Commit Graph

802 Commits

Author SHA1 Message Date
Alejandro Colomar 379e9c32f7 lib/idmapping.c: Use long constants in prctl(2), and remove 0s
The prctl(2) system-call wrapper is implemented as a variadic function.
This makes it important to pass arguments to it of the right type (and
more importantly of the right width), to avoid undefined behavior.

While at it, check errors with ==-1, not <0, which is more explicit.

Also, PR_SET_KEEPCAPS(2const) doesn't need all arguments, so it can be
called with just two of them; remove unnecessary 0s.

See-also: prctl(2), PR_SET_KEEPCAPS(2const)
Link: <https://lore.kernel.org/linux-man/ddbdyaiptesjalgfmztxideej67e3yaob7ucsmbf6qvriwxiif@dohhxrqgwhrf/T/#med306b5b003f9cc7cc2de69fcdd7ee2d056d0954>
Cc: Xi Ruoyao <xry111@xry111.site>
Cc: Lukas Slebodnik <lslebodn@fedoraproject.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-02 13:12:22 -05:00
Alejandro Colomar 060b0849a6 lib/attr.h: Use C23-style attributes
They're stricter.  The GNU attributes are too lazy, and can be misused
more easily.  Also, mixing both has its own problems.

Link: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108796>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 4eed3e84a1 lib/gshadow.c: Use XREALLOC() instead of silently continuing on ENOMEM
We should do better, and correctly handle errors, since this is library
code.  However, I'm lazy right now, so let's die hard, and let us
improve this later.

Link: <https://github.com/shadow-maint/shadow/pull/991#discussion_r1660308154>
Reported-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar ba3a51e90f lib/: Use [[gnu::alloc_size(...)]] on allocation functions
Suggested-by: Martin Uecker <uecker@tugraz.at>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 5111e5ed1b lib/: Use multi-line macro definitions
This reduces the complexity of those nested parentheses.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 3049bef9c3 lib/alloc/, lib/, src/, tests/: Organize the allocation APIs in a new subdirectory
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 883bf71fc8 lib/alloc.[ch]: xmalloc(): Remove unused function
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 29f4f03def lib/string/strdup/xstrdup.[ch], lib/, src/: Move xstrdup() to its own file
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 2cf73c99a6 lib/string/strcpy/zustr2stp.[ch], tests/: Remove ZUSTR2STP()
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 103ffc5b1d lib/utmp.c: prepare_utmp(): Use xstrdup() instead of its pattern
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 3c09e40a1f lib/utmp.c: Use XSTRNDUP() instead of its pattern
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 2a0c0dd24b lib/string/strdup/: XSTRNDUP(), STRNDUPA(): Add macros
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 9a9faf86f0 lib/string/strcpy/strncat.[ch]: STRNCAT(): Add macro
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar d9923431eb src/: Use xasprintf() instead of its pattern
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar c287317075 lib/gshadow.c: build_list(): Fix REALLOC() nmemb calculation
Fixes: efbbcade43 ("Use safer allocation macros")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 056f1d03ee lib/gshadow.c: build_list(): Fix forever loop on ENOMEM
Before this patch, the function looped while (s != NULL && *s != '\0').
However, nothing was modifying that string if REALLOC() failed, so the
loop was forever.

Fixes: 8e167d28af ("[svn-upgrade] Integrating new upstream version, shadow (4.0.8)")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 16cb664865 lib/, src/: Use strsep(3) instead of its pattern
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 964df6ed6e lib/, src/: Use strchrnul(3) instead of its pattern
In the files where #include <string.h> is missing, add it, and sort the
includes.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 077f7b6ade lib/commonio.c: commonio_open(): MALLOC() and REALLOCF() already set ENOMEM
We don't need to set ENOMEM on failure of those functions.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar d611d1a947 lib/: Use REALLOCF() instead of its pattern
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar bdf00dca44 lib/failure.c: failprint(): Remove dead code
This should have gone into the #else'd branch in 8451bed8b0, and
should have been removed in 3e602b58a2.

