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If count = 0xFFFFFFFF, > integer overflow occurs. > > An attacker or local user could trigger a buffer overflow or integer > overflow by writing large amounts of data to the debugfs file. I re-ran this through Sashiko and it reported a few things: Sashiko: Is this description accurate? count is a size_t. Before the debugfs handler runs, vfs_write()->rw_verify_area() clamps it to MAX_RW_COUNT (INT_MAX & PAGE_MASK), so count + 1 cannot wrap on 32-bit or 64-bit. The allocation size (count + 1), the copy_from_user() length (count) and the cmd_buf[count] = '\0' terminator already match. A very large count only makes kzalloc() fail. This looks like hardening that caps the allocation size, not a fix for a vulnerability. Could the commit message say that? > Fix by adding validation: > if (count == 0 || count > PAGE_SIZE) return -EINVAL. > > PAGE_SIZE is chosen as a common limit for debugfs writes to prevent > excessive stack/heap allocation. > > Signed-off-by: Rifaldi Hormat > --- > drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c > index 0b52509cb14c..74e75504fdda 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_debugfs.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_debugfs.c > @@ -722,6 +722,8 @@ static ssize_t i40e_dbg_command_write(struct file *filp, > int cnt; > > /* don't allow partial writes */ > + if (count == 0 || count > PAGE_SIZE) > + return -EINVAL; Sashiko: This changes what userspace sees. A zero-length write used to return 0 and now returns -EINVAL. The check also runs before the *ppos != 0 test. A write at a nonzero offset that is empty or larger than PAGE_SIZE now gets -EINVAL instead of 0. Was this intended? If so, should the commit message mention it? Returning 0 for count == 0 would match normal write semantics. > if (*ppos != 0) > return 0; > > @@ -1605,6 +1607,8 @@ static ssize_t i40e_dbg_netdev_ops_write(struct file *filp, > int i, cnt; > > /* don't allow partial writes */ > + if (count == 0 || count > PAGE_SIZE) > + return -EINVAL; > if (*ppos != 0) > return 0; Sashiko: i40e_dbg_netdev_ops_write() has the same change: empty writes and writes at a nonzero offset now return -EINVAL instead of 0. Tony: For these last two, we should try to maintain existing behavior when possible and it seems to align with general expectations. Thanks, Tony