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authorAndreas Oetken <andreas.oetken@siemens.com>2021-02-19 09:41:03 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-03-04 13:38:16 +0300
commit1fe02a86fa92dd22b79dd25b1d0fe5cab7024f14 (patch)
tree638a5f01c2e1d52b00e4c6619b178a2b3a797113 /arch/nios2/kernel
parent9dfb367a23827e4b85872d09f6c57e79b33fa2fd (diff)
downloadlinux-1fe02a86fa92dd22b79dd25b1d0fe5cab7024f14.tar.xz
nios2: fixed broken sys_clone syscall
[ Upstream commit 9abcfcb20320e8f693e89d86573b58e6289931cb ] The tls pointer must be pushed on the stack prior to calling nios2_clone as it is the 5th function argument. Prior handling of the tls pointer was done inside former called function copy_thread_tls using the r8 register from the current_pt_regs directly. This was a bad design and resulted in the current bug introduced in 04bd52fb. Fixes: 04bd52fb ("nios2: enable HAVE_COPY_THREAD_TLS, switch to kernel_clone_args") Signed-off-by: Andreas Oetken <andreas.oetken@siemens.com> Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/nios2/kernel')
-rw-r--r--arch/nios2/kernel/entry.S3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/nios2/kernel/entry.S b/arch/nios2/kernel/entry.S
index da8442450e46..0794cd7803df 100644
--- a/arch/nios2/kernel/entry.S
+++ b/arch/nios2/kernel/entry.S
@@ -389,7 +389,10 @@ ENTRY(ret_from_interrupt)
*/
ENTRY(sys_clone)
SAVE_SWITCH_STACK
+ subi sp, sp, 4 /* make space for tls pointer */
+ stw r8, 0(sp) /* pass tls pointer (r8) via stack (5th argument) */
call nios2_clone
+ addi sp, sp, 4
RESTORE_SWITCH_STACK
ret