Fixes: 8451bed8b0 ("[svn-upgrade] Integrating new upstream version, shadow (4.0.13)")
Fixes: 3e602b58a2 ("Remove HAVE_STRFTIME ifdefs")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar bfb6aad7cb lib/, src/: Always pass NULL to time(2)
See time(2):

BUGS
     Error returns from this system  call  are  indistinguishable  from
     successful  reports  that  the  time  is  a few seconds before the
     Epoch, so the C library wrapper function never sets errno as a re‐
     sult of this call.

     The tloc argument is obsolescent and should always be NULL in  new
     code.  When tloc is NULL, the call cannot fail.

Fixes: 45c6603cc8 ("[svn-upgrade] Integrating new upstream version, shadow (19990709)")
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 761eb07016 lib/getdate.y: NULL doesn't need a cast
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 2cb3deec72 lib/shadow.c: my_sgetspent(): Clarify that we're assigning an empty string
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 5e11e89fd9 lib/, src/: Reduce scope of local variables
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 40ab806066 lib/string/strcpy/, lib/, src/, tests/: Move all copying APIs to a subdirectory
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 22272347b6 lib/string/sprintf/, lib/, src/, tests/: Move all sprintf(3)-like APIs to a subdirectory
And have a separate file for each pair of APIs.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-07-01 21:40:11 -05:00
Alejandro Colomar 7f3ab84714 lib/limits.c: setrlimit_value(): Reimplement in terms of a2i()
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 7f86f893ab lib/, po/, src/: get_uid(): Move function to "atoi/getnum.h"
Implement it as an inline function, and add restrict and ATTR_STRING()
and ATTR_ACCESS() as appropriate.

Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 6093c93e81 lib/get_uid.c: get_uid(): Reimplement in terms of a2i()
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar b198c1e782 lib/get_pid.c: get_pidfd_from_fd(): Don't open-code get_fd()
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar a80715448b lib/atoi/getnum.[ch]: get_fd(): Add function for parsing a file descriptor from a string
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 1557fac0a5 lib/: get_pid(): Move function to "atoi/getnum.h"
Implement it as an inline function, and add restrict and ATTR_STRING()
and ATTR_ACCESS() as appropriate.

Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 6fd56468c3 lib/get_pid.c: get_pid(): Reimplement in terms of a2i()
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 509e3bcbf8 lib/: Don't open-code get_gid()
These functions were open-coding get_gid().  Use the actual function.

Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar f85a07f140 lib/, libsubid/, po/, src/: get_gid(): Move function to "atoi/getnum.h"
Implement it as an inline function, and add restrict and ATTR_STRING()
and ATTR_ACCESS() as appropriate.

Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 74a2ed4537 lib/get_gid.c: get_gid(): Reimplement in terms of a2i()
Reviewed-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Alejandro Colomar 500ec3f8f3 lib/typetraits.h: Add macros that give information about a type
In the case of is_unsigned() and is_signed(), the natural thing would be
to compare to 0:

	#define is_unsigned(x)  (((typeof(x)) -1) > 0)
	#define is_signed(x)    (((typeof(x)) -1) < 0)

However, that would trigger -Wtype-limits, so we compare against 1,
which silences that, and does the same job.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-29 20:00:18 +02:00
Serge Hallyn 75ea679799 have_range: open the subid db if needed
When we run for instance

  check_subid_range ubuntu u 100000 65536

when ubuntu user is defined and has that range, it returns no entries
because the subid db is not opened.  Open it in have_range if needed.

I haven't figured out why this ever worked.

Signed-off-by: Serge Hallyn <serge@hallyn.com>
2024-06-28 16:16:33 +02:00
Alejandro Colomar 47edcd3045 lib/csrand.c: Fix the lower part of the domain of csrand_uniform()
I accidentally broke this code during an un-optimization.  We need to
start from a random value of the width of the limit, that is, 32 bits.

Thanks to Jason for pointing to his similar code in the kernel, which
made me see my mistake.

