diff options
Diffstat (limited to 'security/tomoyo/audit.c')
| -rw-r--r-- | security/tomoyo/audit.c | 111 |
1 files changed, 107 insertions, 4 deletions
diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c index b33a20accbef..eefedd9e48e6 100644 --- a/security/tomoyo/audit.c +++ b/security/tomoyo/audit.c @@ -10,6 +10,104 @@ #include <linux/slab.h> /** + * tomoyo_print_bprm - Print "struct linux_binprm" for auditing. + * + * @bprm: Pointer to "struct linux_binprm". + * @dump: Pointer to "struct tomoyo_page_dump". + * + * Returns the contents of @bprm on success, NULL otherwise. + * + * This function uses kzalloc(), so caller must kfree() if this function + * didn't return NULL. + */ +static char *tomoyo_print_bprm(struct linux_binprm *bprm, + struct tomoyo_page_dump *dump) +{ + static const int tomoyo_buffer_len = 4096 * 2; + char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS); + char *cp; + char *last_start; + int len; + unsigned long pos = bprm->p; + int offset = pos % PAGE_SIZE; + int argv_count = bprm->argc; + int envp_count = bprm->envc; + bool truncated = false; + if (!buffer) + return NULL; + len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ "); + cp = buffer + len; + if (!argv_count) { + memmove(cp, "} envp[]={ ", 11); + cp += 11; + } + last_start = cp; + while (argv_count || envp_count) { + if (!tomoyo_dump_page(bprm, pos, dump)) + goto out; + pos += PAGE_SIZE - offset; + /* Read. */ + while (offset < PAGE_SIZE) { + const char *kaddr = dump->data; + const unsigned char c = kaddr[offset++]; + if (cp == last_start) + *cp++ = '"'; + if (cp >= buffer + tomoyo_buffer_len - 32) { + /* Reserve some room for "..." string. */ + truncated = true; + } else if (c == '\\') { + *cp++ = '\\'; + *cp++ = '\\'; + } else if (c > ' ' && c < 127) { + *cp++ = c; + } else if (!c) { + *cp++ = '"'; + *cp++ = ' '; + last_start = cp; + } else { + *cp++ = '\\'; + *cp++ = (c >> 6) + '0'; + *cp++ = ((c >> 3) & 7) + '0'; + *cp++ = (c & 7) + '0'; + } + if (c) + continue; + if (argv_count) { + if (--argv_count == 0) { + if (truncated) { + cp = last_start; + memmove(cp, "... ", 4); + cp += 4; + } + memmove(cp, "} envp[]={ ", 11); + cp += 11; + last_start = cp; + truncated = false; + } + } else if (envp_count) { + if (--envp_count == 0) { + if (truncated) { + cp = last_start; + memmove(cp, "... ", 4); + cp += 4; + } + } + } + if (!argv_count && !envp_count) + break; + } + offset = 0; + } + *cp++ = '}'; + *cp = '\0'; + return buffer; +out: + snprintf(buffer, tomoyo_buffer_len - 1, + "argv[]={ ... } envp[]= { ... }"); + return buffer; +} + +/** * tomoyo_filetype - Get string representation of file type. * * @mode: Mode value for stat(). @@ -139,6 +237,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, va_list args) { char *buf = NULL; + char *bprm_info = NULL; const char *header = NULL; char *realpath = NULL; const char *symlink = NULL; @@ -152,10 +251,11 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, if (r->ee) { struct file *file = r->ee->bprm->file; realpath = tomoyo_realpath_from_path(&file->f_path); - if (!realpath) + bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump); + if (!realpath || !bprm_info) goto out; - /* +80 is for " exec={ realpath=\"%s\" }" */ - len += strlen(realpath) + 80; + /* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */ + len += strlen(realpath) + 80 + strlen(bprm_info); } else if (r->obj && r->obj->symlink_target) { symlink = r->obj->symlink_target->name; /* +18 is for " symlink.target=\"%s\"" */ @@ -168,8 +268,10 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, len--; pos = snprintf(buf, len, "%s", header); if (realpath) { + struct linux_binprm *bprm = r->ee->bprm; pos += snprintf(buf + pos, len - pos, - " exec={ realpath=\"%s\" }", realpath); + " exec={ realpath=\"%s\" argc=%d envc=%d %s }", + realpath, bprm->argc, bprm->envc, bprm_info); } else if (symlink) pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"", symlink); @@ -177,6 +279,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, vsnprintf(buf + pos, len - pos, fmt, args); out: kfree(realpath); + kfree(bprm_info); kfree(header); return buf; } |