From: Edward Lo edward.lo@ambergroup.io
[ Upstream commit 6db620863f8528ed9a9aa5ad323b26554a17881d ]
This adds sanity checks for data run offset. We should make sure data run offset is legit before trying to unpack them, otherwise we may encounter use-after-free or some unexpected memory access behaviors.
[ 82.940342] BUG: KASAN: use-after-free in run_unpack+0x2e3/0x570 [ 82.941180] Read of size 1 at addr ffff888008a8487f by task mount/240 [ 82.941670] [ 82.942069] CPU: 0 PID: 240 Comm: mount Not tainted 5.19.0+ #15 [ 82.942482] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 82.943720] Call Trace: [ 82.944204] <TASK> [ 82.944471] dump_stack_lvl+0x49/0x63 [ 82.944908] print_report.cold+0xf5/0x67b [ 82.945141] ? __wait_on_bit+0x106/0x120 [ 82.945750] ? run_unpack+0x2e3/0x570 [ 82.946626] kasan_report+0xa7/0x120 [ 82.947046] ? run_unpack+0x2e3/0x570 [ 82.947280] __asan_load1+0x51/0x60 [ 82.947483] run_unpack+0x2e3/0x570 [ 82.947709] ? memcpy+0x4e/0x70 [ 82.947927] ? run_pack+0x7a0/0x7a0 [ 82.948158] run_unpack_ex+0xad/0x3f0 [ 82.948399] ? mi_enum_attr+0x14a/0x200 [ 82.948717] ? run_unpack+0x570/0x570 [ 82.949072] ? ni_enum_attr_ex+0x1b2/0x1c0 [ 82.949332] ? ni_fname_type.part.0+0xd0/0xd0 [ 82.949611] ? mi_read+0x262/0x2c0 [ 82.949970] ? ntfs_cmp_names_cpu+0x125/0x180 [ 82.950249] ntfs_iget5+0x632/0x1870 [ 82.950621] ? ntfs_get_block_bmap+0x70/0x70 [ 82.951192] ? evict+0x223/0x280 [ 82.951525] ? iput.part.0+0x286/0x320 [ 82.951969] ntfs_fill_super+0x1321/0x1e20 [ 82.952436] ? put_ntfs+0x1d0/0x1d0 [ 82.952822] ? vsprintf+0x20/0x20 [ 82.953188] ? mutex_unlock+0x81/0xd0 [ 82.953379] ? set_blocksize+0x95/0x150 [ 82.954001] get_tree_bdev+0x232/0x370 [ 82.954438] ? put_ntfs+0x1d0/0x1d0 [ 82.954700] ntfs_fs_get_tree+0x15/0x20 [ 82.955049] vfs_get_tree+0x4c/0x130 [ 82.955292] path_mount+0x645/0xfd0 [ 82.955615] ? putname+0x80/0xa0 [ 82.955955] ? finish_automount+0x2e0/0x2e0 [ 82.956310] ? kmem_cache_free+0x110/0x390 [ 82.956723] ? putname+0x80/0xa0 [ 82.957023] do_mount+0xd6/0xf0 [ 82.957411] ? path_mount+0xfd0/0xfd0 [ 82.957638] ? __kasan_check_write+0x14/0x20 [ 82.957948] __x64_sys_mount+0xca/0x110 [ 82.958310] do_syscall_64+0x3b/0x90 [ 82.958719] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 82.959341] RIP: 0033:0x7fd0d1ce948a [ 82.960193] Code: 48 8b 0d 11 fa 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 008 [ 82.961532] RSP: 002b:00007ffe59ff69a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 82.962527] RAX: ffffffffffffffda RBX: 0000564dcc107060 RCX: 00007fd0d1ce948a [ 82.963266] RDX: 0000564dcc107260 RSI: 0000564dcc1072e0 RDI: 0000564dcc10fce0 [ 82.963686] RBP: 0000000000000000 R08: 0000564dcc107280 R09: 0000000000000020 [ 82.964272] R10: 00000000c0ed0000 R11: 0000000000000202 R12: 0000564dcc10fce0 [ 82.964785] R13: 0000564dcc107260 R14: 0000000000000000 R15: 00000000ffffffff
Signed-off-by: Edward Lo edward.lo@ambergroup.io Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/attrib.c | 13 +++++++++++++ fs/ntfs3/attrlist.c | 5 +++++ fs/ntfs3/frecord.c | 14 ++++++++++++++ fs/ntfs3/fslog.c | 9 +++++++++ fs/ntfs3/inode.c | 5 +++++ 5 files changed, 46 insertions(+)
diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c index 71f870d497ae..0d354560d323 100644 --- a/fs/ntfs3/attrib.c +++ b/fs/ntfs3/attrib.c @@ -101,6 +101,10 @@ static int attr_load_runs(struct ATTRIB *attr, struct ntfs_inode *ni,
asize = le32_to_cpu(attr->size); run_off = le16_to_cpu(attr->nres.run_off); + + if (run_off > asize) + return -EINVAL; + err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, vcn ? *vcn : svcn, Add2Ptr(attr, run_off), asize - run_off); @@ -1232,6 +1236,10 @@ int attr_load_runs_vcn(struct ntfs_inode *ni, enum ATTR_TYPE type, }
