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Correct crash in child processes under armeabi Android

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* exec/trace.c (process_system_call) <READLINKAT_SYSCALL>:
Examine tracee->waiting_for_syscall and avoid rewriting user
arguments if a system call is presently being executed by the
kernel.  Reported by Romário Rios <romariorios@protonmail.com>.
This commit is contained in:
Po Lu 2023-09-18 14:13:30 +08:00
parent b892da5f61
commit cd69120731
1 changed files with 14 additions and 8 deletions
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22
exec/trace.c
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@ -1039,16 +1039,22 @@ process_system_call (struct exec_tracee *tracee)
#endif /* READLINK_SYSCALL */
case READLINKAT_SYSCALL:
/* Handle this readlinkat system call. */
rc = handle_readlinkat (callno, &regs, tracee,
&result);
/* This system call is already in progress if
TRACEE->waiting_for_syscall is true. */
/* rc means the same as in `handle_exec'. */
if (!tracee->waiting_for_syscall)
{
/* Handle this readlinkat system call. */
rc = handle_readlinkat (callno, &regs, tracee,
&result);
if (rc == 1)
goto report_syscall_error;
else if (rc == 2)
goto emulate_syscall;
/* rc means the same as in `handle_exec'. */
if (rc == 1)
goto report_syscall_error;
else if (rc == 2)
goto emulate_syscall;
}
/* Fallthrough. */