Title: kernel de Linux
Description: En el kernel de Linux, se resolvió la siguiente vulnerabilidad: libbpf: corrige la desreferencia del puntero NULL en bpf_object__collect_prog_relos Se produjo un problema al leer un archivo ELF en libbpf.c durante la fuzzing: el programa recibió la señal SIGSEGV, falla de segmentación. 0x0000000000958e97 en bpf_object.collect_prog_relos () en libbpf.c:4206 4206 en libbpf.c (gdb) bt #0 0x0000000000958e97 en bpf_object.collect_prog_relos () en libbpf.c:4206 #1 0x0 00000000094f9d6 en bpf_object.collect_relos () en libbpf.c :6706 #2 0x000000000092bef3 en bpf_object_open () en libbpf.c:7437 #3 0x000000000092c046 en bpf_object.open_mem () en libbpf.c:7497 #4 0x0000000000924afa en LLVMFuzzerTest OneInput () en fuzz/bpf-object-fuzzer.c:16 # 5 0x000000000060be11 en testblitz_engine::fuzzer::Fuzzer::run_one () #6 0x000000000087ad92 en tracing::span::Span::in_scope () #7 0x00000000006078aa en testblitz_engine::fuzzer::util::walkdir () #8 0x00000000005f3217 en testblitz_engine::entrypoint::main::{{closure}} () #9 0x00000000005f2601 en main () (gdb) scn_data era nulo en este código (tools/lib/bpf/src/libbpf.c): if (rel ->r_offset % BPF_INSN_SZ || rel->r_offset >= scn_data->d_size) { Los scn_data se derivan del código anterior: scn = elf_sec_by_idx(obj, sec_idx); scn_data = elf_sec_data(obj, scn); relo_sec_name = elf_sec_str(obj, shdr->sh_name); nombre_sec = nombre_sec_elf(obj, scn); if (!relo_sec_name || !sec_name)// no verifica si scn_data es NULL return -EINVAL; En ciertos escenarios especiales, como la lectura de un archivo ELF con formato incorrecto, es posible que scn_data sea un puntero nulo.

In the Linux kernel, the following vulnerability has been resolved:

libbpf: Fix NULL pointer dereference in bpf_object__collect_prog_relos

An issue occurred while reading an ELF file in libbpf.c during fuzzing:

	Program received signal SIGSEGV, Segmentation fault.
	0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
	4206 in libbpf.c
	(gdb) bt
	#0 0x0000000000958e97 in bpf_object.collect_prog_relos () at libbpf.c:4206
	#1 0x000000000094f9d6 in bpf_object.collect_relos () at libbpf.c:6706
	#2 0x000000000092bef3 in bpf_object_open () at libbpf.c:7437
	#3 0x000000000092c046 in bpf_object.open_mem () at libbpf.c:7497
	#4 0x0000000000924afa in LLVMFuzzerTestOneInput () at fuzz/bpf-object-fuzzer.c:16
	#5 0x000000000060be11 in testblitz_engine::fuzzer::Fuzzer::run_one ()
	#6 0x000000000087ad92 in tracing::span::Span::in_scope ()
	#7 0x00000000006078aa in testblitz_engine::fuzzer::util::walkdir ()
	#8 0x00000000005f3217 in testblitz_engine::entrypoint::main::{{closure}} ()
	#9 0x00000000005f2601 in main ()
	(gdb)

scn_data was null at this code(tools/lib/bpf/src/libbpf.c):

	if (rel->r_offset % BPF_INSN_SZ || rel->r_offset >= scn_data->d_size) {

The scn_data is derived from the code above:

	scn = elf_sec_by_idx(obj, sec_idx);
	scn_data = elf_sec_data(obj, scn);

	relo_sec_name = elf_sec_str(obj, shdr->sh_name);
	sec_name = elf_sec_name(obj, scn);
	if (!relo_sec_name || !sec_name)// don't check whether scn_data is NULL
		return -EINVAL;

In certain special scenarios, such as reading a malformed ELF file,
it is possible that scn_data may be a null pointer

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

Linux https://git.kernel.org/stable/c/12473265f50c1e27b0dfd9735738ac418c4bfcce

Linux https://git.kernel.org/stable/c/5f3e436832e86b826a6450eb8d1aaa51205a758e

Linux https://git.kernel.org/stable/c/90dbf4535668042fac0d7201ce9e2c8c770c578a

Linux https://git.kernel.org/stable/c/ab26541270c722eedf8eefd62797c3ce3d18a91b

Linux https://git.kernel.org/stable/c/fc3a5534e2a8855427403113cbeb54af5837bbe0