diff options
| author | Mickaël Salaün <mic@linux.microsoft.com> | 2021-03-05 14:49:06 +0100 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2021-03-05 18:12:06 +0100 |
| commit | 800618b02f4f840756eb4218603a313113f94f05 (patch) | |
| tree | 15f0a00c5ba18c431eb1906ad3c60a31dcb7628d /sys/linux | |
| parent | 7325cd4db12e532ea1ed4b021a03063f31fb740e (diff) | |
sys/linux: fix prctl variants
Because there is not a proper prctl syscall but only variants, it happens that
the logic to infer the number of syscall argument doesn't work (cf.
callArgSizes in pkg/compiler/gen.go). As a result, the kernel rejects multiple
prctl calls by returning -EINVAL because the fifth argument is not zero:
* PR_MCE_KILL
* PR_MCE_KILL_GET
* PR_SET_MM
* PR_SET_NO_NEW_PRIVS
* PR_GET_NO_NEW_PRIVS
* PR_GET_THP_DISABLE
* PR_SET_THP_DISABLE
* PR_GET_SPECULATION_CTRL
* PR_SET_SPECULATION_CTRL
Fix this by adding a new dummy prctl variant with all 5 arguments.
Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Diffstat (limited to 'sys/linux')
| -rw-r--r-- | sys/linux/prctl.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/linux/prctl.txt b/sys/linux/prctl.txt index 0ad8899c6..56bddb17b 100644 --- a/sys/linux/prctl.txt +++ b/sys/linux/prctl.txt @@ -9,6 +9,12 @@ include <uapi/linux/capability.h> include <uapi/linux/securebits.h> include <asm/prctl.h> +# Use this variant (which will always return -EINVAL) to explicitly set the 5 +# syscall arguments that will enable to properly infer callArgSizes for all +# prctl variants. + +prctl$0(option const[0], arg2 const[0], arg3 const[0], arg4 const[0], arg5 const[0]) (disabled) + # Only some commands break return values. # PR_GET_TIMERSLACK and maybe more produce random errno's. # When/if we have stricter enforcement of arguments for syscall variants, we may remove some of breaks_returns attributes. |