6.8-stable review patch. If anyone has any objections, please let me know.
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From: Björn Töpel bjorn@rivosinc.com
commit c27fa53b858b4ee6552a719aa599c250cf98a586 upstream.
The RISC-V Vector specification states in "Appendix D: Calling Convention for Vector State" [1] that "Executing a system call causes all caller-saved vector registers (v0-v31, vl, vtype) and vstart to become unspecified.". In the RISC-V kernel this is called "discarding the vstate".
Returning from a signal handler via the rt_sigreturn() syscall, vector discard is also performed. However, this is not an issue since the vector state should be restored from the sigcontext, and therefore not care about the vector discard.
The "live state" is the actual vector register in the running context, and the "vstate" is the vector state of the task. A dirty live state, means that the vstate and live state are not in synch.
When vectorized user_from_copy() was introduced, an bug sneaked in at the restoration code, related to the discard of the live state.
An example when this go wrong:
1. A userland application is executing vector code 2. The application receives a signal, and the signal handler is entered. 3. The application returns from the signal handler, using the rt_sigreturn() syscall. 4. The live vector state is discarded upon entering the rt_sigreturn(), and the live state is marked as "dirty", indicating that the live state need to be synchronized with the current vstate. 5. rt_sigreturn() restores the vstate, except the Vector registers, from the sigcontext 6. rt_sigreturn() restores the Vector registers, from the sigcontext, and now the vectorized user_from_copy() is used. The dirty live state from the discard is saved to the vstate, making the vstate corrupt. 7. rt_sigreturn() returns to the application, which crashes due to corrupted vstate.
Note that the vectorized user_from_copy() is invoked depending on the value of CONFIG_RISCV_ISA_V_UCOPY_THRESHOLD. Default is 768, which means that vlen has to be larger than 128b for this bug to trigger.
The fix is simply to mark the live state as non-dirty/clean prior performing the vstate restore.
Link: https://github.com/riscv/riscv-isa-manual/releases/download/riscv-isa-releas... # [1] Reported-by: Charlie Jenkins charlie@rivosinc.com Reported-by: Vineet Gupta vgupta@kernel.org Fixes: c2a658d41924 ("riscv: lib: vectorize copy_to_user/copy_from_user") Signed-off-by: Björn Töpel bjorn@rivosinc.com Reviewed-by: Andy Chiu andy.chiu@sifive.com Tested-by: Vineet Gupta vineetg@rivosinc.com Link: https://lore.kernel.org/r/20240403072638.567446-1-bjorn@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/kernel/signal.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)
--- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -119,6 +119,13 @@ static long __restore_v_state(struct pt_ struct __sc_riscv_v_state __user *state = sc_vec; void __user *datap;
+ /* + * Mark the vstate as clean prior performing the actual copy, + * to avoid getting the vstate incorrectly clobbered by the + * discarded vector state. + */ + riscv_v_vstate_set_restore(current, regs); + /* Copy everything of __sc_riscv_v_state except datap. */ err = __copy_from_user(¤t->thread.vstate, &state->v_state, offsetof(struct __riscv_v_ext_state, datap)); @@ -133,13 +140,7 @@ static long __restore_v_state(struct pt_ * Copy the whole vector content from user space datap. Use * copy_from_user to prevent information leak. */ - err = copy_from_user(current->thread.vstate.datap, datap, riscv_v_vsize); - if (unlikely(err)) - return err; - - riscv_v_vstate_set_restore(current, regs); - - return err; + return copy_from_user(current->thread.vstate.datap, datap, riscv_v_vsize); } #else #define save_v_state(task, regs) (0)