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[PATCH] /sys/modules: allow full length section names

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I've been using systemtap for some debugging and I noticed that it can't
probe a lot of modules.  Turns out it's kind of silly, the sections section
of /sys/module is limited to 32byte filenames and many of the actual
sections are a a bit longer than that.

[akpm@osdl.org: rewrite to use dymanic allocation]
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ian S. Nelson 2006-09-29 02:01:31 -07:00 committed by Linus Torvalds
parent 3b5e0cbb4f
commit 04b1db9fd7
3 changed files with 24 additions and 9 deletions
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3
CREDITS
View file

@ -2478,7 +2478,8 @@ S: Derbyshire DE4 3RL
S: United Kingdom S: United Kingdom
N: Ian S. Nelson N: Ian S. Nelson
E: ian.nelson@echostar.com E: nelsonis@earthlink.net
P: 1024D/00D3D983 3EFD 7B86 B888 D7E2 29B6 9E97 576F 1B97 00D3 D983
D: Minor mmap and ide hacks D: Minor mmap and ide hacks
S: 1370 Atlantis Ave. S: 1370 Atlantis Ave.
S: Lafayette CO, 80026 S: Lafayette CO, 80026

4
include/linux/module.h
View file

@ -232,17 +232,17 @@ enum module_state
}; };
/* Similar stuff for section attributes. */ /* Similar stuff for section attributes. */
#define MODULE_SECT_NAME_LEN 32
struct module_sect_attr struct module_sect_attr
{ {
struct module_attribute mattr; struct module_attribute mattr;
char name[MODULE_SECT_NAME_LEN]; char *name;
unsigned long address; unsigned long address;
}; };
struct module_sect_attrs struct module_sect_attrs
{ {
struct attribute_group grp; struct attribute_group grp;
int nsections;
struct module_sect_attr attrs[0]; struct module_sect_attr attrs[0];
}; };

26
kernel/module.c
View file

@ -933,6 +933,15 @@ static ssize_t module_sect_show(struct module_attribute *mattr,
return sprintf(buf, "0x%lx\n", sattr->address); return sprintf(buf, "0x%lx\n", sattr->address);
} }
static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
{
int section;
for (section = 0; section < sect_attrs->nsections; section++)
kfree(sect_attrs->attrs[section].name);
kfree(sect_attrs);
}
static void add_sect_attrs(struct module *mod, unsigned int nsect, static void add_sect_attrs(struct module *mod, unsigned int nsect,
char *secstrings, Elf_Shdr *sechdrs) char *secstrings, Elf_Shdr *sechdrs)
{ {
@ -949,21 +958,26 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
+ nloaded * sizeof(sect_attrs->attrs[0]), + nloaded * sizeof(sect_attrs->attrs[0]),
sizeof(sect_attrs->grp.attrs[0])); sizeof(sect_attrs->grp.attrs[0]));
size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
if (sect_attrs == NULL)
return; return;
/* Setup section attributes. */ /* Setup section attributes. */
sect_attrs->grp.name = "sections"; sect_attrs->grp.name = "sections";
sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
sect_attrs->nsections = 0;
sattr = &sect_attrs->attrs[0]; sattr = &sect_attrs->attrs[0];
gattr = &sect_attrs->grp.attrs[0]; gattr = &sect_attrs->grp.attrs[0];
for (i = 0; i < nsect; i++) { for (i = 0; i < nsect; i++) {
if (! (sechdrs[i].sh_flags & SHF_ALLOC)) if (! (sechdrs[i].sh_flags & SHF_ALLOC))
continue; continue;
sattr->address = sechdrs[i].sh_addr; sattr->address = sechdrs[i].sh_addr;
strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
MODULE_SECT_NAME_LEN); GFP_KERNEL);
if (sattr->name == NULL)
goto out;
sect_attrs->nsections++;
sattr->mattr.show = module_sect_show; sattr->mattr.show = module_sect_show;
sattr->mattr.store = NULL; sattr->mattr.store = NULL;
sattr->mattr.attr.name = sattr->name; sattr->mattr.attr.name = sattr->name;
@ -979,7 +993,7 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
mod->sect_attrs = sect_attrs; mod->sect_attrs = sect_attrs;
return; return;
out: out:
kfree(sect_attrs); free_sect_attrs(sect_attrs);
} }
static void remove_sect_attrs(struct module *mod) static void remove_sect_attrs(struct module *mod)
@ -989,13 +1003,13 @@ static void remove_sect_attrs(struct module *mod)
&mod->sect_attrs->grp); &mod->sect_attrs->grp);
/* We are positive that no one is using any sect attrs /* We are positive that no one is using any sect attrs
* at this point. Deallocate immediately. */ * at this point. Deallocate immediately. */
kfree(mod->sect_attrs); free_sect_attrs(mod->sect_attrs);
mod->sect_attrs = NULL; mod->sect_attrs = NULL;
} }
} }
#else #else
static inline void add_sect_attrs(struct module *mod, unsigned int nsect, static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
char *sectstrings, Elf_Shdr *sechdrs) char *sectstrings, Elf_Shdr *sechdrs)
{ {