diff --git a/lld/ELF/Config.h b/lld/ELF/Config.h
--- a/lld/ELF/Config.h
+++ b/lld/ELF/Config.h
@@ -182,6 +182,7 @@
   bool relocatable;
   bool relrPackDynRelocs;
   bool saveTemps;
+  llvm::Optional<uint32_t> shuffleSectionSeed;
   bool singleRoRx;
   bool shared;
   bool isStatic = false;
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -956,6 +956,8 @@
   config->rpath = getRpath(args);
   config->relocatable = args.hasArg(OPT_relocatable);
   config->saveTemps = args.hasArg(OPT_save_temps);
+  if (args.hasArg(OPT_shuffle_sections))
+    config->shuffleSectionSeed = args::getInteger(args, OPT_shuffle_sections, 0);
   config->searchPaths = args::getStrings(args, OPT_library_path);
   config->sectionStartMap = getSectionStartMap(args);
   config->shared = args.hasArg(OPT_shared);
diff --git a/lld/ELF/Options.td b/lld/ELF/Options.td
--- a/lld/ELF/Options.td
+++ b/lld/ELF/Options.td
@@ -499,6 +499,8 @@
   HelpText<"The format used for serializing remarks (default: YAML)">;
 defm plugin_opt: Eq<"plugin-opt", "specifies LTO options for compatibility with GNU linkers">;
 def save_temps: F<"save-temps">;
+def shuffle_sections: J<"shuffle-sections=">, MetaVarName<"<seed>">,
+  HelpText<"Shuffle input sections using the given seed. If 0, use a random seed">;
 def thinlto_cache_dir: J<"thinlto-cache-dir=">,
   HelpText<"Path to ThinLTO cached object file directory">;
 defm thinlto_cache_policy: Eq<"thinlto-cache-policy", "Pruning policy for the ThinLTO cache">;
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -1205,6 +1205,27 @@
   return i;
 }
 
+// Adds random priorities to sections not already in the map.
+static void maybeShuffle(DenseMap<const InputSectionBase *, int> &order) {
+  if (!config->shuffleSectionSeed)
+    return;
+
+  std::vector<int> priorities(inputSections.size() - order.size());
+  // Existing priorities are < 0, so use priorities >= 0 for the missing
+  // sections.
+  int curPrio = 0;
+  for (int &prio : priorities)
+    prio = curPrio++;
+  uint32_t seed = *config->shuffleSectionSeed;
+  std::mt19937 g(seed ? seed : std::random_device()());
+  std::shuffle(priorities.begin(), priorities.end(), g);
+  int prioIndex = 0;
+  for (InputSectionBase *sec : inputSections) {
+    if (order.try_emplace(sec, priorities[prioIndex]).second)
+      ++prioIndex;
+  }
+}
+
 // Builds section order for handling --symbol-ordering-file.
 static DenseMap<const InputSectionBase *, int> buildSectionOrder() {
   DenseMap<const InputSectionBase *, int> sectionOrder;
@@ -1384,6 +1405,7 @@
 template <class ELFT> void Writer<ELFT>::sortInputSections() {
   // Build the order once since it is expensive.
   DenseMap<const InputSectionBase *, int> order = buildSectionOrder();
+  maybeShuffle(order);
   for (BaseCommand *base : script->sectionCommands)
     if (auto *sec = dyn_cast<OutputSection>(base))
       sortSection(sec, order);
diff --git a/lld/docs/ld.lld.1 b/lld/docs/ld.lld.1
--- a/lld/docs/ld.lld.1
+++ b/lld/docs/ld.lld.1
@@ -456,6 +456,8 @@
 Set address of section.
 .It Fl -shared , Fl -Bsharable
 Build a shared object.
+.It Fl -shuffle-sections Ns = Ns Ar seed
+Shuffle input sections using the given seed. If 0, use a random seed.
 .It Fl -soname Ns = Ns Ar value , Fl h Ar value
 Set
 .Dv DT_SONAME
diff --git a/lld/test/ELF/shuffle-sections.s b/lld/test/ELF/shuffle-sections.s
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/shuffle-sections.s
@@ -0,0 +1,47 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
+
+# RUN: ld.lld %t.o -o %t.out
+# RUN: llvm-readelf -x .text %t.out | FileCheck %s
+# CHECK: Hex dump of section '.text':
+# CHECK-NEXT: 01020304
+
+## --shuffle-sections= shuffles input sections.
+# RUN: ld.lld --shuffle-sections=1 %t.o -o %t1.out
+# RUN: llvm-readelf -x .text %t1.out | FileCheck %s --check-prefix=SHUFFLE1
+# SHUFFLE1: Hex dump of section '.text':
+# SHUFFLE1-NEXT: 01020403
+
+## Test that --shuffle-sections= can be used with --symbol-ordering-file
+# RUN: echo "foo" > %t_order.txt
+# RUN: echo "_start " >> %t_order.txt
+
+# RUN: ld.lld --symbol-ordering-file %t_order.txt --shuffle-sections=2 %t.o -o %t2.out
+# RUN: llvm-readelf -x .text %t2.out | FileCheck %s --check-prefix=SHUFFLE2
+# SHUFFLE2: Hex dump of section '.text':
+# SHUFFLE2-NEXT: 02cccccc 010403
+
+# RUN: ld.lld --symbol-ordering-file %t_order.txt --shuffle-sections=3 %t.o -o %t3.out
+# RUN: llvm-readelf -x .text %t3.out | FileCheck %s --check-prefix=SHUFFLE3
+# SHUFFLE3: Hex dump of section '.text':
+# SHUFFLE3-NEXT: 02cccccc 010304
+
+## .text has an alignment of 4.
+.global _start
+_start:
+  .byte 1
+
+.section .text.foo,"ax"
+.global foo
+foo:
+  .byte 2
+
+.section .text.bar,"ax"
+.global bar
+bar:
+  .byte 3
+
+.section .text.zed,"ax"
+.global zed
+zed:
+  .byte 4