diff options
| author | wangzijie <wangzijie1@honor.com> | 2025-06-07 10:13:53 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-07-09 22:42:01 -0700 |
| commit | ff7ec8dc1b646296f8d94c39339e8d3833d16c05 (patch) | |
| tree | 3f0760e7cfaf35420dd9cbfea44c2f2299e6b4d0 /fs/proc/generic.c | |
| parent | a6fde7add78d122f5e09cb6280f99c4b5ead7d56 (diff) | |
proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al
Check pde->proc_ops->proc_lseek directly may cause UAF in rmmod scenario.
It's a gap in proc_reg_open() after commit 654b33ada4ab("proc: fix UAF in
proc_get_inode()"). Followed by AI Viro's suggestion, fix it in same
manner.
Link: https://lkml.kernel.org/r/20250607021353.1127963-1-wangzijie1@honor.com
Fixes: 3f61631d47f1 ("take care to handle NULL ->proc_lseek()")
Signed-off-by: wangzijie <wangzijie1@honor.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Cc: Kirill A. Shuemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/proc/generic.c')
| -rw-r--r-- | fs/proc/generic.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c index a3e22803cddf..e0e50914ab25 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -569,6 +569,8 @@ static void pde_set_flags(struct proc_dir_entry *pde) if (pde->proc_ops->proc_compat_ioctl) pde->flags |= PROC_ENTRY_proc_compat_ioctl; #endif + if (pde->proc_ops->proc_lseek) + pde->flags |= PROC_ENTRY_proc_lseek; } struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |