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linux-user: Disable more prctl subcodes 

Create a list of subcodes that we want to pass on, a list of
subcodes that should not be passed on because they would affect
the running qemu itself, and a list that probably could be
implemented but require extra work. Do not pass on unknown subcodes.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211227150127.2659293-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-12-27 07:01:23 -08:00 committed by Laurent Vivier
parent 87e9bf2323
commit 220717a6f4
1 changed files with 55 additions and 3 deletions
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58
linux-user/syscall.c
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@ -6337,6 +6337,13 @@ abi_long do_arch_prctl(CPUX86State *env, int code, abi_ulong addr)
# define PR_MTE_TAG_SHIFT 3
# define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)
#endif
#ifndef PR_SET_IO_FLUSHER
# define PR_SET_IO_FLUSHER 57
# define PR_GET_IO_FLUSHER 58
#endif
#ifndef PR_SET_SYSCALL_USER_DISPATCH
# define PR_SET_SYSCALL_USER_DISPATCH 59
#endif
#include "target_prctl.h"
@ -6433,13 +6440,58 @@ static abi_long do_prctl(CPUArchState *env, abi_long option, abi_long arg2,
return -TARGET_EINVAL;
}
return do_prctl_get_tagged_addr_ctrl(env);
case PR_GET_DUMPABLE:
case PR_SET_DUMPABLE:
case PR_GET_KEEPCAPS:
case PR_SET_KEEPCAPS:
case PR_GET_TIMING:
case PR_SET_TIMING:
case PR_GET_TIMERSLACK:
case PR_SET_TIMERSLACK:
case PR_MCE_KILL:
case PR_MCE_KILL_GET:
case PR_GET_NO_NEW_PRIVS:
case PR_SET_NO_NEW_PRIVS:
case PR_GET_IO_FLUSHER:
case PR_SET_IO_FLUSHER:
/* Some prctl options have no pointer arguments and we can pass on. */
return get_errno(prctl(option, arg2, arg3, arg4, arg5));
case PR_GET_CHILD_SUBREAPER:
case PR_SET_CHILD_SUBREAPER:
case PR_GET_SPECULATION_CTRL:
case PR_SET_SPECULATION_CTRL:
case PR_GET_TID_ADDRESS:
/* TODO */
return -TARGET_EINVAL;
case PR_GET_FPEXC:
case PR_SET_FPEXC:
/* Was used for SPE on PowerPC. */
return -TARGET_EINVAL;
case PR_GET_ENDIAN:
case PR_SET_ENDIAN:
case PR_GET_FPEMU:
case PR_SET_FPEMU:
case PR_SET_MM:
case PR_GET_SECCOMP:
case PR_SET_SECCOMP:
/* Disable seccomp to prevent the target disabling syscalls we need. */
case PR_SET_SYSCALL_USER_DISPATCH:
case PR_GET_THP_DISABLE:
case PR_SET_THP_DISABLE:
case PR_GET_TSC:
case PR_SET_TSC:
case PR_GET_UNALIGN:
case PR_SET_UNALIGN:
/* Disable to prevent the target disabling stuff we need. */
return -TARGET_EINVAL;
default:
/* Most prctl options have no pointer arguments */
return get_errno(prctl(option, arg2, arg3, arg4, arg5));
qemu_log_mask(LOG_UNIMP, "Unsupported prctl: " TARGET_ABI_FMT_ld "\n",
option);
return -TARGET_EINVAL;
}
}