On 2020-07-17 10:42 a.m., Kees Cook wrote:
The "FIRMWARE_EFI_EMBEDDED" enum is a "where", not a "what". It should not be distinguished separately from just "FIRMWARE", as this confuses the LSMs about what is being loaded. Additionally, there was no actual validation of the firmware contents happening.
Fixes: e4c2c0ff00ec ("firmware: Add new platform fallback mechanism and firmware_request_platform()") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook keescook@chromium.org
Acked-by: Scott Branden scott.branden@broadcom.com
To aid in backporting, this change is made before moving kernel_read_file() to separate header/source files.
drivers/base/firmware_loader/fallback_platform.c | 2 +- include/linux/fs.h | 3 +-- 2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/base/firmware_loader/fallback_platform.c b/drivers/base/firmware_loader/fallback_platform.c index 685edb7dd05a..6958ab1a8059 100644 --- a/drivers/base/firmware_loader/fallback_platform.c +++ b/drivers/base/firmware_loader/fallback_platform.c @@ -17,7 +17,7 @@ int firmware_fallback_platform(struct fw_priv *fw_priv, u32 opt_flags) if (!(opt_flags & FW_OPT_FALLBACK_PLATFORM)) return -ENOENT;
- rc = security_kernel_load_data(LOADING_FIRMWARE_EFI_EMBEDDED);
- rc = security_kernel_load_data(LOADING_FIRMWARE); if (rc) return rc;
diff --git a/include/linux/fs.h b/include/linux/fs.h index 95fc775ed937..f50a35d54a61 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2993,11 +2993,10 @@ static inline void i_readcount_inc(struct inode *inode) #endif extern int do_pipe_flags(int *, int); -/* This is a list of *what* is being read, not *how*. */ +/* This is a list of *what* is being read, not *how* nor *where*. */ #define __kernel_read_file_id(id) \ id(UNKNOWN, unknown) \ id(FIRMWARE, firmware) \
- id(FIRMWARE_EFI_EMBEDDED, firmware) \ id(MODULE, kernel-module) \ id(KEXEC_IMAGE, kexec-image) \ id(KEXEC_INITRAMFS, kexec-initramfs) \