diff options
Diffstat (limited to 'meta/recipes-bsp/grub/files/CVE-2022-28736-loader-efi-chainloader-Use-grub_loader_set_ex.patch')
| -rw-r--r-- | meta/recipes-bsp/grub/files/CVE-2022-28736-loader-efi-chainloader-Use-grub_loader_set_ex.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/meta/recipes-bsp/grub/files/CVE-2022-28736-loader-efi-chainloader-Use-grub_loader_set_ex.patch b/meta/recipes-bsp/grub/files/CVE-2022-28736-loader-efi-chainloader-Use-grub_loader_set_ex.patch new file mode 100644 index 0000000000..5741e53f42 --- /dev/null +++ b/meta/recipes-bsp/grub/files/CVE-2022-28736-loader-efi-chainloader-Use-grub_loader_set_ex.patch @@ -0,0 +1,86 @@ +From 04c86e0bb7b58fc2f913f798cdb18934933e532d Mon Sep 17 00:00:00 2001 +From: Chris Coulson <chris.coulson@canonical.com> +Date: Tue, 5 Apr 2022 11:48:58 +0100 +Subject: [PATCH] loader/efi/chainloader: Use grub_loader_set_ex() + +This ports the EFI chainloader to use grub_loader_set_ex() in order to fix +a use-after-free bug that occurs when grub_cmd_chainloader() is executed +more than once before a boot attempt is performed. + +Fixes: CVE-2022-28736 + +Signed-off-by: Chris Coulson <chris.coulson@canonical.com> +Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> + +Upstream-Status: Backport +CVE: CVE-2022-28736 + +Reference to upstream patch: +https://git.savannah.gnu.org/cgit/grub.git/commit/?id=04c86e0bb7b58fc2f913f798cdb18934933e532d + +Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com> +--- + grub-core/loader/efi/chainloader.c | 16 +++++++--------- + 1 file changed, 7 insertions(+), 9 deletions(-) + +diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c +index d1602c89b..7557eb269 100644 +--- a/grub-core/loader/efi/chainloader.c ++++ b/grub-core/loader/efi/chainloader.c +@@ -44,11 +44,10 @@ GRUB_MOD_LICENSE ("GPLv3+"); + + static grub_dl_t my_mod; + +-static grub_efi_handle_t image_handle; +- + static grub_err_t +-grub_chainloader_unload (void) ++grub_chainloader_unload (void *context) + { ++ grub_efi_handle_t image_handle = (grub_efi_handle_t) context; + grub_efi_loaded_image_t *loaded_image; + grub_efi_boot_services_t *b; + +@@ -64,8 +63,9 @@ grub_chainloader_unload (void) + } + + static grub_err_t +-grub_chainloader_boot (void) ++grub_chainloader_boot (void *context) + { ++ grub_efi_handle_t image_handle = (grub_efi_handle_t) context; + grub_efi_boot_services_t *b; + grub_efi_status_t status; + grub_efi_uintn_t exit_data_size; +@@ -225,6 +225,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)), + grub_efi_physical_address_t address = 0; + grub_efi_uintn_t pages = 0; + grub_efi_char16_t *cmdline = NULL; ++ grub_efi_handle_t image_handle = NULL; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); +@@ -405,7 +406,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)), + efi_call_2 (b->free_pages, address, pages); + grub_free (file_path); + +- grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 0); ++ grub_loader_set_ex (grub_chainloader_boot, grub_chainloader_unload, image_handle, 0); + return 0; + + fail: +@@ -423,10 +424,7 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)), + efi_call_2 (b->free_pages, address, pages); + + if (image_handle != NULL) +- { +- efi_call_1 (b->unload_image, image_handle); +- image_handle = NULL; +- } ++ efi_call_1 (b->unload_image, image_handle); + + grub_dl_unref (my_mod); + +-- +2.34.1 + |