From 9ddc8d54d18f33774dc9db80a26f82bbaff5747d Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Sun, 18 May 2008 14:39:43 +0000 Subject: modprobe: optional "blacklist" command support (by Natanael Copa) is_conf_command - 56 +56 include_conf 898 917 +19 check_dep 348 356 +8 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/0 up/down: 83/0) Total: 83 bytes --- modutils/Config.in | 12 ++++++++++++ modutils/modprobe.c | 31 ++++++++++++++++++++++++++----- 2 files changed, 38 insertions(+), 5 deletions(-) (limited to 'modutils') diff --git a/modutils/Config.in b/modutils/Config.in index b2ef51a05..c5e596d1d 100644 --- a/modutils/Config.in +++ b/modutils/Config.in @@ -117,6 +117,18 @@ config FEATURE_MODPROBE_FANCY_ALIAS mismatch between module name and file name, along with bus-specific aliases (such as pci:... or usb:... aliases). +config FEATURE_MODPROBE_BLACKLIST + bool + prompt "Blacklist support" + default n + depends on MODPROBE && FEATURE_2_6_MODULES + help + Say 'y' here to enable support for the 'blacklist' command in + modprobe.conf. This prevents the alias resolver to resolve + blacklisted modules. This is useful if you want to prevent your + hardware autodetection scripts to load modules like evdev, frame + buffer drivers etc. + comment "Options common to multiple modutils" depends on INSMOD || RMMOD || MODPROBE || LSMOD diff --git a/modutils/modprobe.c b/modutils/modprobe.c index f6681a8d8..60dc92665 100644 --- a/modutils/modprobe.c +++ b/modutils/modprobe.c @@ -29,7 +29,8 @@ struct dep_t { /* one-way list of dependency rules */ struct mod_opt_t * m_options; /* the module options */ int m_isalias : 1; /* the module is an alias */ - int m_reserved : 15; /* stuffin' */ + int m_isblacklisted : 1; + int m_reserved : 14; /* stuffin' */ int m_depcnt : 16; /* the number of dependable module(s) */ char ** m_deparr; /* the list of dependable module(s) */ @@ -230,6 +231,13 @@ static char *parse_command_string(char *src, char **dst) #define parse_command_string(src, dst) (0) #endif /* ENABLE_FEATURE_MODPROBE_MULTIPLE_OPTIONS */ +static int is_conf_command(char *buffer, const char *command) +{ + int len = strlen(command); + return ((strstr(buffer, command) == buffer) && + isspace(buffer[len])); +} + /* * This function reads aliases and default module options from a configuration file * (/etc/modprobe.conf syntax). It supports includes (only files, no directories). @@ -260,7 +268,7 @@ static void include_conf(struct dep_t **first, struct dep_t **current, char *buf if (continuation_line) continue; - if ((strncmp(buffer, "alias", 5) == 0) && isspace(buffer[5])) { + if (is_conf_command(buffer, "alias")) { char *alias, *mod; if (parse_tag_value(buffer + 6, &alias, &mod)) { @@ -284,7 +292,7 @@ static void include_conf(struct dep_t **first, struct dep_t **current, char *buf } /*(*current)->m_next = NULL; - done by xzalloc */ } - } else if ((strncmp(buffer, "options", 7) == 0) && isspace(buffer[7])) { + } else if (is_conf_command(buffer, "options")) { char *mod, *opt; /* split the line in the module/alias name, and options */ @@ -307,7 +315,7 @@ static void include_conf(struct dep_t **first, struct dep_t **current, char *buf } } } - } else if ((strncmp(buffer, "include", 7) == 0) && isspace(buffer[7])) { + } else if (is_conf_command(buffer, "include")) { int fdi; char *filename; @@ -317,6 +325,18 @@ static void include_conf(struct dep_t **first, struct dep_t **current, char *buf include_conf(first, current, buffer, buflen, fdi); close(fdi); } + } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST && + (is_conf_command(buffer, "blacklist"))) { + char *mod; + struct dep_t *dt; + + mod = skip_whitespace(buffer + 10); + for (dt = *first; dt; dt = dt->m_next) { + if (dt->m_isalias && strcmp(dt->m_deparr[0], mod) == 0) + break; + } + if (dt) + dt->m_isblacklisted = 1; } } /* while (reads(...)) */ } @@ -728,7 +748,8 @@ static void check_dep(char *mod, struct mod_list_t **head, struct mod_list_t **t // resolve alias names while (dt->m_isalias) { - if (dt->m_depcnt == 1) { + if (dt->m_depcnt == 1 && !(ENABLE_FEATURE_MODPROBE_BLACKLIST && + dt->m_isblacklisted)) { struct dep_t *adt; for (adt = depend; adt; adt = adt->m_next) { -- cgit v1.2.3