +630,7 @@ int lttng_list_events(struct lttng_domain *domain, */ void lttng_set_session_name(const char *name) { - strncpy(lsm.session_name, name, NAME_MAX); + copy_string(lsm.session_name, name, NAME_MAX); } /*