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From: H.J. Lu <hjl@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r11-9578] x86: Generate INT3 for __builtin_eh_return Date: Wed, 16 Feb 2022 14:01:30 +0000 (GMT) [thread overview] Message-ID: <20220216140130.20AE53857C7D@sourceware.org> (raw) https://gcc.gnu.org/g:978956485a663493130b02f787095095d163290e commit r11-9578-g978956485a663493130b02f787095095d163290e Author: H.J. Lu <hjl.tools@gmail.com> Date: Wed Jan 5 18:04:21 2022 -0800 x86: Generate INT3 for __builtin_eh_return Generate INT3 after indirect jmp in exception return for -fcf-protection with -mharden-sls=indirect-jmp. gcc/ PR target/103925 * config/i386/i386.c (ix86_output_indirect_function_return): Generate INT3 after indirect jmp for -mharden-sls=indirect-jmp. gcc/testsuite/ PR target/103925 * gcc.target/i386/harden-sls-6.c: New test. (cherry picked from commit c2e5c4feed32c808591b5278f680bbabe63eb225) Diff: --- gcc/config/i386/i386.c | 9 ++++++--- gcc/testsuite/gcc.target/i386/harden-sls-6.c | 18 ++++++++++++++++++ 2 files changed, 24 insertions(+), 3 deletions(-) diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index e83a4e54592..3ef209169dd 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -16077,11 +16077,14 @@ ix86_output_indirect_function_return (rtx ret_op) } else output_indirect_thunk (regno); - - return ""; } else - return "%!jmp\t%A0"; + { + output_asm_insn ("%!jmp\t%A0", &ret_op); + if (ix86_harden_sls & harden_sls_indirect_jmp) + fputs ("\tint3\n", asm_out_file); + } + return ""; } /* Output the assembly for a call instruction. */ diff --git a/gcc/testsuite/gcc.target/i386/harden-sls-6.c b/gcc/testsuite/gcc.target/i386/harden-sls-6.c new file mode 100644 index 00000000000..9068eb64008 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/harden-sls-6.c @@ -0,0 +1,18 @@ +/* { dg-do compile { target { ! ia32 } } } */ +/* { dg-options "-O2 -fcf-protection -mharden-sls=indirect-jmp" } */ + +struct _Unwind_Context _Unwind_Resume_or_Rethrow_this_context; + +void offset (int); + +struct _Unwind_Context { + void *reg[7]; +} _Unwind_Resume_or_Rethrow() { + struct _Unwind_Context cur_contextcur_context = + _Unwind_Resume_or_Rethrow_this_context; + offset(0); + __builtin_eh_return ((long) offset, 0); +} + +/* { dg-final { scan-assembler "jmp\[ \t\]+\\*%rcx" } } */ +/* { dg-final { scan-assembler-times "int3" 1 } } */
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