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Atish reports that on RISC-V, accessing the EFI variables causes
a kernel panic. An objdump of the file verifies that, since the
global pointer for efi_var_buf ends up in .GOT section which is
not mapped in virtual address space for Linux.
<snip of efi_var_mem_find>
0000000000000084 <efi_var_mem_find>:
84: 715d addi sp,sp,-80
* objdump -dr
0000000000000086 <.LCFI2>:
86: e0a2 sd s0,64(sp)
88: fc26 sd s1,56(sp)
8a: e486 sd ra,72(sp)
8c: f84a sd s2,48(sp)
8e: f44e sd s3,40(sp)
90: f052 sd s4,32(sp)
92: ec56 sd s5,24(sp)
94: 00000497 auipc s1,0x0
94: R_RISCV_GOT_HI20 efi_var_buf
98: 0004b483 ld s1,0(s1) # 94 <.LCFI2+0xe>
98: R_RISCV_PCREL_LO12_I .L0
98: R_RISCV_RELAX *ABS*
* objdump -t
0000000000000084 g F .text.efi_runtime 00000000000000b8 efi_var_mem_find
With the patch applied:
* objdump -dr
0000000000000086 <.LCFI2>:
86: e0a2 sd s0,64(sp)
88: fc26 sd s1,56(sp)
8a: e486 sd ra,72(sp)
8c: f84a sd s2,48(sp)
8e: f44e sd s3,40(sp)
90: f052 sd s4,32(sp)
92: ec56 sd s5,24(sp)
94: 00000497 auipc s1,0x0
94: R_RISCV_PCREL_HI20 .LANCHOR0
94: R_RISCV_RELAX *ABS*
98: 00048493 mv s1,s1
98: R_RISCV_PCREL_LO12_I .L0
98: R_RISCV_RELAX *ABS*
* objdump -t
0000000000000008 l O .data.efi_runtime 0000000000000008 efi_var_buf
On arm64 this works, because there's no .GOT entries for this
and everything is converted to relative references.
* objdump -dr (identical pre-post patch, only the new function shows up)
00000000000000b4 <efi_var_mem_find>:
b4: aa0003ee mov x14, x0
b8: 9000000a adrp x10, 0 <efi_var_mem_compare>
b8: R_AARCH64_ADR_PREL_PG_HI21 .data.efi_runtime
bc: 91000140 add x0, x10, #0x0
bc: R_AARCH64_ADD_ABS_LO12_NC .data.efi_runtime
c0: aa0103ed mov x13, x1
c4: 79400021 ldrh w1, [x1]
c8: aa0203eb mov x11, x2
cc: f9400400 ldr x0, [x0, #8]
d0: b940100c ldr w12, [x0, #16]
d4: 8b0c000c add x12, x0, x12
So let's switch efi_var_buf to static and create a helper function for
anyone that needs to update it.
Fixes: e01aed47d6a0 ("efi_loader: Enable run-time variable support for tee based variables")
Reported-by: Atish Patra <atishp@atishpatra.org>
Tested-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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When opening an OP-TEE session we need to check the internal return
value of OP-TEE call arguments as well the return code of the
function itself.
The code was also ignoring to close the OP-TEE session in case the
shared memory registration failed.
Fixes: f042e47e8fb43 ("efi_loader: Implement EFI variable handling via OP-TEE")
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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We recently added functions for storing/restoring variables
from a file to a memory backed buffer marked as __efi_runtime_data
commit f1f990a8c958 ("efi_loader: memory buffer for variables")
commit 5f7dcf079de8 ("efi_loader: UEFI variable persistence")
Using the same idea we now can support GetVariable() and GetNextVariable()
on the OP-TEE based variables as well.
So let's re-arrange the code a bit and move the commmon code for
accessing variables out of efi_variable.c. Create common functions for
reading variables from memory that both implementations can use on
run-time. Then just use those functions in the run-time variants of the
OP-TEE based EFI variable implementation and initialize the memory
buffer on ExitBootServices()
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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The current code does not trim the output buffer correctly.
In fact it doesn't trim the buffer at all, since it calculates a wrong
value for it, which isn't even applied.
So let's remove the unused temporary size variable and trim the buffer
correctly.
Since we are editing efi_get_next_variable_name_int(), fix an indentation
error along the way.
Fixes: f042e47e8fb43 ("efi_loader: Implement EFI variable handling via OP-TEE")
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Remove superfluous conversion to (u8 *) for memcpy argument.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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Currently we only check for the return value of tee_invoke_func().
Although OP-TEE and StMM will correctly set param[1].u.value.a and we'll
eventually return an error, the correct thing to do is check for the
OP_TEE return code as well.
So let's check for that and move tee_shm_free() and tee_close_session()
before exiting with an error to make sure we always clear the registered
memory.
Fixes: f042e47e8fb43 ("efi_loader: Implement EFI variable handling via OP-TEE")
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Use EFI_DEVICE_ERROR for TEE communication problems.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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Instead of adding the definition for the specific MM SVC used in
StandAloneMM we added the one used in the standard SMC calls.
So change the value from -4 to -5 to match the correct one defined in
EDK2 and rename them to avoid future confusion
Fixes 23a397d2e2fb: ("efi_loader: Add headers for EDK2 StandAloneMM communication")
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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Update the UEFI secure state when variable 'PK' is updated in the TEE
variables implementation.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
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A previous commit adds support for displaying variables RO flag.
Let's add it on the TEE backed variable storage as well.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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Separate the remaining UEFI variable API functions GetNextVariableName and
QueryVariableInfo() from internal functions implementing them.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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We currently have two implementations of UEFI variables:
* variables provided via an OP-TEE module
* variables stored in the U-Boot environment
Read only variables are up to now only implemented in the U-Boot
environment implementation.
Provide a common interface for both implementations that allows handling
read-only variables.
As variable access is limited to very few source files put variable
related definitions into new include efi_variable.h instead of efi_loader.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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There's 2 variables in efi_get_next_variable_name() checking the size of
the variable name. Let's get rid of the reduntant definition and
simplitfy the code a bit.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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In OP-TEE we can run EDK2's StandAloneMM on a secure partition.
StandAloneMM is responsible for the UEFI variable support. In
combination with OP-TEE and it's U-Boot supplicant, variables are
authenticated/validated in secure world and stored on an RPMB partition.
So let's add a new config option in U-Boot implementing the necessary
calls to OP-TEE for the variable management.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Pipat Methavanitpong <pipat1010@gmail.com>
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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