diff options
| author | Alexandre Ghiti <alexandre.ghiti@canonical.com> | 2021-12-06 13:46:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-09 11:20:47 +0300 |
| commit | 4a5c7a61ff506a7cc385cd952038183a2d095880 (patch) | |
| tree | d176c591ec3aa2ee6d93ed7d60361ef6c596b5fd /arch/riscv | |
| parent | 6b45437959dcfa177df32ac63318d3e1d7377523 (diff) | |
| download | linux-4a5c7a61ff506a7cc385cd952038183a2d095880.tar.xz | |
riscv: Initialize thread pointer before calling C functions
commit 35d33c76d68dfacc330a8eb477b51cc647c5a847 upstream.
Because of the stack canary feature that reads from the current task
structure the stack canary value, the thread pointer register "tp" must
be set before calling any C function from head.S: by chance, setup_vm
and all the functions that it calls does not seem to be part of the
functions where the canary check is done, but in the following commits,
some functions will.
Fixes: f2c9699f65557a31 ("riscv: Add STACKPROTECTOR supported")
Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/kernel/head.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 1a819c18bede..47d1411db0a9 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -261,6 +261,7 @@ clear_bss_done: REG_S a0, (a2) /* Initialize page tables and relocate to virtual addresses */ + la tp, init_task la sp, init_thread_union + THREAD_SIZE mv a0, s1 call setup_vm |