[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20190410195708.162185-1-joel@joelfernandes.org>
Date: Wed, 10 Apr 2019 15:57:06 -0400
From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
To: linux-kernel@...r.kernel.org
Cc: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
paulmck@...ux.vnet.ibm.com,
rostedt@...dmis.org,
mathieu.desnoyers@...icios.com,
rcu@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
kernel-team@...roid.com,
keescook@...omium.org,
Jessica Yu <jeyu@...nel.org>
Subject: [PATCH v3 1/3] module: Prepare for addition of new ro_after_init sections
For the purposes of hardening modules by adding sections to
ro_after_init sections, prepare for addition of new ro_after_init
entries which we do in future patches. Create a table to which new
entries could be added later. This makes it less error prone and reduce
code duplication.
Cc: paulmck@...ux.vnet.ibm.com
Cc: rostedt@...dmis.org
Cc: mathieu.desnoyers@...icios.com
Cc: rcu@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com
Cc: kernel-team@...roid.com
Suggested-by: keescook@...omium.org
Reviewed-by: keescook@...omium.org
Acked-by: rostedt@...dmis.org
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
kernel/module.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)
diff --git a/kernel/module.c b/kernel/module.c
index 524da609c884..42e4e289d6c7 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3300,11 +3300,27 @@ static bool blacklisted(const char *module_name)
}
core_param(module_blacklist, module_blacklist, charp, 0400);
+/*
+ * Mark ro_after_init section with SHF_RO_AFTER_INIT so that
+ * layout_sections() can put it in the right place.
+ * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
+ */
+static const char * const ro_after_init_sections[] = {
+ ".data..ro_after_init",
+
+ /*
+ * __jump_table structures are never modified, with the exception of
+ * entries that refer to code in the __init section, which are
+ * annotated as such at module load time.
+ */
+ "__jump_table",
+};
+
static struct module *layout_and_allocate(struct load_info *info, int flags)
{
struct module *mod;
unsigned int ndx;
- int err;
+ int err, i;
err = check_modinfo(info->mod, info, flags);
if (err)
@@ -3319,23 +3335,12 @@ static struct module *layout_and_allocate(struct load_info *info, int flags)
/* We will do a special allocation for per-cpu sections later. */
info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
- /*
- * Mark ro_after_init section with SHF_RO_AFTER_INIT so that
- * layout_sections() can put it in the right place.
- * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
- */
- ndx = find_sec(info, ".data..ro_after_init");
- if (ndx)
- info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
- /*
- * Mark the __jump_table section as ro_after_init as well: these data
- * structures are never modified, with the exception of entries that
- * refer to code in the __init section, which are annotated as such
- * at module load time.
- */
- ndx = find_sec(info, "__jump_table");
- if (ndx)
- info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
+ /* Set sh_flags for read-only after init sections */
+ for (i = 0; i < ARRAY_SIZE(ro_after_init_sections); i++) {
+ ndx = find_sec(info, ro_after_init_sections[i]);
+ if (ndx)
+ info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
+ }
/* Determine total sizes, and put offsets in sh_entsize. For now
this is done generically; there doesn't appear to be any
--
2.21.0.392.gf8f6787159e-goog
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
