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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:37:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 17:37:43 -0700
commit5f56886521d6ddd3648777fae44d82382dd8c87f (patch)
treeaa0db6331cdb01c23f1884439840aadd31bbcca4 /lib
parentf1e9a236e5ddab6c349611ee86f54291916f226c (diff)
parente2a8b0a779787314eca1061308a8182e6c5bfabd (diff)
downloadlinux-linaro-stable-5f56886521d6ddd3648777fae44d82382dd8c87f.tar.gz
Merge branch 'akpm' (incoming from Andrew)
Merge third batch of fixes from Andrew Morton: "Most of the rest. I still have two large patchsets against AIO and IPC, but they're a bit stuck behind other trees and I'm about to vanish for six days. - random fixlets - inotify - more of the MM queue - show_stack() cleanups - DMI update - kthread/workqueue things - compat cleanups - epoll udpates - binfmt updates - nilfs2 - hfs - hfsplus - ptrace - kmod - coredump - kexec - rbtree - pids - pidns - pps - semaphore tweaks - some w1 patches - relay updates - core Kconfig changes - sysrq tweaks" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (109 commits) Documentation/sysrq: fix inconstistent help message of sysrq key ethernet/emac/sysrq: fix inconstistent help message of sysrq key sparc/sysrq: fix inconstistent help message of sysrq key powerpc/xmon/sysrq: fix inconstistent help message of sysrq key ARM/etm/sysrq: fix inconstistent help message of sysrq key power/sysrq: fix inconstistent help message of sysrq key kgdb/sysrq: fix inconstistent help message of sysrq key lib/decompress.c: fix initconst notifier-error-inject: fix module names in Kconfig kernel/sys.c: make prctl(PR_SET_MM) generally available UAPI: remove empty Kbuild files menuconfig: print more info for symbol without prompts init/Kconfig: re-order CONFIG_EXPERT options to fix menuconfig display kconfig menu: move Virtualization drivers near other virtualization options Kconfig: consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS relay: use macro PAGE_ALIGN instead of FIX_SIZE kernel/relay.c: move FIX_SIZE macro into relay.c kernel/relay.c: remove unused function argument actor drivers/w1/slaves/w1_ds2760.c: fix the error handling in w1_ds2760_add_slave() drivers/w1/slaves/w1_ds2781.c: fix the error handling in w1_ds2781_add_slave() ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug25
-rw-r--r--lib/Makefile5
-rw-r--r--lib/decompress.c2
-rw-r--r--lib/dump_stack.c11
-rw-r--r--lib/dynamic_debug.c48
-rw-r--r--lib/rbtree_test.c9
-rw-r--r--lib/string_helpers.c133
-rw-r--r--lib/test-string_helpers.c103
-rw-r--r--lib/usercopy.c9
9 files changed, 291 insertions, 54 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 28be08c09bab..566cf2bc08ea 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1192,7 +1192,7 @@ config MEMORY_NOTIFIER_ERROR_INJECT
bash: echo: write error: Cannot allocate memory
To compile this code as a module, choose M here: the module will
- be called pSeries-reconfig-notifier-error-inject.
+ be called memory-notifier-error-inject.
If unsure, say N.
@@ -1209,7 +1209,7 @@ config OF_RECONFIG_NOTIFIER_ERROR_INJECT
notified, write the error code to "actions/<notifier event>/error".
To compile this code as a module, choose M here: the module will
- be called memory-notifier-error-inject.
+ be called of-reconfig-notifier-error-inject.
If unsure, say N.
@@ -1292,6 +1292,24 @@ config LATENCYTOP
Enable this option if you want to use the LatencyTOP tool
to find out which userspace is blocking on what kernel operations.
+config ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
+ bool
+
+config DEBUG_STRICT_USER_COPY_CHECKS
+ bool "Strict user copy size checks"
+ depends on ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
+ depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING
+ help
+ Enabling this option turns a certain set of sanity checks for user
+ copy operations into compile time failures.
+
+ The copy_from_user() etc checks are there to help test if there
+ are sufficient security checks on the length argument of
+ the copy operation, by having gcc prove that the argument is
+ within bounds.
+
+ If unsure, say N.