ro = le16_to_cpu(attr->nres.run_off); + + if (ro > le32_to_cpu(attr->size)) + return -EINVAL; + err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, svcn, Add2Ptr(attr, ro), le32_to_cpu(attr->size) - ro); if (err < 0) @@ -1901,6 +1909,11 @@ int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes) u16 le_sz; u16 roff = le16_to_cpu(attr->nres.run_off);
+ if (roff > le32_to_cpu(attr->size)) { + err = -EINVAL; + goto out; + } + run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, evcn1 - 1, svcn, Add2Ptr(attr, roff), le32_to_cpu(attr->size) - roff); diff --git a/fs/ntfs3/attrlist.c b/fs/ntfs3/attrlist.c index bad6d8a849a2..c0c6bcbc8c05 100644 --- a/fs/ntfs3/attrlist.c +++ b/fs/ntfs3/attrlist.c @@ -68,6 +68,11 @@ int ntfs_load_attr_list(struct ntfs_inode *ni, struct ATTRIB *attr)
run_init(&ni->attr_list.run);
+ if (run_off > le32_to_cpu(attr->size)) { + err = -EINVAL; + goto out; + } + err = run_unpack_ex(&ni->attr_list.run, ni->mi.sbi, ni->mi.rno, 0, le64_to_cpu(attr->nres.evcn), 0, Add2Ptr(attr, run_off), diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c index 381a38a06ec2..b1b476fb7229 100644 --- a/fs/ntfs3/frecord.c +++ b/fs/ntfs3/frecord.c @@ -568,6 +568,12 @@ static int ni_repack(struct ntfs_inode *ni) }
roff = le16_to_cpu(attr->nres.run_off); + + if (roff > le32_to_cpu(attr->size)) { + err = -EINVAL; + break; + } + err = run_unpack(&run, sbi, ni->mi.rno, svcn, evcn, svcn, Add2Ptr(attr, roff), le32_to_cpu(attr->size) - roff); @@ -1589,6 +1595,9 @@ int ni_delete_all(struct ntfs_inode *ni) asize = le32_to_cpu(attr->size); roff = le16_to_cpu(attr->nres.run_off);
+ if (roff > asize) + return -EINVAL; + /* run==1 means unpack and deallocate. */ run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, evcn, svcn, Add2Ptr(attr, roff), asize - roff); @@ -2291,6 +2300,11 @@ int ni_decompress_file(struct ntfs_inode *ni) asize = le32_to_cpu(attr->size); roff = le16_to_cpu(attr->nres.run_off);
+ if (roff > asize) { + err = -EINVAL; + goto out; + } + /*run==1 Means unpack and deallocate. */ run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn, evcn, svcn, Add2Ptr(attr, roff), asize - roff); diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c index 0d611a6c5511..a85f5411aa74 100644 --- a/fs/ntfs3/fslog.c +++ b/fs/ntfs3/fslog.c @@ -2727,6 +2727,9 @@ static inline bool check_attr(const struct MFT_REC *rec, return false; }
+ if (run_off > asize) + return false; + if (run_unpack(NULL, sbi, 0, svcn, evcn, svcn, Add2Ptr(attr, run_off), asize - run_off) < 0) { return false; @@ -4771,6 +4774,12 @@ int log_replay(struct ntfs_inode *ni, bool *initialized) u16 roff = le16_to_cpu(attr->nres.run_off); CLST svcn = le64_to_cpu(attr->nres.svcn);
+ if (roff > t32) { + kfree(oa->attr); + oa->attr = NULL; + goto fake_attr; + } + err = run_unpack(&oa->run0, sbi, inode->i_ino, svcn, le64_to_cpu(attr->nres.evcn), svcn, Add2Ptr(attr, roff), t32 - roff); diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c index d5a3afbbbfd8..b0bc9dee2e2b 100644 --- a/fs/ntfs3/inode.c +++ b/fs/ntfs3/inode.c @@ -364,6 +364,11 @@ static struct inode *ntfs_read_mft(struct inode *inode, attr_unpack_run: roff = le16_to_cpu(attr->nres.run_off);
+ if (roff > asize) { + err = -EINVAL; + goto out; + } + t64 = le64_to_cpu(attr->nres.svcn); err = run_unpack_ex(run, sbi, ino, t64, le64_to_cpu(attr->nres.evcn), t64, Add2Ptr(attr, roff), asize - roff);