kernel: Fix compatibility with old and 32bit programs #2084
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hamjin
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In order to be compatible with these applications that do not upgrade to 64-bit, we have to intercept these system calls on the devices of most users who probably won't even use these applications, which is very frustrating. |
NetHunter Terminal is an 64bit app but using 32bit binaries. |
In v0.9.3 and v0.9.4, we replaced `vfs_statx` and `do_execveat_common` with syscall hooks. But we missed `fstatat64` and `compat_execve` and break compatibility with old and 32bit programs. In NetHunter Terminal compat_execve is directly called, but `fstatat64` is called before it in JuiceSSH bash-4.2. So add these two hooks back to fix them. Signed-off-by: hamjin <[email protected]>
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In v0.9.3 and v0.9.4, we replaced
vfs_statxanddo_execveat_commonwith syscall hooks. But we missedfstatat64andcompat_execveand break compatibility with old and 32bit programs.In one of the origin pull request(#1657), @tiann says "The compat_ series is not needed; because we don't support 32-bit ourselves; for the case of "kernel is 64-bit, but system is 32-bit", this situation did exist, but we have never provided a 32-bit manager, so it has never been supported, too." In fact, some 32bit binaries are still using compat syscalls to exec other programs.
In
kali(NetHunter Terminal)__arm64_compat_sys_execveis directly called, while__arm64_sys_fstatat64is called before it in JuiceSSHlibcom_sonelli_bash.so(32bit bash-4.2) like the strace in #1813.So add these two hooks back to fix them.
Fixes #2045, #1813