diff options
Diffstat (limited to 'src/sss_client/nss_mc_passwd.c')
| -rw-r--r-- | src/sss_client/nss_mc_passwd.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/sss_client/nss_mc_passwd.c b/src/sss_client/nss_mc_passwd.c index fa21bd289..4b0876685 100644 --- a/src/sss_client/nss_mc_passwd.c +++ b/src/sss_client/nss_mc_passwd.c @@ -23,6 +23,7 @@ #include <stdio.h> #include <string.h> #include <stdlib.h> +#include <stddef.h> #include <sys/mman.h> #include <time.h> #include "nss_mc.h" @@ -103,12 +104,17 @@ errno_t sss_nss_mc_getpwnam(const char *name, size_t name_len, uint32_t hash; uint32_t slot; int ret; + size_t strs_offset; + uint8_t *max_addr; ret = sss_nss_mc_get_ctx("passwd", &pw_mc_ctx); if (ret) { return ret; } + /* Get max address of data table. */ + max_addr = pw_mc_ctx.data_table + pw_mc_ctx.dt_size; + /* hashes are calculated including the NULL terminator */ hash = sss_nss_mc_hash(&pw_mc_ctx, name, name_len + 1); slot = pw_mc_ctx.hash_table[hash]; @@ -134,7 +140,20 @@ errno_t sss_nss_mc_getpwnam(const char *name, size_t name_len, continue; } + strs_offset = offsetof(struct sss_mc_pwd_data, strs); + data = (struct sss_mc_pwd_data *)rec->data; + /* Integrity check + * - name_len cannot be longer than all strings + * - data->name cannot point outside strings + * - all strings must be within data_table */ + if (name_len > data->strs_len + || (data->name + name_len) > (strs_offset + data->strs_len) + || (uint8_t *)data->strs + data->strs_len > max_addr) { + ret = ENOENT; + goto done; + } + rec_name = (char *)data + data->name; if (strcmp(name, rec_name) == 0) { break; |