+
source mm/Kconfig.debug
source kernel/trace/Kconfig
@@ -1463,5 +1481,8 @@ source "lib/Kconfig.kgdb"
source "lib/Kconfig.kmemcheck"
+config TEST_STRING_HELPERS
+ tristate "Test functions located in the string_helpers module at runtime"
+
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"
diff --git a/lib/Makefile b/lib/Makefile
index 6e2cc561f761..e9c52e1b853a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -15,6 +15,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
earlycpio.o
+obj-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o
lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
@@ -22,8 +23,10 @@ lib-y += kobject.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
- string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
+ gcd.o lcm.o list_sort.o uuid.o flex_array.o \
bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o
+obj-y += string_helpers.o
+obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
obj-y += kstrtox.o
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
diff --git a/lib/decompress.c b/lib/decompress.c
index 31a804277282..f8fdedaf7b3d 100644
--- a/lib/decompress.c
+++ b/lib/decompress.c
@@ -38,7 +38,7 @@ struct compress_format {
decompress_fn decompressor;
};
-static const struct compress_format compressed_formats[] __initdata = {
+static const struct compress_format compressed_formats[] __initconst = {
{ {037, 0213}, "gzip", gunzip },
{ {037, 0236}, "gzip", gunzip },
{ {0x42, 0x5a}, "bzip2", bunzip2 },
diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 42f4f55c9458..53bad099ebd6 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -5,11 +5,16 @@
#include <linux/kernel.h>
#include <linux/export.h>
+#include <linux/sched.h>
+/**
+ * dump_stack - dump the current task information and its stack trace
+ *
+ * Architectures can override this implementation by implementing its own.
+ */
void dump_stack(void)
{
- printk(KERN_NOTICE
- "This architecture does not implement dump_stack()\n");
+ dump_stack_print_info(KERN_DEFAULT);
+ show_stack(NULL, NULL);
}
-
EXPORT_SYMBOL(dump_stack);
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 46032453abd5..99fec3ae405a 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -24,6 +24,7 @@
#include <linux/sysctl.h>
#include <linux/ctype.h>
#include <linux/string.h>
+#include <linux/string_helpers.h>
#include <linux/uaccess.h>
#include <linux/dynamic_debug.h>
#include <linux/debugfs.h>
@@ -276,47 +277,6 @@ static inline int parse_lineno(const char *str, unsigned int *val)
return 0;
}
-/*
- * Undo octal escaping in a string, inplace. This is useful to
- * allow the user to express a query which matches a format
- * containing embedded spaces.
- */
-static char *unescape(char *str)
-{
- char *in = str;
- char *out = str;
-
- while (*in) {
- if (*in == '\\') {
- if (in[1] == '\\') {
- *out++ = '\\';
- in += 2;
- continue;
- } else if (in[1] == 't') {
- *out++ = '\t';
- in += 2;
- continue;
- } else if (in[1] == 'n') {
- *out++ = '\n';
- in += 2;
- continue;
- } else if (isodigit(in[1]) &&
- isodigit(in[2]) &&
- isodigit(in[3])) {
- *out++ = (((in[1] - '0') << 6) |
- ((in[2] - '0') << 3) |
- (in[3] - '0'));
- in += 4;
- continue;
- }
- }
- *out++ = *in++;
- }
- *out = '\0';
-
- return str;
-}
-
static int check_set(const char **dest, char *src, char *name)
{
int rc = 0;
@@ -370,8 +330,10 @@ static int ddebug_parse_query(char *words[], int nwords,
} else if (!strcmp(words[i], "module")) {
rc = check_set(&query->module, words[i+1], "module");
