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modprobe: optional "blacklist" command support (by Natanael Copa)

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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
This commit is contained in:
Denis Vlasenko 2008-05-18 14:39:43 +00:00
parent b6c4855f1d
commit 9ddc8d54d1
2 changed files with 38 additions and 5 deletions
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12
modutils/Config.in
View File

@ -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

31
modutils/modprobe.c
View File

@ -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) {