Hi Jeremy, kernel test robot noticed the following build errors:
[auto build test ERROR on arm64/for-next/core] [also build test ERROR on perf-tools-next/perf-tools-next tip/perf/core perf-tools/perf-tools linus/master v6.17-rc1 next-20250812] [cannot apply to acme/perf/core] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Jeremy-Linton/arm64-probes-Break-ret-out-from-bl-blr/20250811-221529 base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core patch link: https://lore.kernel.org/r/20250811141010.741989-6-jeremy.linton%40arm.com patch subject: [PATCH v5 5/7] arm64: uprobes: Add GCS support to uretprobes config: arm64-randconfig-r111-20250813 (https://download.01.org/0day-ci/archive/20250813/[email protected]/config) compiler: aarch64-linux-gcc (GCC) 13.4.0 reproduce: (https://download.01.org/0day-ci/archive/20250813/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): arch/arm64/kernel/probes/uprobes.c: In function 'arch_uretprobe_hijack_return_addr': >> arch/arm64/kernel/probes/uprobes.c:171:33: error: implicit declaration of >> function 'get_user_gcs'; did you mean 'put_user_gcs'? >> [-Werror=implicit-function-declaration] 171 | gcs_ret_vaddr = get_user_gcs((unsigned long __user *)gcspr, &err); | ^~~~~~~~~~~~ | put_user_gcs cc1: some warnings being treated as errors vim +171 arch/arm64/kernel/probes/uprobes.c 157 158 unsigned long 159 arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, 160 struct pt_regs *regs) 161 { 162 unsigned long orig_ret_vaddr; 163 unsigned long gcs_ret_vaddr; 164 int err = 0; 165 u64 gcspr; 166 167 orig_ret_vaddr = procedure_link_pointer(regs); 168 169 if (task_gcs_el0_enabled(current)) { 170 gcspr = read_sysreg_s(SYS_GCSPR_EL0); > 171 gcs_ret_vaddr = get_user_gcs((unsigned long __user > *)gcspr, &err); 172 if (err) { 173 force_sig(SIGSEGV); 174 goto out; 175 } 176 177 /* 178 * If the LR and GCS return addr don't match, then some kind of PAC 179 * signing or control flow occurred since entering the probed function. 180 * Likely because the user is attempting to retprobe on an instruction 181 * that isn't a function boundary or inside a leaf function. Explicitly 182 * abort this retprobe because it will generate a GCS exception. 183 */ 184 if (gcs_ret_vaddr != orig_ret_vaddr) { 185 orig_ret_vaddr = -1; 186 goto out; 187 } 188 189 put_user_gcs(trampoline_vaddr, (unsigned long __user *)gcspr, &err); 190 if (err) { 191 force_sig(SIGSEGV); 192 goto out; 193 } 194 } 195 196 /* Replace the return addr with trampoline addr */ 197 procedure_link_pointer_set(regs, trampoline_vaddr); 198 199 out: 200 return orig_ret_vaddr; 201 } 202 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
