On Thu, Apr 23, 2020 at 10:29:21AM -0500, Josh Poimboeuf wrote: > On Thu, Apr 23, 2020 at 07:59:31AM -0700, Randy Dunlap wrote: > > On 4/23/20 12:41 AM, Stephen Rothwell wrote: > > > Hi all, > > > > > > Changes since 20200422: > > > > > > > on x86_64: > > More truncation of functions by CONFIG_USBAN_TRAP. Kees? Looks like another randconfig with CONFIG_UBSAN_ALIGNMENT=y I will test this and see if my proposed Kconfig change solves it. -Kees > > > drivers/target/target_core_xcopy.o: warning: objtool: target_xcopy_do_work()+0x6dd: unreachable instruction > > 0000000000000170 <target_xcopy_read_source>: > 170: 55 push %rbp > 171: 48 89 e5 mov %rsp,%rbp > 174: 48 81 ec 40 03 00 00 sub $0x340,%rsp > 17b: 65 48 8b 0c 25 28 00 mov %gs:0x28,%rcx > 182: 00 00 > 184: 48 89 4d f8 mov %rcx,-0x8(%rbp) > 188: 31 c9 xor %ecx,%ecx > 18a: 83 e2 07 and $0x7,%edx > 18d: 75 34 jne 1c3 <target_xcopy_read_source+0x53> > 18f: 48 89 f0 mov %rsi,%rax > 192: 83 e0 07 and $0x7,%eax > 195: 75 2c jne 1c3 <target_xcopy_read_source+0x53> > 197: 48 8d 95 d0 fc ff ff lea -0x330(%rbp),%rdx > 19e: b9 65 00 00 00 mov $0x65,%ecx > 1a3: 48 c7 c6 00 00 00 00 mov $0x0,%rsi > 1a6: R_X86_64_32S .rodata.str1.1 > 1aa: 48 89 d7 mov %rdx,%rdi > 1ad: 48 c7 c2 00 00 00 00 mov $0x0,%rdx > 1b0: R_X86_64_32S .bss+0x560 > 1b4: f3 48 ab rep stos %rax,%es:(%rdi) > 1b7: 48 8d bd 48 ff ff ff lea -0xb8(%rbp),%rdi > 1be: e8 00 00 00 00 callq 1c3 <target_xcopy_read_source+0x53> > 1bf: R_X86_64_PLT32 __init_swait_queue_head-0x4 > 1c3: 0f 0b ud2 > 1c5: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) > 1cc: 00 00 00 00 > > > net/mac80211/rx.o: warning: objtool: __ieee80211_check_fast_rx_iface()+0x79: unreachable instruction > > 0000000000007be0 <ieee80211_check_fast_rx>: > 7be0: 40 f6 c7 07 test $0x7,%dil > 7be4: 75 44 jne 7c2a <ieee80211_check_fast_rx+0x4a> > 7be6: 48 8b 57 50 mov 0x50(%rdi),%rdx > 7bea: 48 89 d0 mov %rdx,%rax > 7bed: 83 e0 07 and $0x7,%eax > 7bf0: 75 3c jne 7c2e <ieee80211_check_fast_rx+0x4e> > 7bf2: 55 push %rbp > 7bf3: b9 06 00 00 00 mov $0x6,%ecx > 7bf8: 48 89 e5 mov %rsp,%rbp > 7bfb: 48 83 ec 38 sub $0x38,%rsp > 7bff: 48 8d 75 d0 lea -0x30(%rbp),%rsi > 7c03: 48 89 f7 mov %rsi,%rdi > 7c06: f3 48 ab rep stos %rax,%es:(%rdi) > 7c09: 48 8b 82 d8 03 00 00 mov 0x3d8(%rdx),%rax > 7c10: 48 89 45 d0 mov %rax,-0x30(%rbp) > 7c14: 8b 82 68 0f 00 00 mov 0xf68(%rdx),%eax > 7c1a: 89 45 d8 mov %eax,-0x28(%rbp) > 7c1d: 48 c7 c0 00 00 00 00 mov $0x0,%rax > 7c20: R_X86_64_32S rfc1042_header > 7c24: a8 03 test $0x3,%al > 7c26: 75 04 jne 7c2c <ieee80211_check_fast_rx+0x4c> > 7c28: 0f 0b ud2 > 7c2a: 0f 0b ud2 > 7c2c: 0f 0b ud2 > 7c2e: 0f 0b ud2 > > -- > Josh > -- Kees Cook
