Webb[ 22.178607] BUG: KASAN: user-memory-access on address 00007f90291c7ec0 [ 22.180409] Read of size 18 by task v86d/170 [ 22.181842] CPU: 0 PID: 170 Comm: … WebbKASan is a dynamic memory error detector designed to find use-after-free and out-of-bounds bugs. The main idea of KASAN is to use shadow memory to record whether each byte of memory is safe to access or not, and use compiler's instrumentation to check the shadow memory on each memory access.
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Webb17 nov. 2005 · KASAn shadow memory when KASan is in use. The range from MODULES_VADDR to the top of the memory is shadowed here with 1 bit per byte of memory. 00001000. TASK_SIZE-1. User space mappings Per-thread mappings are placed here via the mmap() system ... If they wish to access these areas, they must set … Webb14 jan. 2024 · The magic values assigned to shadow memory used by KASan is different: 0xFA means the memory has been free:ed so accessing it means use-after-free. 0xFB is a free:ed managed resources (devm_* accessors) in the Linux kernel. 0xFC and 0xFE means we access a kmalloc() redzone indicating an out-of-bounds access. meet the teacher preschool template
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WebbLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH v3 0/4] KUnit-KASAN Integration @ 2024-04-01 18:09 Patricia Alfonso 2024-04-01 18:09 ` [PATCH v3 2/4] KUnit: KASAN Integration Patricia Alfonso ` (3 more replies) 0 siblings, 4 replies; 11+ messages in thread From: Patricia Alfonso @ 2024-04-01 18:09 UTC (permalink / raw) … Webb31 mars 2024 · [ 10.745796] BUG: KASAN: user-memory-access in __clear_user_memset+0x258/0x3ac [ 10.747260] Write of size 2687 at addr 000de581 by task init/1 Use __memcpy() and __memset() instead to allow userspace access, which is of course the intent of these functions. WebbMessage ID: bfa0fdedfe25f65e5caa4e410f074ddbac7a0b59.1643047180.git.andreyknvl@google.com … meet the teacher questions