CVE-2024-50151

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> smb: client: fix OOBs when building SMB2_IOCTL request<br /> <br /> When using encryption, either enforced by the server or when using<br /> &amp;#39;seal&amp;#39; mount option, the client will squash all compound request buffers<br /> down for encryption into a single iov in smb2_set_next_command().<br /> <br /> SMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the<br /> SMB2_IOCTL request in the first iov, and if the user passes an input<br /> buffer that is greater than 328 bytes, smb2_set_next_command() will<br /> end up writing off the end of @rqst-&gt;iov[0].iov_base as shown below:<br /> <br /> mount.cifs //srv/share /mnt -o ...,seal<br /> ln -s $(perl -e "print(&amp;#39;a&amp;#39;)for 1..1024") /mnt/link<br /> <br /> BUG: KASAN: slab-out-of-bounds in<br /> smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> Write of size 4116 at addr ffff8881148fcab8 by task ln/859<br /> <br /> CPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS<br /> 1.16.3-2.fc40 04/01/2014<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x5d/0x80<br /> ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> print_report+0x156/0x4d9<br /> ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> ? __virt_addr_valid+0x145/0x310<br /> ? __phys_addr+0x46/0x90<br /> ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> kasan_report+0xda/0x110<br /> ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> kasan_check_range+0x10f/0x1f0<br /> __asan_memcpy+0x3c/0x60<br /> smb2_set_next_command.cold+0x1d6/0x24c [cifs]<br /> smb2_compound_op+0x238c/0x3840 [cifs]<br /> ? kasan_save_track+0x14/0x30<br /> ? kasan_save_free_info+0x3b/0x70<br /> ? vfs_symlink+0x1a1/0x2c0<br /> ? do_symlinkat+0x108/0x1c0<br /> ? __pfx_smb2_compound_op+0x10/0x10 [cifs]<br /> ? kmem_cache_free+0x118/0x3e0<br /> ? cifs_get_writable_path+0xeb/0x1a0 [cifs]<br /> smb2_get_reparse_inode+0x423/0x540 [cifs]<br /> ? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs]<br /> ? rcu_is_watching+0x20/0x50<br /> ? __kmalloc_noprof+0x37c/0x480<br /> ? smb2_create_reparse_symlink+0x257/0x490 [cifs]<br /> ? smb2_create_reparse_symlink+0x38f/0x490 [cifs]<br /> smb2_create_reparse_symlink+0x38f/0x490 [cifs]<br /> ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs]<br /> ? find_held_lock+0x8a/0xa0<br /> ? hlock_class+0x32/0xb0<br /> ? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs]<br /> cifs_symlink+0x24f/0x960 [cifs]<br /> ? __pfx_make_vfsuid+0x10/0x10<br /> ? __pfx_cifs_symlink+0x10/0x10 [cifs]<br /> ? make_vfsgid+0x6b/0xc0<br /> ? generic_permission+0x96/0x2d0<br /> vfs_symlink+0x1a1/0x2c0<br /> do_symlinkat+0x108/0x1c0<br /> ? __pfx_do_symlinkat+0x10/0x10<br /> ? strncpy_from_user+0xaa/0x160<br /> __x64_sys_symlinkat+0xb9/0xf0<br /> do_syscall_64+0xbb/0x1d0<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> RIP: 0033:0x7f08d75c13bb