经过测试发现：会触发kernel oops。继续使用copy_{to,from}_user()替代memcpy()测试。测试发现：read()...
当标号9999出发生缺页异常时,系统在“__ex_table”section总将找不到修复地址,因为memcpy没有像copy_from_user那样定义一个“__ex_table”section,此时do_page_fault将通过no_context函数产生Oops。极有可能会看到类似如下信息: Unable to handle kernel NULL pointer dereference at virtual address 00000fe0 所有...
COPY ship_mode_t1 FROM '/home/omm/ds_ship_mode.dat' WITH(format 'text', delimiter E'\t', ignore_extra_data 'true', noescaping 'true'); Copy data from the /home/omm/ds_ship_mode.dat file to the ship_mode_t1 table, with the import format set to FIXED, fixed-length format spe...
内核和用户空间完全可以是不同的两套地址空间。OS X 就是用这种方式让 32-bit kernel 运行 64-bit ...
copy_from_user(void *to, const void __user *from, unsigned long n) { might_sleep(); if (access_ok(VERIFY_READ, from, n)) n = __copy_from_user(to, from, n); else memset(to, 0, n); return n; } 首先这个函数是可以睡眠的,它调用might_sleep()来处理,它在include/linux/kernel....
if (access_ok(VERIFY_READ, from, n)) n = __copy_from_user(to, from, n); else memset(to, 0, n); return n; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 首先这个函数是可以睡眠的,它调用might_sleep()来处理,它在include/linux/kernel.h中定义,本质也就是调用schedule(),转到其他进程....
From: Jeff Hansen <jhansen@cardaccess-inc.com> Subject: [PATCH] no highpage On ASUS WL-500gP there are many unexpected "Segmentation fault"s that seem to be caused by a kernel. They can be avoided by: 1) Disabling highpage 2) Using flush_cache_mm in flush_cache_dup_mm For details...
kmalloc(sizeof(struct bcm_target_params), GFP_KERNEL);if(Adapter->pstargetparams ==NULL)return-ENOMEM; }if(psFwInfo->u32FirmwareLength !=sizeof(struct bcm_target_params))return-EIO; retval =copy_from_user(Adapter->pstargetparams,
* If we might get machine checks from kernel accesses during the * core dump, let's get those errors early rather than during the * IO. This is not performance-critical enough to warrant having * all the machine check logic in the iovec paths. ...
copy_from_user(void *to, const void __user *from, unsigned long n) { might_sleep(); if (access_ok(VERIFY_READ, from, n)) n = __copy_from_user(to, from, n); else memset(to, 0, n); return n; } 首先这个函数是可以睡眠的,它调用might_sleep()来处理,它在include/linux/kernel....