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#1 2025-11-23 18:49:58

Samueru
Member
Registered: 2023-07-03
Posts: 41

`file` breaks when `GCONV_PATH` is set

GCONV_PATH=/usr/lib/gconv file /bin/bash
zsh: invalid system call  GCONV_PATH=/usr/lib/gconv file /bin/bash
echo $?
159
GCONV_PATH=/ file /bin/bash
zsh: invalid system call  GCONV_PATH=/usr/lib/gconv file /bin/bash
echo $?
159

Doesn't matter if `GCONV_PATH` points to a valid location, it fails anyway.

This does not happen in ubuntu24 regardless if `GCONV_PATH` points to a valid location.

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#2 2025-11-24 00:07:52

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,608
Website

Re: `file` breaks when `GCONV_PATH` is set

https://gitlab.archlinux.org/archlinux/ … e/-/issues

PGP Key: F99FFE0FEAE999BD | I develop pacman - buy me a drink!

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#3 2025-11-24 00:27:14

loqs
Member
Registered: 2014-03-06
Posts: 18,691

Re: `file` breaks when `GCONV_PATH` is set

Allan wrote:

Or glibc if thats where the the backtrace leads as the backtrace leads to https://github.com/file/file/blob/FILE5 … ile.c#L674.

bt full
#0  __GI___getcwd (buf=buf@entry=0x0, size=size@entry=0) at ../sysdeps/unix/sysv/linux/getcwd.c:80
        sc_ret = 79
        path = 0x5fec30ac1800 "@\321\347\257\347y"
        result = <optimized out>
        alloc_size = <optimized out>
        retval = <optimized out>
        __PRETTY_FUNCTION__ = "__getcwd"
#1  0x000079e7afc9d78b in __gconv_get_path () at gconv_conf.c:394
        user_len = <optimized out>
        result = 0x0
        __PRETTY_FUNCTION__ = "__gconv_get_path"
        gconv_path = 0x7ffc3b66e460 "/usr/lib/gconv:/usr/lib/gconv"
        gconv_path_len = <optimized out>
        elem = <optimized out>
        oldp = <optimized out>
        cp = <optimized out>
        nelems = <optimized out>
        cwd = <optimized out>
        cwdlen = <optimized out>
#2  0x000079e7afc9e445 in __gconv_read_conf () at gconv_conf.c:477
        save_errno = 2
        cnt = <optimized out>
        cp = <optimized out>
#3  0x000079e7afd0fe74 in __pthread_once_slow (once_control=0x79e7afe7d72c <once>, init_routine=0x79e7afc9e3d0 <__gconv_read_conf>) at pthread_once.c:116
        __cancel_routine = 0x79e7afd0fd30 <clear_once_control>
        __clframe = {__cancel_routine = 0x79e7afd0fd30 <clear_once_control>, __cancel_arg = 0x79e7afe7d72c <once>, __do_it = 1, __buffer = {
            __routine = 0x79e7afd0fcf0 <__pthread_cleanup_combined_routine_voidptr>, __arg = 0x7ffc3b66e620, __canceltype = 0, __prev = 0x0}}
        val = <optimized out>
        newval = <optimized out>
#4  0x000079e7afd0fee9 in ___pthread_once (once_control=once_control@entry=0x79e7afe7d72c <once>, init_routine=init_routine@entry=0x79e7afc9e3d0 <__gconv_read_conf>) at pthread_once.c:143
        val = <optimized out>
#5  0x000079e7afc9e747 in __gconv_load_conf () at gconv_conf.c:528
No locals.
#6  0x000079e7afc9d2c6 in __gconv_find_transform (toset=toset@entry=0x79e7afe238c8 "INTERNAL", fromset=fromset@entry=0x7ffc3b66e700 "UTF-8//", handle=handle@entry=0x7ffc3b66e720, 
    nsteps=nsteps@entry=0x7ffc3b66e718, flags=flags@entry=0) at gconv_db.c:712
        fromset_expand = <optimized out>
        toset_expand = <optimized out>
        result = <optimized out>
#7  0x000079e7afd37d21 in __wcsmbs_getfct (to=0x79e7afe238c8 "INTERNAL", from=0x7ffc3b66e700 "UTF-8//", nstepsp=0x5fec30abc538) at wcsmbsload.c:91
        nsteps = 105468033509472
        result = 0x1
#8  __wcsmbs_load_conv (new_category=<optimized out>) at wcsmbsload.c:187
        charset_name = <optimized out>
        complete_name = 0x7ffc3b66e700 "UTF-8//"
        new_fcts = 0x5fec30abc530
        use_translit = <optimized out>
        data = 0x5fec30abb6b0
#9  0x000079e7afd35c75 in get_gconv_fcts (data=<optimized out>) at ./wcsmbsload.h:71
        private = 0x5fec30abb6b0
#10 __GI___mbrtowc (pwc=pwc@entry=0x7ffc3b66e84c L"忬", s=<optimized out>, s@entry=0x7ffc3b670a82 "/bin/bash", n=<optimized out>, n@entry=9, ps=ps@entry=0x7ffc3b66e850) at mbrtowc.c:69
        buf = L"忬"
--Type <RET> for more, q to quit, c to continue without paging--
        data = {__outbuf = 0x7ffc3b66e84c "\354_", __outbufend = 0x7ffc3b66e850 "", __flags = 1, __invocation_counter = 0, __internal_use = 1, __statep = 0x7ffc3b66e850, __state = {
            __count = 0, __value = {__wch = 0, __wchb = "\000\000\000"}}}
        status = <optimized out>
        result = <optimized out>
        dummy = 134033044406275
        inbuf = 0xf0 <error: Cannot access memory at address 0xf0>
        endbuf = <optimized out>
        outbuf = <optimized out>
        fcts = <optimized out>
        fct = <optimized out>
        __PRETTY_FUNCTION__ = "__mbrtowc"
#11 0x00005febf2cd7996 in file_mbswidth (ms=ms@entry=0x5fec30abc560, s=0x7ffc3b670a82 "/bin/bash") at /usr/src/debug/file/file/src/file.c:674
        width = 0
        bytesconsumed = <optimized out>
        n = 9
        state = {__count = 0, __value = {__wch = 0, __wchb = "\000\000\000"}}
        nextchar = 24556 L'忬'
#12 0x00005febf2cd6fdc in main (argc=2, argv=0x7ffc3b66eaa8) at /usr/src/debug/file/file/src/file.c:428
        c = <optimized out>
        i = <optimized out>
        j = 1
        wid = 0
        nw = <optimized out>
        action = 0
        didsomefiles = 0
        errflg = 0
        flags = 67108864
        e = 0
        sandbox = <optimized out>
        magic = 0x5fec30abc560
        longindex = 0
        magicfile = 0x0
        progname = <optimized out>

