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authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2006-10-02 02:17:30 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-02 07:57:16 -0700
commit3a872d89baae821a0f6e2c1055d4b47650661137 (patch)
tree5ac6aa55e04960e02f25ff5079078f975957b1b3 /kernel
parent782237a2418e2561a87c86a4832726931adce737 (diff)
[PATCH] Kprobes: Make kprobe modules more portable
In an effort to make kprobe modules more portable, here is a patch that: o Introduces the "symbol_name" field to struct kprobe. The symbol->address resolution now happens in the kernel in an architecture agnostic manner. 64-bit powerpc users no longer have to specify the ".symbols" o Introduces the "offset" field to struct kprobe to allow a user to specify an offset into a symbol. o The legacy mechanism of specifying the kprobe.addr is still supported. However, if both the kprobe.addr and kprobe.symbol_name are specified, probe registration fails with an -EINVAL. o The symbol resolution code uses kallsyms_lookup_name(). So CONFIG_KPROBES now depends on CONFIG_KALLSYMS o Apparantly kprobe modules were the only legitimate out-of-tree user of the kallsyms_lookup_name() EXPORT. Now that the symbol resolution happens in-kernel, remove the EXPORT as suggested by Christoph Hellwig o Modify tcp_probe.c that uses the kprobe interface so as to make it work on multiple platforms (in its earlier form, the code wouldn't work, say, on powerpc) Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kallsyms.c1
-rw-r--r--kernel/kprobes.c26
2 files changed, 26 insertions, 1 deletions
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index ab16a5a4cfe9..342bca62c496 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -154,7 +154,6 @@ unsigned long kallsyms_lookup_name(const char *name)
}
return module_kallsyms_lookup_name(name);
}
-EXPORT_SYMBOL_GPL(kallsyms_lookup_name);
/*
* Lookup an address
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 3f57dfdc8f92..f66b8e681b4d 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -37,6 +37,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/moduleloader.h>
+#include <linux/kallsyms.h>
#include <asm-generic/sections.h>
#include <asm/cacheflush.h>
#include <asm/errno.h>
@@ -45,6 +46,16 @@
#define KPROBE_HASH_BITS 6
#define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
+
+/*
+ * Some oddball architectures like 64bit powerpc have function descriptors
+ * so this must be overridable.
+ */
+#ifndef kprobe_lookup_name
+#define kprobe_lookup_name(name, addr) \
+ addr = ((kprobe_opcode_t *)(kallsyms_lookup_name(name)))
+#endif
+
static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
static atomic_t kprobe_count;
@@ -447,6 +458,21 @@ static int __kprobes __register_kprobe(struct kprobe *p,
struct kprobe *old_p;
struct module *probed_mod;
+ /*
+ * If we have a symbol_name argument look it up,
+ * and add it to the address. That way the addr
+ * field can either be global or relative to a symbol.
+ */
+ if (p->symbol_name) {
+ if (p->addr)
+ return -EINVAL;
+ kprobe_lookup_name(p->symbol_name, p->addr);
+ }
+
+ if (!p->addr)
+ return -EINVAL;
+ p->addr = (kprobe_opcode_t *)(((char *)p->addr)+ p->offset);
+
if ((!kernel_text_address((unsigned long) p->addr)) ||
in_kprobes_functions((unsigned long) p->addr))
return -EINVAL;

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