CVE-2024-47688

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> driver core: Fix a potential null-ptr-deref in module_add_driver()<br /> <br /> Inject fault while probing of-fpga-region, if kasprintf() fails in<br /> module_add_driver(), the second sysfs_remove_link() in exit path will cause<br /> null-ptr-deref as below because kernfs_name_hash() will call strlen() with<br /> NULL driver_name.<br /> <br /> Fix it by releasing resources based on the exit path sequence.<br /> <br /> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]<br /> Mem abort info:<br /> ESR = 0x0000000096000005<br /> EC = 0x25: DABT (current EL), IL = 32 bits<br /> SET = 0, FnV = 0<br /> EA = 0, S1PTW = 0<br /> FSC = 0x05: level 1 translation fault<br /> Data abort info:<br /> ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000<br /> CM = 0, WnR = 0, TnD = 0, TagAccess = 0<br /> GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0<br /> [dfffffc000000000] address between user and kernel address ranges<br /> Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP<br /> Dumping ftrace buffer:<br /> (ftrace buffer empty)<br /> Modules linked in: of_fpga_region(+) fpga_region fpga_bridge cfg80211 rfkill 8021q garp mrp stp llc ipv6 [last unloaded: of_fpga_region]<br /> CPU: 2 UID: 0 PID: 2036 Comm: modprobe Not tainted 6.11.0-rc2-g6a0e38264012 #295<br /> Hardware name: linux,dummy-virt (DT)<br /> pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)<br /> pc : strlen+0x24/0xb0<br /> lr : kernfs_name_hash+0x1c/0xc4<br /> sp : ffffffc081f97380<br /> x29: ffffffc081f97380 x28: ffffffc081f97b90 x27: ffffff80c821c2a0<br /> x26: ffffffedac0be418 x25: 0000000000000000 x24: ffffff80c09d2000<br /> x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000<br /> x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000001840<br /> x17: 0000000000000000 x16: 0000000000000000 x15: 1ffffff8103f2e42<br /> x14: 00000000f1f1f1f1 x13: 0000000000000004 x12: ffffffb01812d61d<br /> x11: 1ffffff01812d61c x10: ffffffb01812d61c x9 : dfffffc000000000<br /> x8 : 0000004fe7ed29e4 x7 : ffffff80c096b0e7 x6 : 0000000000000001<br /> x5 : ffffff80c096b0e0 x4 : 1ffffffdb990efa2 x3 : 0000000000000000<br /> x2 : 0000000000000000 x1 : dfffffc000000000 x0 : 0000000000000000<br /> Call trace:<br /> strlen+0x24/0xb0<br /> kernfs_name_hash+0x1c/0xc4<br /> kernfs_find_ns+0x118/0x2e8<br /> kernfs_remove_by_name_ns+0x80/0x100<br /> sysfs_remove_link+0x74/0xa8<br /> module_add_driver+0x278/0x394<br /> bus_add_driver+0x1f0/0x43c<br /> driver_register+0xf4/0x3c0<br /> __platform_driver_register+0x60/0x88<br /> of_fpga_region_init+0x20/0x1000 [of_fpga_region]<br /> do_one_initcall+0x110/0x788<br /> do_init_module+0x1dc/0x5c8<br /> load_module+0x3c38/0x4cac<br /> init_module_from_file+0xd4/0x128<br /> idempotent_init_module+0x2cc/0x528<br /> __arm64_sys_finit_module+0xac/0x100<br /> invoke_syscall+0x6c/0x258<br /> el0_svc_common.constprop.0+0x160/0x22c<br /> do_el0_svc+0x44/0x5c<br /> el0_svc+0x48/0xb8<br /> el0t_64_sync_handler+0x13c/0x158<br /> el0t_64_sync+0x190/0x194<br /> Code: f2fbffe1 a90157f4 12000802 aa0003f5 (38e16861)<br /> ---[ end trace 0000000000000000 ]---<br /> Kernel panic - not syncing: Oops: Fatal exception