Messages in this thread Patch in this message | | | From | Vineet Gupta <> | Subject | [PATCH] ARC: fix CONFIG_HARDENED_USERCOPY | Date | Wed, 9 Jun 2021 15:12:11 -0700 |
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Currently enabling this triggers a warning
| usercopy: Kernel memory overwrite attempt detected to kernel text (offset 155633, size 11)! | usercopy: BUG: failure at mm/usercopy.c:99/usercopy_abort()! | |gcc generated __builtin_trap |Path: /bin/busybox |CPU: 0 PID: 84 Comm: init Not tainted 5.4.22 | |[ECR ]: 0x00090005 => gcc generated __builtin_trap |[EFA ]: 0x9024fcaa |[BLINK ]: usercopy_abort+0x8a/0x8c |[ERET ]: memfd_fcntl+0x0/0x470 |[STAT32]: 0x80080802 : IE K |BTA: 0x901ba38c SP: 0xbe161ecc FP: 0xbf9fe950 |LPS: 0x90677408 LPE: 0x9067740c LPC: 0x00000000 |r00: 0x0000003c r01: 0xbf0ed280 r02: 0x00000000 |r03: 0xbe15fa30 r04: 0x00d2803e r05: 0x00000000 |r06: 0x675d7000 r07: 0x00000000 r08: 0x675d9c00 |r09: 0x00000000 r10: 0x0000035c r11: 0x61206572 |r12: 0x9024fcaa r13: 0x0000000b r14: 0x0000000b |r15: 0x00000000 r16: 0x90169ffc r17: 0x90168000 |r18: 0x00000000 r19: 0xbf092010 r20: 0x00000001 |r21: 0x00000011 r22: 0x5ffffff1 r23: 0x90169ff1 |r24: 0xbe196c00 r25: 0xbf0ed280 | |Stack Trace: | memfd_fcntl+0x0/0x470 | usercopy_abort+0x8a/0x8c | __check_object_size+0x10e/0x138 | copy_strings+0x1f4/0x38c | __do_execve_file+0x352/0x848 | EV_Trap+0xcc/0xd0
Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/15 Reported-by: Evgeniy Didin <didin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> --- arch/arc/kernel/vmlinux.lds.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S index 33ce59d91461..e2146a8da195 100644 --- a/arch/arc/kernel/vmlinux.lds.S +++ b/arch/arc/kernel/vmlinux.lds.S @@ -57,7 +57,6 @@ SECTIONS .init.ramfs : { INIT_RAM_FS } . = ALIGN(PAGE_SIZE); - _stext = .; HEAD_TEXT_SECTION INIT_TEXT_SECTION(L1_CACHE_BYTES) @@ -83,6 +82,7 @@ SECTIONS .text : { _text = .; + _stext = .; TEXT_TEXT SCHED_TEXT CPUIDLE_TEXT -- 2.25.1
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