[PATCH] D55428: [Docs] Expand -fstack-protector and -fstack-protector-all info

Carey Williams via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Mon Dec 17 02:14:57 PST 2018

This revision was automatically updated to reflect the committed changes.
Closed by commit rL349335: [Docs] Expand -fstack-protector and -fstack-protector-all (authored by carwil, committed by ).
Herald added a subscriber: llvm-commits.

Changed prior to commit:





Index: cfe/trunk/include/clang/Driver/Options.td
--- cfe/trunk/include/clang/Driver/Options.td
+++ cfe/trunk/include/clang/Driver/Options.td
@@ -1639,11 +1639,18 @@
     Flags<[CC1Option]>, HelpText<"Char is unsigned">;
 def fsplit_stack : Flag<["-"], "fsplit-stack">, Group<f_Group>;
 def fstack_protector_all : Flag<["-"], "fstack-protector-all">, Group<f_Group>,
-  HelpText<"Force the usage of stack protectors for all functions">;
+  HelpText<"Enable stack protectors for all functions">;
 def fstack_protector_strong : Flag<["-"], "fstack-protector-strong">, Group<f_Group>,
-  HelpText<"Use a strong heuristic to apply stack protectors to functions">;
+  HelpText<"Enable stack protectors for some functions vulnerable to stack smashing. "
+           "Compared to -fstack-protector, this uses a stronger heuristic "
+           "that includes functions containing arrays of any size (and any type), "
+           "as well as any calls to alloca or the taking of an address from a local variable">;
 def fstack_protector : Flag<["-"], "fstack-protector">, Group<f_Group>,
-  HelpText<"Enable stack protectors for functions potentially vulnerable to stack smashing">;
+  HelpText<"Enable stack protectors for some functions vulnerable to stack smashing. "
+           "This uses a loose heuristic which considers functions vulnerable "
+           "if they contain a char (or 8bit integer) array or constant sized calls to "
+           "alloca, which are of greater size than ssp-buffer-size (default: 8 bytes). "
+           "All variable sized calls to alloca are considered vulnerable">;
 def fstandalone_debug : Flag<["-"], "fstandalone-debug">, Group<f_Group>, Flags<[CoreOption]>,
   HelpText<"Emit full debug info for all types used by the program">;
 def fno_standalone_debug : Flag<["-"], "fno-standalone-debug">, Group<f_Group>, Flags<[CoreOption]>,

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