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Resolve relative argv0 for direct exec mode to absolute path for AT_EXECPATH.

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We know the binary relative name and can reliably calculate cwd path.
Because realpath(3) was already linked into ld-elf.so.1, reuse it
there to resolve dots and dotdots making the path more canonical.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D23014
This commit is contained in:
Konstantin Belousov 2020-01-09 10:00:24 +00:00
parent 7ba6c62fa0
commit f160596397
1 changed files with 32 additions and 4 deletions
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36
libexec/rtld-elf/rtld.c
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@ -5513,9 +5513,12 @@ static int
open_binary_fd(const char *argv0, bool search_in_path,
const char **binpath_res)
{
char *pathenv, *pe, *binpath;
char *abspath, *absres, *binpath, *pathenv, *pe, *res1;
const char *res;
int fd;
binpath = NULL;
res = NULL;
if (search_in_path && strchr(argv0, '/') == NULL) {
binpath = xmalloc(PATH_MAX);
pathenv = getenv("PATH");
@ -5540,21 +5543,46 @@ open_binary_fd(const char *argv0, bool search_in_path,
continue;
fd = open(binpath, O_RDONLY | O_CLOEXEC | O_VERIFY);
if (fd != -1 || errno != ENOENT) {
*binpath_res = binpath;
res = binpath;
break;
}
}
free(pathenv);
} else {
fd = open(argv0, O_RDONLY | O_CLOEXEC | O_VERIFY);
*binpath_res = argv0;
res = argv0;
}
/* XXXKIB Use getcwd() to resolve relative binpath to absolute. */
if (fd == -1) {
_rtld_error("Cannot open %s: %s", argv0, rtld_strerror(errno));
rtld_die();
}
if (res != NULL && res[0] != '/') {
abspath = getcwd(NULL, 0);
if (abspath != NULL) {
res1 = xmalloc(PATH_MAX);
if (realpath(res, res1) != NULL) {
if (res != argv0)
free(__DECONST(char *, res));
res = res1;
} else {
free(res1);
}
absres = xmalloc(strlen(abspath) +
strlen(res) + 2);
strcpy(absres, abspath);
strcat(absres, "/");
strcat(absres, res);
free(abspath);
if (res != argv0)
free(__DECONST(char *, res));
*binpath_res = absres;
} else {
*binpath_res = res;
}
} else {
*binpath_res = res;
}
return (fd);
}