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| author | Dmitry Vyukov <dvyukov@google.com> | 2025-05-21 18:04:29 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-06-13 19:36:39 +0300 |
| commit | a2fc422ed75748eef2985454e97847fb22f873c2 (patch) | |
| tree | 811388d91b3d50b1b65b3b7230174de8a36448ce /tools/include | |
| parent | b89732c8c8357487185f260a723a060b3476144e (diff) | |
| download | linux-a2fc422ed75748eef2985454e97847fb22f873c2.tar.xz | |
syscall_user_dispatch: Add PR_SYS_DISPATCH_INCLUSIVE_ON
There are two possible scenarios for syscall filtering:
- having a trusted/allowed range of PCs, and intercepting everything else
- or the opposite: a single untrusted/intercepted range and allowing
everything else (this is relevant for any kind of sandboxing scenario,
or monitoring behavior of a single library)
The current API only allows the former use case due to allowed
range wrap-around check. Add PR_SYS_DISPATCH_INCLUSIVE_ON that
enables the second use case.
Add PR_SYS_DISPATCH_EXCLUSIVE_ON alias for PR_SYS_DISPATCH_ON
to make it clear how it's different from the new
PR_SYS_DISPATCH_INCLUSIVE_ON.
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/97947cc8e205ff49675826d7b0327ef2e2c66eea.1747839857.git.dvyukov@google.com
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/uapi/linux/prctl.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/prctl.h index 43dec6eed559..9785c1d49f05 100644 --- a/tools/include/uapi/linux/prctl.h +++ b/tools/include/uapi/linux/prctl.h @@ -255,7 +255,12 @@ struct prctl_mm_map { /* Dispatch syscalls to a userspace handler */ #define PR_SET_SYSCALL_USER_DISPATCH 59 # define PR_SYS_DISPATCH_OFF 0 -# define PR_SYS_DISPATCH_ON 1 +/* Enable dispatch except for the specified range */ +# define PR_SYS_DISPATCH_EXCLUSIVE_ON 1 +/* Enable dispatch for the specified range */ +# define PR_SYS_DISPATCH_INCLUSIVE_ON 2 +/* Legacy name for backwards compatibility */ +# define PR_SYS_DISPATCH_ON PR_SYS_DISPATCH_EXCLUSIVE_ON /* The control values for the user space selector when dispatch is enabled */ # define SYSCALL_DISPATCH_FILTER_ALLOW 0 # define SYSCALL_DISPATCH_FILTER_BLOCK 1 |