diff options
| author | Shell <[email protected]> | 2023-02-24 14:52:16 +0800 |
|---|---|---|
| committer | GitHub <[email protected]> | 2023-02-24 14:52:16 +0800 |
| commit | 382e9bcac746b408b5b01ea2f59338428ab203dd (patch) | |
| tree | 448e8692183ad031b57afda6681aaa93caa56df9 /components/lwp/arch | |
| parent | 08c2a651360899ca59e90433dfb78579a642fd75 (diff) | |
[rt-smart] handling kernel from accessing unmapped user stack (#6957)
[rt-smart] handling kernel from accessing unmapped user stack
Diffstat (limited to 'components/lwp/arch')
| -rw-r--r-- | components/lwp/arch/risc-v/rv64/lwp_gcc.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/components/lwp/arch/risc-v/rv64/lwp_gcc.S b/components/lwp/arch/risc-v/rv64/lwp_gcc.S index c54726bc45..3977553dbf 100644 --- a/components/lwp/arch/risc-v/rv64/lwp_gcc.S +++ b/components/lwp/arch/risc-v/rv64/lwp_gcc.S @@ -121,6 +121,16 @@ arch_signal_quit: * routine in user stack */ user_do_signal: + /* prefetch ustack to avoid corrupted status in RESTORE/STORE pair below */ + LOAD t0, FRAME_OFF_SP(sp) + addi t1, t0, -CTX_REG_NR * REGBYTES + LOAD t2, (t0) + li t3, -0x1000 +1: + add t0, t0, t3 + LOAD t2, (t0) + bgt t0, t1, 1b + /** restore and backup kernel sp carefully to avoid leaking */ addi t0, sp, CTX_REG_NR * REGBYTES csrw sscratch, t0 |