} else if (!strcmp(words[i], "format")) {
- rc = check_set(&query->format, unescape(words[i+1]),
- "format");
+ string_unescape_inplace(words[i+1], UNESCAPE_SPACE |
+ UNESCAPE_OCTAL |
+ UNESCAPE_SPECIAL);
+ rc = check_set(&query->format, words[i+1], "format");
} else if (!strcmp(words[i], "line")) {
char *first = words[i+1];
char *last = strchr(first, '-');
diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
index af38aedbd874..122f02f9941b 100644
--- a/lib/rbtree_test.c
+++ b/lib/rbtree_test.c
@@ -117,8 +117,7 @@ static int black_path_count(struct rb_node *rb)
static void check(int nr_nodes)
{
struct rb_node *rb;
- int count = 0;
- int blacks = 0;
+ int count = 0, blacks = 0;
u32 prev_key = 0;
for (rb = rb_first(&root); rb; rb = rb_next(rb)) {
@@ -134,7 +133,9 @@ static void check(int nr_nodes)
prev_key = node->key;
count++;
}
+
WARN_ON_ONCE(count != nr_nodes);
+ WARN_ON_ONCE(count < (1 << black_path_count(rb_last(&root))) - 1);
}
static void check_augmented(int nr_nodes)
@@ -148,7 +149,7 @@ static void check_augmented(int nr_nodes)
}
}
-static int rbtree_test_init(void)
+static int __init rbtree_test_init(void)
{
int i, j;
cycles_t time1, time2, time;
@@ -221,7 +222,7 @@ static int rbtree_test_init(void)
return -EAGAIN; /* Fail will directly unload the module */
}
-static void rbtree_test_exit(void)
+static void __exit rbtree_test_exit(void)
{
printk(KERN_ALERT "test exit\n");
}
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 1cffc223bff5..ed5c1454dd62 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -2,10 +2,12 @@
* Helpers for formatting and printing strings
*
* Copyright 31 August 2008 James Bottomley
+ * Copyright (C) 2013, Intel Corporation
*/
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/export.h>
+#include <linux/ctype.h>
#include <linux/string_helpers.h>
/**
@@ -66,3 +68,134 @@ int string_get_size(u64 size, const enum string_size_units units,
return 0;
}
EXPORT_SYMBOL(string_get_size);
+
+static bool unescape_space(char **src, char **dst)
+{
+ char *p = *dst, *q = *src;
+
+ switch (*q) {
+ case 'n':
+ *p = '\n';
+ break;
+ case 'r':
+ *p = '\r';
+ break;
+ case 't':
+ *p = '\t';
+ break;
+ case 'v':
+ *p = '\v';
+ break;
+ case 'f':
+ *p = '\f';
+ break;
+ default:
+ return false;
+ }
+ *dst += 1;
+ *src += 1;
+ return true;
+}
+
+static bool unescape_octal(char **src, char **dst)
+{
+ char *p = *dst, *q = *src;
+ u8 num;
+
+ if (isodigit(*q) == 0)
+ return false;
+
+ num = (*q++) & 7;
+ while (num < 32 && isodigit(*q) && (q - *src < 3)) {
+ num <<= 3;
+ num += (*q++) & 7;
+ }
+ *p = num;
+ *dst += 1;
+ *src = q;
+ return true;
+}
+
+static bool unescape_hex(char **src, char **dst)
+{
+ char *p = *dst, *q = *src;
+ int digit;
+ u8 num;
+
+ if (*q++ != 'x')
+ return false;
+
+ num = digit = hex_to_bin(*q++);
+ if (digit < 0)
+ return false;
+
+ digit = hex_to_bin(*q);
+ if (digit >= 0) {
+ q++;
+ num = (num << 4) | digit;
+ }
+ *p = num;
+ *dst += 1;
+ *src = q;
+ return true;
+}
+
+static bool unescape_special(char **src, char **dst)
+{
+ char *p = *dst, *q = *src;
+
+ switch (*q) {
+ case '\"':
+ *p = '\"';
+ break;
+ case '\\':
+ *p = '\\';
+ break;
+ case 'a':
+ *p = '\a';
+ break;
+ case 'e':
+ *p = '\e';
+ break;
+ default:
+ return false;
+ }
+ *dst += 1;
+ *src += 1;
+ return true;
+}
+
+int string_unescape(char *src, char *dst, size_t size, unsigned int flags)
+{
+ char *out = dst;
+
+ while (*src && --size) {
+ if (src[0] == '\\' && src[1] != '\0' && size > 1) {
