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Fail to open efirt device when no EFI on system.

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libefivar expects opening /dev/efi to indicate if the we can make efi
runtime calls. With a null routine, it was always succeeding leading
efi_variables_supported() to return the wrong value. Only succeed if
we have an efi_runtime table. Also, while I'm hear, out of an
abundance of caution, add a likely redundant check to make sure
efi_systbl is not NULL before dereferencing it. I know it can't be
NULL if efi_cfgtbl is non-NULL, but the compiler doesn't.
This commit is contained in:
Warner Losh 2017-08-08 20:44:16 +00:00
parent ac0ced90e0
commit 9057f54d74
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322278
3 changed files with 24 additions and 1 deletions
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11
sys/amd64/amd64/efirt.c
View file

@ -420,13 +420,22 @@ efi_uninit(void)
mtx_destroy(&efi_lock);
}
int
efi_rt_ok(void)
{
if (efi_runtime == NULL)
return (ENXIO);
return (0);
}
int
efi_get_table(struct uuid *uuid, void **ptr)
{
struct efi_cfgtbl *ct;
u_long count;
if (efi_cfgtbl == NULL)
if (efi_cfgtbl == NULL || efi_systbl == NULL)
return (ENXIO);
count = efi_systbl->st_entries;
ct = efi_cfgtbl;

1
sys/amd64/include/efi.h
View file

@ -49,6 +49,7 @@
struct uuid;
struct efi_tm;
int efi_rt_ok(void);
int efi_get_table(struct uuid *uuid, void **ptr);
int efi_get_time(struct efi_tm *tm);
int efi_get_time_locked(struct efi_tm *tm);

13
sys/dev/efidev/efidev.c
View file

@ -39,14 +39,27 @@ __FBSDID("$FreeBSD$");
#include <machine/efi.h>
#include <sys/efiio.h>
static d_open_t efidev_open;
static d_ioctl_t efidev_ioctl;
static struct cdevsw efi_cdevsw = {
.d_name = "efi",
.d_version = D_VERSION,
.d_open = efidev_open,
.d_ioctl = efidev_ioctl,
};
static int
efidev_open(struct cdev *dev __unused, int oflags __unused,
int devtype __unused, struct thread *td __unused)
{
/*
* Only return success when we have an actual runtime to call.
*/
return efi_rt_ok();
}
static int
efidev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
int flags __unused, struct thread *td __unused)