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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Kiper <daniel.kiper@oracle.com>
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Date: Tue, 2 Oct 2018 18:49:26 +0200
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Subject: [PATCH] dl: Add support for persistent modules
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This type of modules cannot be unloaded. This is useful if a given
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functionality, e.g. UEFI secure boot shim signature verification, should
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not be disabled if it was enabled at some point in time. Somebody may
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say that we can use standalone GRUB2 here. That is true. However, the
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code is not so big nor complicated hence it make sense to support
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modularized configs too.
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Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
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Reviewed-by: Ross Philipson <ross.philipson@oracle.com>
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(cherry picked from commit ee7808e2197cbf5e8515d90ecbd81c9d0dd6fc15)
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---
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grub-core/commands/minicmd.c | 3 +++
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include/grub/dl.h | 13 +++++++++++++
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2 files changed, 16 insertions(+)
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diff --git a/grub-core/commands/minicmd.c b/grub-core/commands/minicmd.c
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index 46bf135e8..6d66b7c45 100644
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--- a/grub-core/commands/minicmd.c
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+++ b/grub-core/commands/minicmd.c
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@@ -137,6 +137,9 @@ grub_mini_cmd_rmmod (struct grub_command *cmd __attribute__ ((unused)),
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if (! mod)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no such module");
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+ if (grub_dl_is_persistent (mod))
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+ return grub_error (GRUB_ERR_BAD_ARGUMENT, "cannot unload persistent module");
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+
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if (grub_dl_unref (mod) <= 0)
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grub_dl_unload (mod);
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diff --git a/include/grub/dl.h b/include/grub/dl.h
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index 7b5bfb07c..f7cfe6482 100644
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--- a/include/grub/dl.h
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+++ b/include/grub/dl.h
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@@ -177,6 +177,7 @@ struct grub_dl
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{
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char *name;
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int ref_count;
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+ int persistent;
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grub_dl_dep_t dep;
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grub_dl_segment_t segment;
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Elf_Sym *symtab;
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@@ -242,6 +243,18 @@ grub_dl_get (const char *name)
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return 0;
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}
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+static inline void
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+grub_dl_set_persistent (grub_dl_t mod)
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+{
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+ mod->persistent = 1;
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+}
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+
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+static inline int
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+grub_dl_is_persistent (grub_dl_t mod)
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+{
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+ return mod->persistent;
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+}
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+
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#endif
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void * EXPORT_FUNC(grub_resolve_symbol) (const char *name);
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