Edit:
Debian/Ubuntu disable files seccomp sandbox which does not allow getcwd https://github.com/file/file/blob/maste … omp.c#L103.  Apologies to Allan.

Last edited by loqs (2025-11-24 01:05:41)

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#4 2025-11-24 01:46:14

Allan
Pacman
From: Brisbane, AU
Registered: 2007-06-09
Posts: 11,608
Website

Re: `file` breaks when `GCONV_PATH` is set

Running file with the -S flag confirms it is the sandbox.

PGP Key: F99FFE0FEAE999BD | I develop pacman - buy me a drink!

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#5 2025-11-24 14:24:36

loqs
Member
Registered: 2014-03-06
Posts: 18,691

Re: `file` breaks when `GCONV_PATH` is set

Patch for file's seccomp sandbox to allow getgwd:

diff --git a/src/seccomp.c b/src/seccomp.c
index ce824330..916efe5f 100644
--- a/src/seccomp.c
+++ b/src/seccomp.c
@@ -99,6 +99,7 @@ enable_sandbox(void)
 	ALLOW_RULE(fstatat64);
 #endif
 	ALLOW_RULE(futex);
+	ALLOW_RULE(getcwd);
 	ALLOW_RULE(getdents);
 #ifdef __NR_getdents64
 	ALLOW_RULE(getdents64);

Edit:
@Samueru please report the issue on https://bugs.astron.com/my_view_page.php if it has no been already.

Last edited by loqs (2025-11-24 20:54:45)

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#6 2025-11-26 20:15:04

Samueru
Member
Registered: 2023-07-03
Posts: 41

Re: `file` breaks when `GCONV_PATH` is set

Alright will report to upstream directly, it's a shame though given that it can take years for file to make a new stable release.

Btw I found that if I set `LC_ALL=C` this fixes the crash when GCONV_PATH is set, so I guess I will be doing this in the long meantime.

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#7 2025-11-26 20:54:20

loqs
Member
Registered: 2014-03-06
Posts: 18,691

Re: `file` breaks when `GCONV_PATH` is set

Arch is already carrying a patch for file's seccomp sandbox so I suspect the package maintainers will accept a merge request adding a patch for this issue once upstream has accepted it without needing to wait for a new upstream release.

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