Fix for the display of kernel module symbol types by the "sym"

command in Linux 5.0 and later kernels if the module debuginfo
data has not been loaded into the crash session.  The st_info member
of the Elf32_Sym or Elf64_Sym structures has changed so as to not
contain ASCII symbol type characters, and as a result the "sym"
command will show unprintable data as the symbol type.  With the
patch, only text types ("t" or "T") will be displayed, and the
symbols others will show "?".
([email protected])

symbols.c

@@ -2188,7 +2188,14 @@ Elf32_Sym_to_common(Elf32_Sym *e32, struct elf_common *ec)
 	ec->st_name = (ulong)e32->st_name;
 	ec->st_value = (ulong)e32->st_value;
 	ec->st_shndx = (ulong)e32->st_shndx;
-	ec->st_info = e32->st_info;
+	if ((e32->st_info >= ' ') && (e32->st_info < 0x7f))
+		ec->st_info = e32->st_info;
+	else if (e32->st_info == 0x02)
+		ec->st_info = 't';
+	else if (e32->st_info == 0x12)
+		ec->st_info = 'T';
+	else
+		ec->st_info = '?';
 	ec->st_size = (ulong)e32->st_size;
 }
 
@@ -2198,7 +2205,14 @@ Elf64_Sym_to_common(Elf64_Sym *e64, struct elf_common *ec)
 	ec->st_name = (ulong)e64->st_name;
 	ec->st_value = (ulong)e64->st_value;
 	ec->st_shndx = (ulong)e64->st_shndx;
-	ec->st_info = e64->st_info;
+	if ((e64->st_info >= ' ') && (e64->st_info < 0x7f))
+		ec->st_info = e64->st_info;
+	else if (e64->st_info == 0x02)
+		ec->st_info = 't';
+	else if (e64->st_info == 0x12)
+		ec->st_info = 'T';
+	else
+		ec->st_info = '?';
 	ec->st_size = (ulong)e64->st_size;
 }