[JITLink] Add fixup value range check

This patch makes jitlink to report an out of range error when the fixup value out of range

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D107328

llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp

@@ -162,6 +162,11 @@ static uint32_t extractBits(uint32_t Num, unsigned Low, unsigned Size) {
   return (Num & (((1ULL << (Size + 1)) - 1) << Low)) >> Low;
 }
 
+static inline bool isInRangeForImmS32(int64_t Value) {
+  return (Value >= std::numeric_limits<int32_t>::min() &&
+          Value <= std::numeric_limits<int32_t>::max());
+}
+
 class ELFJITLinker_riscv : public JITLinker<ELFJITLinker_riscv> {
   friend class JITLinker<ELFJITLinker_riscv>;
 
@@ -191,12 +196,17 @@ private:
     }
     case R_RISCV_HI20: {
       int64_t Value = (E.getTarget().getAddress() + E.getAddend()).getValue();
-      int32_t Hi = (Value + 0x800) & 0xFFFFF000;
+      int64_t Hi = Value + 0x800;
+      if (LLVM_UNLIKELY(!isInRangeForImmS32(Hi)))
+        return makeTargetOutOfRangeError(G, B, E);
       uint32_t RawInstr = *(little32_t *)FixupPtr;
-      *(little32_t *)FixupPtr = (RawInstr & 0xFFF) | static_cast<uint32_t>(Hi);
+      *(little32_t *)FixupPtr =
+          (RawInstr & 0xFFF) | (static_cast<uint32_t>(Hi & 0xFFFFF000));
       break;
     }
     case R_RISCV_LO12_I: {
+      // FIXME: We assume that R_RISCV_HI20 is present in object code and pairs
+      // with current relocation R_RISCV_LO12_I. So here may need a check.
       int64_t Value = (E.getTarget().getAddress() + E.getAddend()).getValue();
       int32_t Lo = Value & 0xFFF;
       uint32_t RawInstr = *(little32_t *)FixupPtr;
@@ -206,23 +216,32 @@ private:
     }
     case R_RISCV_CALL: {
       int64_t Value = E.getTarget().getAddress() + E.getAddend() - FixupAddress;
-      int32_t Hi = (Value + 0x800) & 0xFFFFF000;
+      int64_t Hi = Value + 0x800;
+      if (LLVM_UNLIKELY(!isInRangeForImmS32(Hi)))
+        return makeTargetOutOfRangeError(G, B, E);
       int32_t Lo = Value & 0xFFF;
       uint32_t RawInstrAuipc = *(little32_t *)FixupPtr;
       uint32_t RawInstrJalr = *(little32_t *)(FixupPtr + 4);
-      *(little32_t *)FixupPtr = RawInstrAuipc | static_cast<uint32_t>(Hi);
+      *(little32_t *)FixupPtr =
+          RawInstrAuipc | (static_cast<uint32_t>(Hi & 0xFFFFF000));
       *(little32_t *)(FixupPtr + 4) =
           RawInstrJalr | (static_cast<uint32_t>(Lo) << 20);
       break;
     }
     case R_RISCV_PCREL_HI20: {
       int64_t Value = E.getTarget().getAddress() + E.getAddend() - FixupAddress;
-      int32_t Hi = (Value + 0x800) & 0xFFFFF000;
+      int64_t Hi = Value + 0x800;
+      if (LLVM_UNLIKELY(!isInRangeForImmS32(Hi)))
+        return makeTargetOutOfRangeError(G, B, E);
       uint32_t RawInstr = *(little32_t *)FixupPtr;
-      *(little32_t *)FixupPtr = (RawInstr & 0xFFF) | static_cast<uint32_t>(Hi);
+      *(little32_t *)FixupPtr =
+          (RawInstr & 0xFFF) | (static_cast<uint32_t>(Hi & 0xFFFFF000));
       break;
     }
     case R_RISCV_PCREL_LO12_I: {
+      // FIXME: We assume that R_RISCV_PCREL_HI20 is present in object code and
+      // pairs with current relocation R_RISCV_PCREL_LO12_I. So here may need a
+      // check.
       auto RelHI20 = getRISCVPCRelHi20(E);
       if (!RelHI20)
         return RelHI20.takeError();
@@ -235,6 +254,9 @@ private:
       break;
     }
     case R_RISCV_PCREL_LO12_S: {
+      // FIXME: We assume that R_RISCV_PCREL_HI20 is present in object code and
+      // pairs with current relocation R_RISCV_PCREL_LO12_S. So here may need a
+      // check.
       auto RelHI20 = getRISCVPCRelHi20(E);
       int64_t Value = RelHI20->getTarget().getAddress() +
                       RelHI20->getAddend() - E.getTarget().getAddress();

llvm/test/ExecutionEngine/JITLink/RISCV/ELF_abs_reloc.s

@@ -4,12 +4,12 @@
 # RUN: llvm-mc -triple=riscv32 -filetype=obj \
 # RUN:     -o %t/elf_riscv32_non_pc_indirect_reloc.o %s
 # RUN: llvm-jitlink -noexec \
-# RUN:     -slab-allocate 100Kb -slab-address 0xfff00000 -slab-page-size 4096 \
+# RUN:     -slab-allocate 100Kb -slab-address 0x1ff00000 -slab-page-size 4096 \
-# RUN:     -define-abs external_data=0xfff10000 \
+# RUN:     -define-abs external_data=0x1ff10000 \
 # RUN:     -check %s %t/elf_riscv64_non_pc_indirect_reloc.o
 # RUN: llvm-jitlink -noexec \
-# RUN:     -slab-allocate 100Kb -slab-address 0xfff00000 -slab-page-size 4096 \
+# RUN:     -slab-allocate 100Kb -slab-address 0x1ff00000 -slab-page-size 4096 \
-# RUN:     -define-abs external_data=0xfff10000 \
+# RUN:     -define-abs external_data=0x1ff10000 \
 # RUN:     -check %s %t/elf_riscv32_non_pc_indirect_reloc.o
 #
 

llvm/test/ExecutionEngine/JITLink/RISCV/ELF_pc_indirect.s

@@ -4,11 +4,11 @@
 # RUN: llvm-mc -triple=riscv32 -position-independent -filetype=obj \
 # RUN:     -o %t/elf_riscv32_sm_pic_reloc.o %s
 # RUN: llvm-jitlink -noexec \
-# RUN:     -slab-allocate 100Kb -slab-address 0xfff00000 -slab-page-size 4096 \
+# RUN:     -slab-allocate 100Kb -slab-address 0x1ff00000 -slab-page-size 4096 \
 # RUN:     -define-abs external_func=0x1 -define-abs external_data=0x2 \
 # RUN:     -check %s %t/elf_riscv64_sm_pic_reloc.o
 # RUN: llvm-jitlink -noexec \
-# RUN:     -slab-allocate 100Kb -slab-address 0xfff00000 -slab-page-size 4096 \
+# RUN:     -slab-allocate 100Kb -slab-address 0x1ff00000 -slab-page-size 4096 \
 # RUN:     -define-abs external_func=0x1 -define-abs external_data=0x2 \
 # RUN:     -check %s %t/elf_riscv32_sm_pic_reloc.o
 #