From f2569a133bb64aa951d7af4a93fdb13580a63e56 Mon Sep 17 00:00:00 2001
From: Jessica Yu <jeyu@kernel.org>
Date: Wed, 4 Mar 2020 17:31:30 +0100
Subject: [PATCH] modpost: move the namespace field in Module.symvers last
Patch-mainline: v5.6-rc7
Git-commit: 5190044c2965514a973184ca68ef5fad57a24670
References: jsc#SLE-10158
In order to preserve backwards compatability with kmod tools, we have to
move the namespace field in Module.symvers last, as the depmod -e -E
option looks at the first three fields in Module.symvers to check symbol
versions (and it's expected they stay in the original order of crc,
symbol, module).
In addition, update an ancient comment above read_dump() in modpost that
suggested that the export type field in Module.symvers was optional. I
suspect that there were historical reasons behind that comment that are
no longer accurate. We have been unconditionally printing the export
type since 2.6.18 (commit bd5cbcedf44), which is over a decade ago now.
Fix up read_dump() to treat each field as non-optional. I suspect the
original read_dump() code treated the export field as optional in order
to support pre <= 2.6.18 Module.symvers (which did not have the export
type field). Note that although symbol namespaces are optional, the
field will not be omitted from Module.symvers if a symbol does not have
a namespace. In this case, the field will simply be empty and the next
delimiter or end of line will follow.
Cc: stable@vger.kernel.org
Fixes: cb9b55d21fe0 ("modpost: add support for symbol namespaces")
Tested-by: Matthias Maennich <maennich@google.com>
Reviewed-by: Matthias Maennich <maennich@google.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Jessica Yu <jeyu@suse.de>
---
Documentation/kbuild/modules.rst | 4 ++--
scripts/export_report.pl | 2 +-
scripts/mod/modpost.c | 24 ++++++++++++------------
3 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/Documentation/kbuild/modules.rst b/Documentation/kbuild/modules.rst
index 69fa48ee93d6..e0b45a257f21 100644
--- a/Documentation/kbuild/modules.rst
+++ b/Documentation/kbuild/modules.rst
@@ -470,9 +470,9 @@ build.
The syntax of the Module.symvers file is::
- <CRC> <Symbol> <Namespace> <Module> <Export Type>
+ <CRC> <Symbol> <Module> <Export Type> <Namespace>
- 0xe1cc2a05 usb_stor_suspend USB_STORAGE drivers/usb/storage/usb-storage EXPORT_SYMBOL_GPL
+ 0xe1cc2a05 usb_stor_suspend drivers/usb/storage/usb-storage EXPORT_SYMBOL_GPL USB_STORAGE
The fields are separated by tabs and values may be empty (e.g.
if no namespace is defined for an exported symbol).
diff --git a/scripts/export_report.pl b/scripts/export_report.pl
index 548330e8c4e7..feb3d5542a62 100755
--- a/scripts/export_report.pl
+++ b/scripts/export_report.pl
@@ -94,7 +94,7 @@ if (defined $opt{'o'}) {
#
while ( <$module_symvers> ) {
chomp;
- my (undef, $symbol, $namespace, $module, $gpl) = split('\t');
+ my (undef, $symbol, $module, $gpl, $namespace) = split('\t');
$SYMBOL { $symbol } = [ $module , "0" , $symbol, $gpl];
}
close($module_symvers);
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 7edfdb2f4497..6ab235354f36 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -2427,7 +2427,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
}
/* parse Module.symvers file. line format:
- * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
+ * 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
**/
static void read_dump(const char *fname, unsigned int kernel)
{
@@ -2440,7 +2440,7 @@ static void read_dump(const char *fname, unsigned int kernel)
return;
while ((line = get_next_line(&pos, file, size))) {
- char *symname, *namespace, *modname, *d, *export, *end;
+ char *symname, *namespace, *modname, *d, *export;
unsigned int crc;
struct module *mod;
struct symbol *s;
@@ -2448,16 +2448,16 @@ static void read_dump(const char *fname, unsigned int kernel)
if (!(symname = strchr(line, '\t')))
goto fail;
*symname++ = '\0';
- if (!(namespace = strchr(symname, '\t')))
- goto fail;
- *namespace++ = '\0';
- if (!(modname = strchr(namespace, '\t')))
+ if (!(modname = strchr(symname, '\t')))
goto fail;
*modname++ = '\0';
- if ((export = strchr(modname, '\t')) != NULL)
- *export++ = '\0';
- if (export && ((end = strchr(export, '\t')) != NULL))
- *end = '\0';
+ if (!(export = strchr(modname, '\t')))
+ goto fail;
+ *export++ = '\0';
+ if (!(namespace = strchr(export, '\t')))
+ goto fail;
+ *namespace++ = '\0';
+
crc = strtoul(line, &d, 16);
if (*symname == '\0' || *modname == '\0' || *d != '\0')
goto fail;
@@ -2508,9 +2508,9 @@ static void write_dump(const char *fname)
namespace = symbol->namespace;
buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
symbol->crc, symbol->name,
- namespace ? namespace : "",
symbol->module->name,
- export_str(symbol->export));
+ export_str(symbol->export),
+ namespace ? namespace : "");
}
symbol = symbol->next;
}
--
2.16.4