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module: support reading multiple values per modinfo tag 

Similar to modpost's get_next_modinfo(), introduce get_next_modinfo() in
kernel/module.c to acquire any further values associated with the same
modinfo tag name. That is useful for any tags that have multiple
occurrences (such as 'alias'), but is in particular introduced here as
part of the symbol namespaces patch series to read the (potentially)
multiple namespaces a module is importing.

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Martijn Coenen <maco@android.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Matthias Maennich 2019-09-06 11:32:25 +01:00 committed by Jessica Yu
parent 089cf7f6ec
commit c5e4a062fe
1 changed files with 15 additions and 2 deletions
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17
kernel/module.c
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@ -2481,7 +2481,8 @@ static char *next_string(char *string, unsigned long *secsize)
return string;
}
static char *get_modinfo(struct load_info *info, const char *tag)
static char *get_next_modinfo(const struct load_info *info, const char *tag,
char *prev)
{
char *p;
unsigned int taglen = strlen(tag);
@ -2492,13 +2493,25 @@ static char *get_modinfo(struct load_info *info, const char *tag)
* get_modinfo() calls made before rewrite_section_headers()
* must use sh_offset, as sh_addr isn't set!
*/
for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) {
char *modinfo = (char *)info->hdr + infosec->sh_offset;
if (prev) {
size -= prev - modinfo;
modinfo = next_string(prev, &size);
}
for (p = modinfo; p; p = next_string(p, &size)) {
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
return p + taglen + 1;
}
return NULL;
}
static char *get_modinfo(const struct load_info *info, const char *tag)
{
return get_next_modinfo(info, tag, NULL);
}
static void setup_modinfo(struct module *mod, struct load_info *info)
{
struct module_attribute *attr;