On Fri 04-04-25 13:31:29, Edward Adam Davis wrote: > syzbot reported a slab-out-of-bounds Read in isofs_fh_to_parent. [1] > > The handle_bytes value passed in by the reproducing program is equal to 12. > In handle_to_path(), only 12 bytes of memory are allocated for the structure > file_handle->f_handle member, which causes an out-of-bounds access when > accessing the member parent_block of the structure isofs_fid in isofs, > because accessing parent_block requires at least 16 bytes of f_handle. > Here, fh_len is used to indirectly confirm that the value of handle_bytes > is greater than 3 before accessing parent_block. > > [1] > BUG: KASAN: slab-out-of-bounds in isofs_fh_to_parent+0x1b8/0x210 fs/isofs/export.c:183 > Read of size 4 at addr ffff0000cc030d94 by task syz-executor215/6466 > CPU: 1 UID: 0 PID: 6466 Comm: syz-executor215 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > Call trace: > show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:408 [inline] > print_report+0x198/0x550 mm/kasan/report.c:521 > kasan_report+0xd8/0x138 mm/kasan/report.c:634 > __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 > isofs_fh_to_parent+0x1b8/0x210 fs/isofs/export.c:183 > exportfs_decode_fh_raw+0x2dc/0x608 fs/exportfs/expfs.c:523 > do_handle_to_path+0xa0/0x198 fs/fhandle.c:257 > handle_to_path fs/fhandle.c:385 [inline] > do_handle_open+0x8cc/0xb8c fs/fhandle.c:403 > __do_sys_open_by_handle_at fs/fhandle.c:443 [inline] > __se_sys_open_by_handle_at fs/fhandle.c:434 [inline] > __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:434 > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > Allocated by task 6466: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x40/0x78 mm/kasan/common.c:68 > kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 > poison_kmalloc_redzone mm/kasan/common.c:377 [inline] > __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 > kasan_kmalloc include/linux/kasan.h:260 [inline] > __do_kmalloc_node mm/slub.c:4294 [inline] > __kmalloc_noprof+0x32c/0x54c mm/slub.c:4306 > kmalloc_noprof include/linux/slab.h:905 [inline] > handle_to_path fs/fhandle.c:357 [inline] > do_handle_open+0x5a4/0xb8c fs/fhandle.c:403 > __do_sys_open_by_handle_at fs/fhandle.c:443 [inline] > __se_sys_open_by_handle_at fs/fhandle.c:434 [inline] > __arm64_sys_open_by_handle_at+0x80/0x94 fs/fhandle.c:434 > __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] > invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 > el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 > do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 > el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 > el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 > el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 > > Reported-by: syzbot+4d7cd7dd0ce1aa8d5c65@xxxxxxxxxxxxxxxxxxxxxxxxx > Closes: https://syzkaller.appspot.com/bug?extid=4d7cd7dd0ce1aa8d5c65 > Tested-by: syzbot+4d7cd7dd0ce1aa8d5c65@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Edward Adam Davis <eadavis@xxxxxx> Thanks! This is indeed an old bug :). Added to my tree. Honza > --- > fs/isofs/export.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/isofs/export.c b/fs/isofs/export.c > index 35768a63fb1d..421d247fae52 100644 > --- a/fs/isofs/export.c > +++ b/fs/isofs/export.c > @@ -180,7 +180,7 @@ static struct dentry *isofs_fh_to_parent(struct super_block *sb, > return NULL; > > return isofs_export_iget(sb, > - fh_len > 2 ? ifid->parent_block : 0, > + fh_len > 3 ? ifid->parent_block : 0, > ifid->parent_offset, > fh_len > 4 ? ifid->parent_generation : 0); > } > -- > 2.43.0 > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
