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linux-user: fix readlinkat handling with magic exe symlink

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Exactly the same as f17f4989fa before was
for readlink. I suppose this was simply missed at the time.

Signed-off-by: Jameson Nash <vtjnash@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220808190727.875155-1-vtjnash@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Jameson Nash 2022-08-08 15:07:27 -04:00 committed by Laurent Vivier
parent d135f78140
commit 65d4830dac
1 changed files with 13 additions and 2 deletions
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15
linux-user/syscall.c
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@ -9912,11 +9912,22 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
p2 = lock_user(VERIFY_WRITE, arg3, arg4, 0);
if (!p || !p2) {
ret = -TARGET_EFAULT;
} else if (!arg4) {
/* Short circuit this for the magic exe check. */
ret = -TARGET_EINVAL;
} else if (is_proc_myself((const char *)p, "exe")) {
char real[PATH_MAX], *temp;
temp = realpath(exec_path, real);
ret = temp == NULL ? get_errno(-1) : strlen(real) ;
snprintf((char *)p2, arg4, "%s", real);
/* Return value is # of bytes that we wrote to the buffer. */
if (temp == NULL) {
ret = get_errno(-1);
} else {
/* Don't worry about sign mismatch as earlier mapping
* logic would have thrown a bad address error. */
ret = MIN(strlen(real), arg4);
/* We cannot NUL terminate the string. */
memcpy(p2, real, ret);
}
} else {
ret = get_errno(readlinkat(arg1, path(p), p2, arg4));
}