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kernel: file_wrapper: copy mode of original inode

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Bionic uses fstat to determine whether an fd is a tty and set proper
buffering flags, so we also need to set the wrapper file's inode mode to
the original inode mode.

see:
https://cs.android.com/android/platform/superproject/main/+/main:bionic/libc/upstream-openbsd/lib/libc/stdio/makebuf.c;l=61-95;drc=9a4b68e20d617b2cb3355071521f16e8c3d538df
This commit is contained in:
5ec1cff
2025-11-15 19:52:05 +08:00
committed by ShirkNeko
parent 70f722e614
commit c61d6fb665
1 changed files with 2 additions and 0 deletions
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2
kernel/supercalls.c
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@@ -463,6 +463,8 @@ static int do_get_wrapper_fd(void __user *arg) {
struct file* pf = fget(ret); struct file* pf = fget(ret);
struct inode* wrapper_inode = file_inode(pf); struct inode* wrapper_inode = file_inode(pf);
// copy original inode mode
wrapper_inode->i_mode = file_inode(f)->i_mode;
struct inode_security_struct *sec = selinux_inode(wrapper_inode); struct inode_security_struct *sec = selinux_inode(wrapper_inode);
if (sec) { if (sec) {
sec->sid = ksu_file_sid; sec->sid = ksu_file_sid;