diff options
| author | Necip Fazil Yildiran <necip@google.com> | 2020-07-29 07:36:25 +0000 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2020-07-29 13:44:49 +0200 |
| commit | cbca8e0f043495ea2332604d8ce066891710e861 (patch) | |
| tree | cf7eb1825cd4133c77d9ce8c4697190baa21b755 /pkg/csource | |
| parent | a3d497bf6ccc7141b66ada4b01a05068a09b31c3 (diff) | |
executor: added syz_io_uring_setup to wrap both setup and mmap
It is hard for the fuzzer to generate correct programs using mmap calls
with fuzzer-provided mmap length. This wrapper ensures correct length
computation.
Diffstat (limited to 'pkg/csource')
| -rw-r--r-- | pkg/csource/generated.go | 74 |
1 files changed, 73 insertions, 1 deletions
diff --git a/pkg/csource/generated.go b/pkg/csource/generated.go index 3c25c2570..6234a1262 100644 --- a/pkg/csource/generated.go +++ b/pkg/csource/generated.go @@ -3539,7 +3539,7 @@ static long syz_emit_ethernet(volatile long a0, volatile long a1, volatile long } #endif -#if SYZ_EXECUTOR || __NR_syz_io_uring_submit || __NR_syz_io_uring_complete +#if SYZ_EXECUTOR || __NR_syz_io_uring_submit || __NR_syz_io_uring_complete || __NR_syz_io_uring_setup #define SIZEOF_IO_URING_SQE 64 #define SIZEOF_IO_URING_CQE 16 @@ -3586,6 +3586,78 @@ static long syz_io_uring_complete(volatile long a0) #endif +#if SYZ_EXECUTOR || __NR_syz_io_uring_setup + +struct io_sqring_offsets { + uint32 head; + uint32 tail; + uint32 ring_mask; + uint32 ring_entries; + uint32 flags; + uint32 dropped; + uint32 array; + uint32 resv1; + uint64 resv2; +}; + +struct io_cqring_offsets { + uint32 head; + uint32 tail; + uint32 ring_mask; + uint32 ring_entries; + uint32 overflow; + uint32 cqes; + uint64 resv[2]; +}; + +struct io_uring_params { + uint32 sq_entries; + uint32 cq_entries; + uint32 flags; + uint32 sq_thread_cpu; + uint32 sq_thread_idle; + uint32 features; + uint32 resv[4]; + struct io_sqring_offsets sq_off; + struct io_cqring_offsets cq_off; +}; + +#define IORING_OFF_SQ_RING 0 +#define IORING_OFF_SQES 0x10000000ULL + +#include <sys/mman.h> +#include <unistd.h> + +#ifndef __NR_io_uring_setup +#ifdef __alpha__ +#define __NR_io_uring_setup 535 +#else +#define __NR_io_uring_setup 425 +#endif +#endif +static long syz_io_uring_setup(volatile long a0, volatile long a1, volatile long a2, volatile long a3, volatile long a4, volatile long a5) +{ + uint32 entries = (uint32)a0; + struct io_uring_params* setup_params = (struct io_uring_params*)a1; + void* vma1 = (void*)a2; + void* vma2 = (void*)a3; + void** ring_ptr_out = (void**)a4; + void** sqes_ptr_out = (void**)a5; + + uint32 fd_io_uring = syscall(__NR_io_uring_setup, entries, setup_params); + uint32 sq_ring_sz = setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32); + uint32 cq_ring_sz = setup_params->cq_off.cqes + setup_params->cq_entries * SIZEOF_IO_URING_CQE; + uint32 ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz; + *ring_ptr_out = mmap(vma1, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQ_RING); + + uint32 sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE; + *sqes_ptr_out = mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES); + + return fd_io_uring; +} + +#endif + #if SYZ_EXECUTOR || __NR_syz_io_uring_submit static long syz_io_uring_submit(volatile long a0, volatile long a1, volatile long a2, volatile long a3) |