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commit 5abded54b
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Author: Stan Cox <scox@redhat.com>
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Date: Fri Jan 28 15:28:27 2022 -0500
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Attempt to access string in userspace if kernel access fails
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Add kernel_or_user_string_quoted(_utf16 _utf32) tapsets to handle
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situations where a kernelspace access was assumed but string is in
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userspace.
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diff --git a/tapset/linux/conversions.stp b/tapset/linux/conversions.stp
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index 82f535f6c..d3d3a0b5a 100644
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--- a/tapset/linux/conversions.stp
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+++ b/tapset/linux/conversions.stp
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@@ -72,6 +72,17 @@ function kernel_string_quoted:string (addr:long)
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(unsigned long)(uintptr_t)STAP_ARG_addr);
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%}
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+/**
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+ * sfunction kernel_or_user_string_quoted - Retrieves and quotes string from kernel or user memory
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+ *
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+ * @addr: the kernel or user memory address to retrieve the string from
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+ *
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+ * Similar to kernel_string_quoted except user memory is a fallback method
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+ */
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+function kernel_or_user_string_quoted:string (addr:long) {
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+ try { return string_quoted(kernel_string(addr)) } catch { return string_quoted(user_string(addr)) }
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+}
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+
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/**
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* sfunction kernel_string_n - Retrieves string of given length from kernel memory
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* @addr: The kernel address to retrieve the string from
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@@ -160,6 +171,16 @@ function kernel_string_quoted_utf32:string (addr:long) {
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try { return string_quoted(kernel_string_utf32(addr)) } catch { return sprintf("0x%x", addr) }
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}
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+/**
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+ * sfunction kernel_or_user_string_quoted_utf32 - Retrieves and quotes UTF-32 string from kernel or user memory
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+ *
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+ * @addr: the kernel or user memory address to retrieve the string from
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+ *
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+ * Similar to kernel_string_quoted_utf32 except user memory is a fallback method
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+ */
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+function kernel_or_user_string_quoted_utf32:string (addr:long) {
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+ try { return string_quoted(kernel_string_utf32(addr)) } catch { return string_quoted(user_string_utf32(addr)) }
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+}
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/**
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* sfunction kernel_string_utf16 - Retrieves UTF-16 string from kernel memory
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@@ -242,6 +263,17 @@ function kernel_string_quoted_utf16:string (addr:long) {
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try { return string_quoted(kernel_string_utf16(addr)) } catch { return sprintf("0x%x", addr) }
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}
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+/**
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+ * sfunction kernel_or_user_string_quoted_utf16 - Retrieves and quotes UTF-16 string from kernel or user memory
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+ *
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+ * @addr: the kernel or user memory address to retrieve the string from
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+ *
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+ * Similar to kernel_string_quoted_utf16 except uses user memory as a fallback method
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+ */
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+function kernel_or_user_string_quoted_utf16:string (addr:long) {
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+ try { return string_quoted(kernel_string_utf16(addr)) } catch { return string_quoted(user_string_utf16(addr)) }
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+}
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+
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/**
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* sfunction kernel_long - Retrieves a long value stored in kernel memory
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diff --git a/tapsets.cxx b/tapsets.cxx
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index 8fc5146e2..8b8f1cad5 100644
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--- a/tapsets.cxx
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+++ b/tapsets.cxx
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@@ -3757,7 +3757,7 @@ dwarf_pretty_print::print_chars (Dwarf_Die* start_type, target_symbol* e,
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return false;
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}
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- string function = userspace_p ? "user_string_quoted" : "kernel_string_quoted";
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+ string function = userspace_p ? "user_string_quoted" : "kernel_or_user_string_quoted";
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Dwarf_Word size = (Dwarf_Word) -1;
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dwarf_formudata (dwarf_attr_integrate (&type, DW_AT_byte_size, &attr), &size);
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switch (size)
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