Fixes: 2a61122b5e ("Unoptimize the higher part of the domain of csrand_uniform()")
Closes: <https://github.com/shadow-maint/shadow/issues/1015>
Reported-by: Michael Brunnbauer <https://github.com/michaelbrunnbauer>
Link: <https://git.zx2c4.com/linux-rng/tree/drivers/char/random.c#n535>
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Link: <https://github.com/shadow-maint/shadow/pull/638>
Link: <https://github.com/shadow-maint/shadow/issues/634>
Link: <https://github.com/shadow-maint/shadow/pull/624>
Tested-by: Michael Brunnbauer <https://github.com/michaelbrunnbauer>
Reviewed-by: Michael Brunnbauer <https://github.com/michaelbrunnbauer>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-20 21:38:58 -05:00
Alejandro Colomar ca046af5d9 Remove support for rlogind in login(1), that is, remove the '-r' flag
The "quick hack" finally disappeared.  Probably nobody noticed.  ;)
(See the changes in <configure.ac> for the context of this pun.)

Probably everybody uses SSH these days for remote login.  Let's remove
this insecure method.

Closes: <https://github.com/shadow-maint/shadow/issues/992>
Reviewed-by: dkwo <nicolopiazzalunga@gmail.com>
Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Michael Vetter <jubalh@iodoru.org>
Cc: Sam James <sam@gentoo.org>
Cc: Benedikt Brinkmann <datacobra@thinkbot.de>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-13 19:39:26 -05:00
Daniel Bershatsky df59088641 libsubid: Fix code style issues 2024-06-12 21:45:31 +02:00
Daniel Bershatsky b620b5d0d1 libsubid: Fail on plugin loading if no subid_free provided 2024-06-12 21:45:31 +02:00
Daniel Bershatsky 29dbcfbabd libsubid: Apply minor fixes 2024-06-12 21:45:31 +02:00
Daniel Bershatsky 0217516349 libsubid: Add routine to free allocated memory 2024-06-12 21:45:31 +02:00
Alejandro Colomar 69f74dbf8a lib/cast.h: const_cast(): Reimplement with _Generic(3)
This makes it much simpler and portable.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-06-04 09:10:23 +02:00
Alejandro Colomar 71e28359d1 lib/atoi/strtou_noneg.[ch], tests/: strtoul_noneg(): Remove unused function
All call sites have been replaced by functions from "atoi/a2i.h" and
"atoi/str2i.h" recently.

Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-05-27 16:32:09 +02:00
Alejandro Colomar fb49de61b7 lib/atoi/strtou_noneg.[ch], tests/: strtoull_noneg(): Remove unused function
All call sites were replaced by a2i() recently.

Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-05-27 16:32:09 +02:00
Alejandro Colomar 895dfd77d2 lib/gettime.c: gettime(): Call a2i() instead of strtoull_noneg()
time_t isn't necessarily unsigned (in fact, it's likely to be signed.
Therefore, parse the number as the right type, via a2i(time_t, ...).

Still, reject negative numbers, just to be cautious.  It was done
before (strtoull_noneg()), so it shouldn't be a problem.  (However,
strtoull_noneg() was only introduced recently, and before that we called
strtoull(3), which silently accepted negative values.)

Remove the limitation of ULONG_MAX, which seems arbitrary.  It probably
was written in times where 'time_t' had the same length of 'long', and
this was thus a test that the value didn't overflow 'time_t'.  Such a
test is implicit in the a2i() call, so forget about it.

Unify the error messages into a single one that provides all the info
(except the value of 'fallback').

Link: <https://github.com/shadow-maint/shadow/commit/cb610d54b47ea2fc3da5a1b7c5a71274ada91371#r136407772>
Reviewed-by: Iker Pedrosa <ipedrosa@redhat.com>
Cc: Chris Lamb <lamby@debian.org>
Cc: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-05-27 16:32:09 +02:00
Alejandro Colomar 99df9d746e lib/chkname.[ch]: login_name_max_size(): Add function
It encapsulates some logic that we may want to reuse elsewhere.

Link: <https://github.com/shadow-maint/shadow/pull/989>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-05-21 13:26:41 +02:00