The patch titled
Kprobes: print details of kretprobe on assertion failure
has been added to the -mm tree. Its filename is
kprobes-print-details-of-kretprobe-on-assertion-failure.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Kprobes: print details of kretprobe on assertion failure
From: Ananth N Mavinakayanahalli <[EMAIL PROTECTED]>
In certain cases like when the real return address can't be found or when
the number of tracked calls to a kretprobed function is less than the
number of returns, we may not be able to find the correct return address
after processing a kretprobe. Currently we just do a BUG_ON, but no
information is provided about the actual failing kretprobe.
Print out details of the kretprobe before calling BUG().
Signed-off-by: Ananth N Mavinakayanahalli <[EMAIL PROTECTED]>
Cc: Prasanna S Panchamukhi <[EMAIL PROTECTED]>
Cc: Jim Keniston <[EMAIL PROTECTED]>
Cc: Anil S Keshavamurthy <[EMAIL PROTECTED]>
Cc: Maneesh Soni <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/i386/kernel/kprobes.c | 6 +++++-
arch/ia64/kernel/kprobes.c | 7 ++++++-
arch/powerpc/kernel/kprobes.c | 7 ++++++-
arch/x86_64/kernel/kprobes.c | 7 ++++++-
4 files changed, 23 insertions(+), 4 deletions(-)
diff -puN
arch/i386/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
arch/i386/kernel/kprobes.c
---
a/arch/i386/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
+++ a/arch/i386/kernel/kprobes.c
@@ -449,7 +449,11 @@ fastcall void *__kprobes trampoline_hand
break;
}
- BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
+ if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
+ printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
+ ri->rp, ri->rp->kp.addr);
+ BUG();
+ }
spin_unlock_irqrestore(&kretprobe_lock, flags);
diff -puN
arch/ia64/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
arch/ia64/kernel/kprobes.c
---
a/arch/ia64/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
+++ a/arch/ia64/kernel/kprobes.c
@@ -444,7 +444,12 @@ int __kprobes trampoline_probe_handler(s
break;
}
- BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
+ if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
+ printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
+ ri->rp, ri->rp->kp.addr);
+ BUG();
+ }
+
regs->cr_iip = orig_ret_address;
reset_current_kprobe();
diff -puN
arch/powerpc/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
arch/powerpc/kernel/kprobes.c
---
a/arch/powerpc/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
+++ a/arch/powerpc/kernel/kprobes.c
@@ -302,7 +302,12 @@ int __kprobes trampoline_probe_handler(s
break;
}
- BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
+ if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
+ printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
+ ri->rp, ri->rp->kp.addr);
+ BUG();
+ }
+
regs->nip = orig_ret_address;
reset_current_kprobe();
diff -puN
arch/x86_64/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
arch/x86_64/kernel/kprobes.c
---
a/arch/x86_64/kernel/kprobes.c~kprobes-print-details-of-kretprobe-on-assertion-failure
+++ a/arch/x86_64/kernel/kprobes.c
@@ -447,7 +447,12 @@ int __kprobes trampoline_probe_handler(s
break;
}
- BUG_ON(!orig_ret_address || (orig_ret_address == trampoline_address));
+ if (!orig_ret_address || (orig_ret_address == trampoline_address)) {
+ printk("kretprobe BUG!: Processing kretprobe %p @ %p\n",
+ ri->rp, ri->rp->kp.addr);
+ BUG();
+ }
+
regs->rip = orig_ret_address;
reset_current_kprobe();
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
kprobes-make-kprobesymbol_name-const.patch
kprobes-fix-sparse-null-warning.patch
kprobes-print-details-of-kretprobe-on-assertion-failure.patch
kprobes-use-hlist_for_each_entry.patch
kprobes-codingstyle-cleanups.patch
kprobes-kretprobes-simplifcations.patch
-
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