+ src++;
+ size--;
+
+ if (flags & UNESCAPE_SPACE &&
+ unescape_space(&src, &out))
+ continue;
+
+ if (flags & UNESCAPE_OCTAL &&
+ unescape_octal(&src, &out))
+ continue;
+
+ if (flags & UNESCAPE_HEX &&
+ unescape_hex(&src, &out))
+ continue;
+
+ if (flags & UNESCAPE_SPECIAL &&
+ unescape_special(&src, &out))
+ continue;
+
+ *out++ = '\\';
+ }
+ *out++ = *src++;
+ }
+ *out = '\0';
+
+ return out - dst;
+}
+EXPORT_SYMBOL(string_unescape);
diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
new file mode 100644
index 000000000000..6ac48de04c0e
--- /dev/null
+++ b/lib/test-string_helpers.c
@@ -0,0 +1,103 @@
+/*
+ * Test cases for lib/string_helpers.c module.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/string.h>
+#include <linux/string_helpers.h>
+
+struct test_string {
+ const char *in;
+ const char *out;
+ unsigned int flags;
+};
+
+static const struct test_string strings[] __initconst = {
+ {
+ .in = "\\f\\ \\n\\r\\t\\v",
+ .out = "\f\\ \n\r\t\v",
+ .flags = UNESCAPE_SPACE,
+ },
+ {
+ .in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",
+ .out = " \001\00387\0064\005 \\8aH?7",
+ .flags = UNESCAPE_OCTAL,
+ },
+ {
+ .in = "\\xv\\xa\\x2c\\xD\\x6f2",
+ .out = "\\xv\n,\ro2",
+ .flags = UNESCAPE_HEX,
+ },
+ {
+ .in = "\\h\\\\\\\"\\a\\e\\",
+ .out = "\\h\\\"\a\e\\",
+ .flags = UNESCAPE_SPECIAL,
+ },
+};
+
+static void __init test_string_unescape(unsigned int flags, bool inplace)
+{
+ char in[256];
+ char out_test[256];
+ char out_real[256];
+ int i, p = 0, q_test = 0, q_real = sizeof(out_real);
+
+ for (i = 0; i < ARRAY_SIZE(strings); i++) {
+ const char *s = strings[i].in;
+ int len = strlen(strings[i].in);
+
+ /* Copy string to in buffer */
+ memcpy(&in[p], s, len);
+ p += len;
+
+ /* Copy expected result for given flags */
+ if (flags & strings[i].flags) {
+ s = strings[i].out;
+ len = strlen(strings[i].out);
+ }
+ memcpy(&out_test[q_test], s, len);
+ q_test += len;
+ }
+ in[p++] = '\0';
+
+ /* Call string_unescape and compare result */
+ if (inplace) {
+ memcpy(out_real, in, p);
+ if (flags == UNESCAPE_ANY)
+ q_real = string_unescape_any_inplace(out_real);
+ else
+ q_real = string_unescape_inplace(out_real, flags);
+ } else if (flags == UNESCAPE_ANY) {
+ q_real = string_unescape_any(in, out_real, q_real);
+ } else {
+ q_real = string_unescape(in, out_real, q_real, flags);
+ }
+
+ if (q_real != q_test || memcmp(out_test, out_real, q_test)) {
+ pr_warn("Test failed: flags = %u\n", flags);
+ print_hex_dump(KERN_WARNING, "Input: ",
+ DUMP_PREFIX_NONE, 16, 1, in, p - 1, true);
+ print_hex_dump(KERN_WARNING, "Expected: ",
+ DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true);
+ print_hex_dump(KERN_WARNING, "Got: ",
+ DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true);
+ }
+}
+
+static int __init test_string_helpers_init(void)
+{
+ unsigned int i;
+
+ pr_info("Running tests...\n");
+ for (i = 0; i < UNESCAPE_ANY + 1; i++)
+ test_string_unescape(i, false);
+ test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true);
+
+ return -EINVAL;
+}
+module_init(test_string_helpers_init);
+MODULE_LICENSE("Dual BSD/GPL");
diff --git a/lib/usercopy.c b/lib/usercopy.c
new file mode 100644
index 000000000000..4f5b1ddbcd25
--- /dev/null
+++ b/lib/usercopy.c
@@ -0,0 +1,9 @@
+#include <linux/export.h>
+#include <linux/bug.h>
+#include <linux/uaccess.h>
+
+void copy_from_user_overflow(void)
+{
+ WARN(1, "Buffer overflow detected!\n");
+}
+EXPORT_SYMBOL(copy_from_user_overflow);