جزئیات آسیب‌پذیری

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In the Linux kernel, the following vulnerability has been resolved: ftrace: Initialize modname and offset in print_rec() print_rec() leaves 'modname' and 'offset' uninitialized and kallsyms_lookup() only sets them on success. When the lookup fails like when a module is being loaded or unloaded, 'modname' holds a garbage value, passes the 'if (modname)' check, and is dereferenced by seq_printf(). Oops: general protection fault RIP: 0010:string+0x48/0xe0 Call Trace: vsnprintf+0x1f5/0x650 seq_printf+0x8e/0xb0 print_rec+0x6c/0xc0 t_show+0x4c/0x440 seq_read_iter+0x119/0x480 This can be triggered by reading available_filter_functions while a module is being loaded or unloaded. Initialize both variables so a failed lookup skips the module name.

• https://git.kernel.org/stable/c/753d5cba113a52cb155428f4ea93a4b0148c4bf1
• https://git.kernel.org/stable/c/0e5ff07be834abaf4280e1dca7f9591e339d0960
• https://git.kernel.org/stable/c/e2e6fb972bfec4a0551bc7c185bdb17f78f94997
• https://git.kernel.org/stable/c/8932e5a4df110a25578728526bb5a3dbc849d8a2
• https://git.kernel.org/stable/c/7271c064dd60d4456c5b90da757acd9420d06697
• https://git.kernel.org/stable/c/d97dba9ff13987d1fc415408557a54adde980311
• https://git.kernel.org/stable/c/e1f339ff3b83857b93baf8b88186275a413d445e