CVE-2024-35905

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Protección contra desbordamiento int para el tamaño de acceso a la pila. Este parche reintroduce la protección contra que el tamaño de acceso a la memoria de la pila sea negativo; el tamaño de acceso puede parecer negativo como resultado de desbordar su representación int firmada. En realidad, esto no debería suceder, ya que existen otras protecciones en el camino, pero debemos protegernos contra ello de todos modos. A una ruta de código le faltaban dichas protecciones (corregidas en el parche anterior de la serie), lo que provocaba accesos a matrices fuera de los límites en check_stack_range_initialized(). Este parche hace que falle la verificación de un programa con un tamaño de acceso tan absurdo. Esta verificación solía existir de una manera más indirecta, pero se eliminó inadvertidamente en a833a17aeac7.

A flaw was found in the Linux kernel. An integer overflow vulnerability exists in the access size of a stack, such that the size of the access stack can appear negative as a result of overflowing its signed int representation. This issue can result in denial of service.

In the Linux kernel, the following vulnerability has been resolved: bpf: Protect against int overflow for stack access size This patch re-introduces protection against the size of access to stack memory being negative; the access size can appear negative as a result of overflowing its signed int representation. This should not actually happen, as there are other protections along the way, but we should protect against it anyway. One code path was missing such protections (fixed in the previous patch in the series), causing out-of-bounds array accesses in check_stack_range_initialized(). This patch causes the verification of a program with such a non-sensical access size to fail. This check used to exist in a more indirect way, but was inadvertendly removed in a833a17aeac7.

This update for the Linux Kernel 5.14.21-150400_24_111 fixes several issues. The following security issues were fixed. Fixed int overflow for stack access size. Sch_cake: do not call cake_destroy from cake_init. Fixed potential UAF in is_valid_oplock_break. Smb: client: fix use-after-free bug in cifs_debug_data_proc_show. Fixed potential UAF in smb2_is_network_name_deleted. Fixed potential UAF in cifs_stats_proc_show. Fixed potential UAF in smb2_is_valid_lease_break. Intermittent nfs mount failures. Fixed potential UAF in cifs_signal_cifsd_for_reconnect. Gpiolib: cdev: Fix use after free in lineinfo_changed_notify. Net: do not leave a dangling sk pointer, when socket creation fails hfsplus: fix uninit-value in copy_name. Fs/9p: only translate RWX permissions for plain 9P2000. Hsr: Prevent use after free in prp_create_tagged_frame. Fixed a general protection fault in i915_perf_open_ioctl. Set gtt bound flag in amdgpu_ttm_gart_bind. Fixed use-after-free bugs caused by sco_sock_timeout. Drm/client: Fully protect modes with dev->mode_config.mutex. Fixed false-positive lockdep splat for spin_lock in __unix_gc. Fixed double free of the ha->vp_map pointer. Fixed underflow in parse_server_interfaces. Fixed Integer Overflow or Wraparound vulnerability in x86 and ARM md, raid, raid5 modules. Fixed use-after-free in ip6_route_mpath_notify. Fixed memory corruption in wifi/iwlwifi. Fixed an out-of-bound bug in ipvlan caused by unset skb->mac_header. Fixed SDMA off-by-one error in _pad_sdma_tx_descs. Fixed a race condition in nfc_llcp_sock_get and nfc_llcp_sock_get_sn. Fixed a race condition in the GSM 0710 tty multiplexor via the GSMIOC_SETCONF ioctl that could lead to local privilege escalation.