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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-05 10:58:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-05 10:58:06 -0700
commitf8ce1faf55955de62e0a12e330c6d9a526071f65 (patch)
treea3b0ddd3f37e40d3ed0fd2cd433a2723403c8b97 /kernel
parent24d0c2542b38963ae4d5171ecc0a2c1326c656bc (diff)
parenta53a11f35762ff1d5e268adedf2ab9ce313f871d (diff)
downloadlinux-linaro-stable-f8ce1faf55955de62e0a12e330c6d9a526071f65.tar.gz
Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
Pull mudule updates from Rusty Russell: "We get rid of the general module prefix confusion with a binary config option, fix a remove/insert race which Never Happens, and (my favorite) handle the case when we have too many modules for a single commandline. Seriously, the kernel is full, please go away!" * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: modpost: fix unwanted VMLINUX_SYMBOL_STR expansion X.509: Support parse long form of length octets in Authority Key Identifier module: don't unlink the module until we've removed all exposure. kernel: kallsyms: memory override issue, need check destination buffer length MODSIGN: do not send garbage to stderr when enabling modules signature modpost: handle huge numbers of modules. modpost: add -T option to read module names from file/stdin. modpost: minor cleanup. genksyms: pass symbol-prefix instead of arch module: fix symbol versioning with symbol prefixes CONFIG_SYMBOL_PREFIX: cleanup.
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Makefile2
-rw-r--r--kernel/kallsyms.c26
-rw-r--r--kernel/modsign_certificate.S13
-rw-r--r--kernel/module.c18
4 files changed, 34 insertions, 25 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index d1574d47cf27..271fd3119af9 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -176,7 +176,7 @@ signing_key.priv signing_key.x509: x509.genkey
openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \
-batch -x509 -config x509.genkey \
-outform DER -out signing_key.x509 \
- -keyout signing_key.priv
+ -keyout signing_key.priv 2>&1
@echo "###"
@echo "### Key pair generated."
@echo "###"
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 2169feeba529..3127ad52cdb2 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -84,9 +84,11 @@ static int is_ksym_addr(unsigned long addr)
/*
* Expand a compressed symbol data into the resulting uncompressed string,
+ * if uncompressed string is too long (>= maxlen), it will be truncated,
* given the offset to where the symbol is in the compressed stream.
*/
-static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
+static unsigned int kallsyms_expand_symbol(unsigned int off,
+ char *result, size_t maxlen)
{
int len, skipped_first = 0;
const u8 *tptr, *data;
@@ -113,15 +115,20 @@ static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
while (*tptr) {
if (skipped_first) {
+ if (maxlen <= 1)
+ goto tail;
*result = *tptr;
result++;
+ maxlen--;
} else
skipped_first = 1;
tptr++;
}
}
- *result = '\0';
+tail:
+ if (maxlen)
+ *result = '\0';
/* Return to offset to the next symbol. */
return off;
@@ -176,7 +183,7 @@ unsigned long kallsyms_lookup_name(const char *name)
unsigned int off;
for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
- off = kallsyms_expand_symbol(off, namebuf);
+ off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
if (strcmp(namebuf, name) == 0)
return kallsyms_addresses[i];
@@ -195,7 +202,7 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
int ret;
for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
- off = kallsyms_expand_symbol(off, namebuf);
+ off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));
ret = fn(data, namebuf, NULL, kallsyms_addresses[i]);
if (ret != 0)
return ret;
@@ -294,7 +301,8 @@ const char *kallsyms_lookup(unsigned long addr,
pos = get_symbol_pos(addr, symbolsize, offset);
/* Grab name */
- kallsyms_expand_symbol(get_symbol_offset(pos), namebuf);
+ kallsyms_expand_symbol(get_symbol_offset(pos),
+ namebuf, KSYM_NAME_LEN);
if (modname)
*modname = NULL;
return namebuf;
@@ -315,7 +323,8 @@ int lookup_symbol_name(unsigned long addr, char *symname)
pos = get_symbol_pos(addr, NULL, NULL);
/* Grab name */
- kallsyms_expand_symbol(get_symbol_offset(pos), symname);
+ kallsyms_expand_symbol(get_symbol_offset(pos),
+ symname, KSYM_NAME_LEN);
return 0;
}
/* See if it's in a module. */
@@ -333,7 +342,8 @@ int lookup_symbol_attrs(unsigned long addr, unsigned long *size,
pos = get_symbol_pos(addr, size, offset);
/* Grab name */
- kallsyms_expand_symbol(get_symbol_offset(pos), name);
+ kallsyms_expand_symbol(get_symbol_offset(pos),
+ name, KSYM_NAME_LEN);
modname[0] = '\0';
return 0;
}
@@ -463,7 +473,7 @@ static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
iter->type = kallsyms_get_symbol_type(off);
- off = kallsyms_expand_symbol(off, iter->name);
+ off = kallsyms_expand_symbol(off, iter->name, ARRAY_SIZE(iter->name));
return off - iter->nameoff;
}
diff --git a/kernel/modsign_certificate.S b/kernel/modsign_certificate.S
index 246b4c6e6135..4a9a86d12c8b 100644
--- a/kernel/modsign_certificate.S
+++ b/kernel/modsign_certificate.S
@@ -1,15 +1,8 @@
-/* SYMBOL_PREFIX defined on commandline from CONFIG_SYMBOL_PREFIX */
-#ifndef SYMBOL_PREFIX
-#define ASM_SYMBOL(sym) sym
-#else
-#define PASTE2(x,y) x##y
-#define PASTE(x,y) PASTE2(x,y)
-#define ASM_SYMBOL(sym) PASTE(SYMBOL_PREFIX, sym)
-#endif
+#include <linux/export.h>
#define GLOBAL(name) \
- .globl ASM_SYMBOL(name); \
- ASM_SYMBOL(name):
+ .globl VMLINUX_SYMBOL(name); \
+ VMLINUX_SYMBOL(name):
.section ".init.data","aw"
diff --git a/kernel/module.c b/kernel/module.c
index 0925c9a71975..b049939177f6 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1209,10 +1209,11 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
/* Since this should be found in kernel (which can't be removed),
* no locking is necessary. */
- if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
+ if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
&crc, true, false))
BUG();
- return check_version(sechdrs, versindex, "module_layout", mod, crc,
+ return check_version(sechdrs, versindex,
+ VMLINUX_SYMBOL_STR(module_layout), mod, crc,
NULL);
}
@@ -1861,12 +1862,12 @@ static void free_module(struct module *mod)
{
trace_module_free(mod);
- /* Delete from various lists */
- mutex_lock(&module_mutex);
- stop_machine(__unlink_module, mod, NULL);
- mutex_unlock(&module_mutex);
mod_sysfs_teardown(mod);
+ /* We leave it in list to prevent duplicate loads, but make sure
+ * that noone uses it while it's being deconstructed. */
+ mod->state = MODULE_STATE_UNFORMED;
+
/* Remove dynamic debug info */
ddebug_remove_module(mod->name);
@@ -1879,6 +1880,11 @@ static void free_module(struct module *mod)
/* Free any allocated parameters. */
destroy_params(mod->kp, mod->num_kp);
+ /* Now we can delete it from the lists */
+ mutex_lock(&module_mutex);
+ stop_machine(__unlink_module, mod, NULL);
+ mutex_unlock(&module_mutex);
+
/* This may be NULL, but that's OK */
unset_module_init_ro_nx(mod);
module_free(mod, mod->module_init);