tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti head: 1dbc1eb4f898d3df3b663ce1d938693554877fd6 commit: 1dbc1eb4f898d3df3b663ce1d938693554877fd6 [26/26] x86/speculation: Add 'seccomp' Spectre v2 app to app protection mode config: x86_64-randconfig-x016-201846 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout 1dbc1eb4f898d3df3b663ce1d938693554877fd6 # save the attached .config to linux build tree make ARCH=x86_64
All errors (new ones prefixed by >>):
arch/x86/kernel/cpu/bugs.c: In function
'spectre_v2_app2app_select_mitigation':
>> arch/x86/kernel/cpu/bugs.c:343:4: error: 'app2app_mode' undeclared (first
>> use in this function); did you mean 'x2apic_mode'?
app2app_mode = SPECTRE_V2_APP2APP_SECCOMP;
^~~~~~~~~~~~
x2apic_mode
arch/x86/kernel/cpu/bugs.c:343:4: note: each undeclared identifier is
reported only once for each function it appears in
vim +343 arch/x86/kernel/cpu/bugs.c
317
318 static void __init
319 spectre_v2_app2app_select_mitigation(enum spectre_v2_mitigation_cmd
v2_cmd)
320 {
321 enum spectre_v2_app2app_mitigation mode =
SPECTRE_V2_APP2APP_NONE;
322 bool smt_possible = IS_ENABLED(CONFIG_SMP);
323
324 if (!boot_cpu_has(X86_FEATURE_IBPB) &&
!boot_cpu_has(X86_FEATURE_STIBP))
325 return;
326
327 if (cpu_smt_control == CPU_SMT_FORCE_DISABLED ||
328 cpu_smt_control == CPU_SMT_NOT_SUPPORTED)
329 smt_possible = false;
330
331 switch (spectre_v2_parse_app2app_cmdline(v2_cmd)) {
332 case SPECTRE_V2_APP2APP_CMD_NONE:
333 goto set_mode;
334 case SPECTRE_V2_APP2APP_CMD_FORCE:
335 mode = SPECTRE_V2_APP2APP_STRICT;
336 break;
337 case SPECTRE_V2_APP2APP_CMD_PRCTL:
338 mode = SPECTRE_V2_APP2APP_PRCTL;
339 break;
340 case SPECTRE_V2_APP2APP_CMD_AUTO:
341 case SPECTRE_V2_APP2APP_CMD_SECCOMP:
342 if (IS_ENABLED(CONFIG_SECCOMP))
> 343 app2app_mode = SPECTRE_V2_APP2APP_SECCOMP;
344 else
345 app2app_mode = SPECTRE_V2_APP2APP_PRCTL;
346 break;
347 }
348
349 /* Initialize Indirect Branch Prediction Barrier */
350 if (boot_cpu_has(X86_FEATURE_IBPB)) {
351 setup_force_cpu_cap(X86_FEATURE_USE_IBPB);
352
353 switch (mode) {
354 case SPECTRE_V2_APP2APP_STRICT:
355 static_branch_enable(&switch_to_always_ibpb);
356 break;
357 case SPECTRE_V2_APP2APP_PRCTL:
358 case SPECTRE_V2_APP2APP_SECCOMP:
359 static_branch_enable(&switch_to_cond_ibpb);
360 break;
361 default:
362 break;
363 }
364
365 pr_info("mitigation: Enabling %s Indirect Branch
Prediction Barrier\n",
366 mode == SPECTRE_V2_APP2APP_STRICT ? "forced" :
"conditional");
367 }
368
369 /* If enhanced IBRS is enabled no STIPB required */
370 if (spectre_v2_enabled == SPECTRE_V2_IBRS_ENHANCED)
371 return;
372
373 /*
374 * If STIBP is not available or SMT is not possible clear the
STIPB
375 * mode.
376 */
377 if (!smt_possible || !boot_cpu_has(X86_FEATURE_STIBP))
378 mode = SPECTRE_V2_APP2APP_NONE;
379 set_mode:
380 spectre_v2_app2app = mode;
381 /* Only print the STIBP mode when SMT possible */
382 if (smt_possible)
383 pr_info("%s\n", spectre_v2_app2app_strings[mode]);
384 }
385
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0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
Description: application/gzip
