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riscv: Initialize thread pointer before calling C functions

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commit 35d33c76d6 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: f2c9699f65 ("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>
This commit is contained in:
Alexandre Ghiti 2021-12-06 11:46:56 +01:00 • committed by Greg Kroah-Hartman
commit 4a5c7a61ff
1 changed files with 1 additions and 0 deletions
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arch/riscv/kernel/head.S
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@ -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