kernel/linux.git/tools/testing, branch v6.12.103

selftests/clone3: fix wild pointer access of getline due to missing init

2026-08-09T18:23:15+00:00

commit 8f6f9fd93cd7a5dd607ad5cd910476dd68fff3ed upstream. Patch series "selftests: Add missing initalization of pointer passed to getline", v2. This patch (of 2): Clone3_set_tid uses getline(&line, ...) in a loop to read the child's process status. The code expects that getline allocates the buffer for the line on the first loop iteration. According to the Open Group Spec[1], char *line has to be null pointer for this: > ssize_t getline(char **restrict lineptr, ...); > If *lineptr is a null pointer or if the object pointed to by *lineptr > is of insufficient size, an object shall be allocated as if by malloc() > or the object shall be reallocated as if by realloc()[...]. However, char *line is only declared, leading to an undefined value that is potentially non-null. In an example run with Musl v1.2.6, the realloc call[2] of getdelim, which implements getline, triggers a segfault: ./run_kselftest.sh --test clone3:clone3_set_tid [ 1366.165898] kselftest: Running tests in clone3 ... [ 1367.799244] clone3_set_tid[811]: unhandled signal 11 code 0x1 at 0x0000000000000000 in libc.so[68184,3fbf69f000+4c000] [ 1367.802808] CPU: 0 UID: 0 PID: 811 Comm: clone3_set_tid Not tainted .. [ 1367.804188] epc: 0x0000003fbf6b0184 [ 1367.804188] ra : 0x0000003fbf6d4664 [ 1367.804188] sp : 0x0000003fce5f2e40 [ 1367.805314] gp : 0x0000002aaab0dfb8 [ 1367.805314] tp : 0x0000003fbf6f14a8 [ 1367.805314] t0 : 0x0000003fbf63d000 ... Looking at the realloc implementation, Musl mallocs for a null pointer memory. But for a non-null pointer, it assumes it's passed a valid pointer to the heap and tries to access its meta-data. This leads to the segfault we see: void *realloc(void *p, size_t n) { if (!p) return malloc(n); if (size_overflows(n)) return 0; struct meta *g = get_meta(p); ... } Fix this by properly initializing the line pointer to NULL. Link: https://lore.kernel.org/20260722130246.2135563-1-christian.gellermann@codasip.com Link: https://lore.kernel.org/20260722130246.2135563-2-christian.gellermann@codasip.com Link: https://pubs.opengroup.org/onlinepubs/9799919799/functions/getline.html [1] Link: https://git.musl-libc.org/cgit/musl/tree/src/stdio/getdelim.c#n38 [2] Fixes: 41585bbeeef9 ("selftests: add tests for clone3() with *set_tid") Signed-off-by: Chris Gellermann Acked-by: David Hildenbrand (arm) Reviewed-by: Lorenzo Stoakes Cc: Christian Brauner Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman

selftests/mm: fix potential wild pointer access of getline due to missing init

2026-08-09T18:23:15+00:00

commit 9f1d75a4ce04095afdb63d8e540092ff8151dacf upstream. This is another occurrence of using getline where the code assumes that getline allocates memory to store the line, but the pointer passed to it is uninitialized and potentially a non-null pointer. This violates the Open Group Spec[1] and caused a segfault in a similar situation in selftest/clone3/clone3_set_tid. Fix it by initializing the line pointer to NULL. The issue has been found by simply grepping through the selftest code after running into the issue in clone3_set_tid. Whether it segfaults in its current state is unknown to me. But it's good to be addressed due to defensive reasons. Link: https://lore.kernel.org/20260722130246.2135563-3-christian.gellermann@codasip.com Link: https://pubs.opengroup.org/onlinepubs/9799919799/functions/getline.html [1] Fixes: 26b4224d9961 ("selftests: expanding more mlock selftest") Signed-off-by: Chris Gellermann Acked-by: David Hildenbrand (arm) Reviewed-by: Lorenzo Stoakes Cc: Christian Brauner Cc: Liam R. Howlett Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman

kunit: tool: skip stty when stdin is not a tty

2026-08-09T18:23:00+00:00

commit e42c349f4cdfa43cb39a68c8f764f8cafc23a9a9 upstream. run_kernel() cleanup and signal_handler() invoke stty unconditionally. When stdin is not a tty (for example in CI or unit tests), this writes noise to stderr. Call stty only when stdin is a tty. Add regression tests for these paths: - run_kernel() with non-tty stdin - signal_handler() with non-tty stdin - signal_handler() with tty stdin Signed-off-by: Shuvam Pandey Reviewed-by: David Gow Signed-off-by: Shuah Khan [florian: add missing 'import sys' required by sys.stdin.isatty(); the module was already present in the mainline tree before this commit but was absent from the 6.12 base of kunit_kernel.py] Signed-off-by: Florian Fainelli Signed-off-by: Sasha Levin

kunit: tool: Terminate kernel under test on SIGINT

2026-08-09T18:23:00+00:00

commit 8f260b02eeeffbf2263c2b82b6e3e32fd73cde2b upstream. kunit.py will attempt to catch SIGINT / ^C in order to ensure the TTY isn't messed up, but never actually attempts to terminate the running kernel (be it UML or QEMU). This can lead to a bit of frustration if the kernel has crashed or hung. Terminate the kernel process in the signal handler, if it's running. This requires plumbing through the process handle in a few more places (and having some checks to see if the kernel is still running in places where it may have already been killed). Reported-by: Andy Shevchenko Closes: https://lore.kernel.org/all/aaFmiAmg9S18EANA@smile.fi.intel.com/ Signed-off-by: David Gow Reviewed-by: Andy Shevchenko Tested-by: Andy Shevchenko Signed-off-by: Shuah Khan [florian: resolved conflict in signal_handler(): upstream references _restore_terminal_if_tty() which is introduced by the following commit; retained subprocess.call(['stty', 'sane']) until that helper is available] Signed-off-by: Florian Fainelli Signed-off-by: Sasha Levin

selftests: openvswitch: add config file

2026-08-03T09:17:12+00:00

[ Upstream commit 441a820ccef9af80a9ac5a4c85b9c396e595967c ] The kselftests doc mentions that a config file should be present "if a test needs specific kernel config options enabled". This selftest requires some kernel config, but no config file was provided. We could say that a sub-target could use the parent's config file, but the kselftests doc doesn't mention anything about that. Plus the net/openvswitch target is the only net target without a config file. Here is a new config file, which is a trimmed version of the net one, with hopefully the minimal required kconfig on top of 'make defconfig'. The Fixes tag points to the introduction of the net/openvswitch target, just to help validating this target on stable kernels. Fixes: 25f16c873fb1 ("selftests: add openvswitch selftest suite") Signed-off-by: Matthieu Baerts (NGI0) Reviewed-by: Eelco Chaudron Link: https://patch.msgid.link/20260710-net-sft-fix-containers-v1-2-a2915c294ef5@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

selftests: af_unix: add USER_NS config

2026-08-03T09:17:12+00:00

[ Upstream commit f8b1abed736111f914b2c567d9a3db1f71e788e8 ] This is required to use unshare(CLONE_NEWUSER). This has not been seen on NIPA before, because the 'af_unix' tests are executed with the 'net' ones, merging their config files. USER_NS is present in tools/testing/selftests/net/config. This issue is visible when only the af_unix config is used on top of the default one. This is the recommended way to execute selftest targets. Fixes: ac011361bd4f ("af_unix: Add test for sock_diag and UDIAG_SHOW_UID.") Signed-off-by: Matthieu Baerts (NGI0) Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260710-net-sft-fix-containers-v1-1-a2915c294ef5@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

selftests/alsa: Fix memory leak in find_controls error path

2026-08-03T09:17:01+00:00

[ Upstream commit cb89f0c1aed02eb233c4271f76f830b37e222ff6 ] In find_controls(), card_data is allocated with malloc() but when snd_ctl_open_lconf() fails, the code jumps to next_card without freeing the allocated memory. This results in a memory leak for each card where snd_ctl_open_lconf() fails. Add free(card_data) before goto next_card to ensure proper cleanup of the allocated memory in the error path. Fixes: 5aaf9efffc57 ("kselftest: alsa: Add simplistic test for ALSA mixer controls kselftest") Signed-off-by: Malaya Kumar Rout Link: https://patch.msgid.link/20260704105736.94874-1-malayarout91@gmail.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin

selftests/bpf: Add tests for ld_{abs,ind} failure path in subprogs

2026-08-03T09:16:58+00:00

commit e0fcb42bc6f41bab2895757d6610616b3820eff7 upstream. Extend the verifier_ld_ind BPF selftests with subprogs containing ld_{abs,ind} and craft the test in a way where the invalid register read is rejected in the fixed case. Also add a success case each, and add additional coverage related to the BTF return type enforcement. # LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t verifier_ld_ind [...] #611/1 verifier_ld_ind/ld_ind: check calling conv, r1:OK #611/2 verifier_ld_ind/ld_ind: check calling conv, r1 @unpriv:OK #611/3 verifier_ld_ind/ld_ind: check calling conv, r2:OK #611/4 verifier_ld_ind/ld_ind: check calling conv, r2 @unpriv:OK #611/5 verifier_ld_ind/ld_ind: check calling conv, r3:OK #611/6 verifier_ld_ind/ld_ind: check calling conv, r3 @unpriv:OK #611/7 verifier_ld_ind/ld_ind: check calling conv, r4:OK #611/8 verifier_ld_ind/ld_ind: check calling conv, r4 @unpriv:OK #611/9 verifier_ld_ind/ld_ind: check calling conv, r5:OK #611/10 verifier_ld_ind/ld_ind: check calling conv, r5 @unpriv:OK #611/11 verifier_ld_ind/ld_ind: check calling conv, r7:OK #611/12 verifier_ld_ind/ld_ind: check calling conv, r7 @unpriv:OK #611/13 verifier_ld_ind/ld_abs: subprog early exit on ld_abs failure:OK #611/14 verifier_ld_ind/ld_ind: subprog early exit on ld_ind failure:OK #611/15 verifier_ld_ind/ld_abs: subprog with both paths safe:OK #611/16 verifier_ld_ind/ld_ind: subprog with both paths safe:OK #611/17 verifier_ld_ind/ld_abs: reject void return subprog:OK #611/18 verifier_ld_ind/ld_ind: reject void return subprog:OK #611 verifier_ld_ind:OK Summary: 1/18 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/r/20260408191242.526279-4-daniel@iogearbox.net Signed-off-by: Alexei Starovoitov Signed-off-by: Philo Lu Signed-off-by: Sasha Levin

selftests/bpf: Add simple strscpy() implementation

2026-07-24T14:11:57+00:00

commit 63c49efc987afefc6b9bb7de083eb8748e0b1789 upstream. Replace bpf_strlcpy() in bpf_util.h with a sized_strscpy(), which is a simplified sized_strscpy() from the kernel (lib/string.c [1]). It: * takes a count (destination size) parameter * guarantees NULL-termination * returns the number of characters copied or -E2BIG Re-define strscpy macro similar to in-kernel implementation [2]: allow the count parameter to be optional. Add #ifdef-s to tools/include/linux/args.h, as they may be defined in other system headers (for example, __CONCAT in sys/cdefs.h). Fixup the single existing bpf_strlcpy() call in cgroup_helpers.c [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/string.c?h=v6.19#n113 [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/string.h?h=v6.19#n91 Signed-off-by: Ihor Solodrai Link: https://lore.kernel.org/r/20260223190736.649171-2-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov Stable-dep-of: 55ffbe8a15b1 ("selftests/bpf: Initialize operation name before use") Closes: https://lore.kernel.org/stable/al8dSv_OvhwxFCar@u94a Signed-off-by: Shung-Hsi Yu Signed-off-by: Greg Kroah-Hartman

tools/testing: add linux/args.h header and fix radix, VMA tests

2026-07-24T14:11:56+00:00

commit 9a6a6a3191574a01dcf7a7d9385246d7bc8736bc upstream. Commit 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") accidentally broke the radix tree, VMA userland tests by including linux/args.h which is not present in the tools/include directory. This patch copies this over and adds an #ifdef block to avoid duplicate __CONCAT declaration in conflict with system headers when we ultimately include this. Link: https://lkml.kernel.org/r/20250811052654.33286-1-lorenzo.stoakes@oracle.com Fixes: 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") Signed-off-by: Lorenzo Stoakes Cc: Jann Horn Cc: John Hubbard Cc: Liam Howlett Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Dan Williams Cc: Peter Zijlstra Signed-off-by: Andrew Morton Stable-dep-of: 63c49efc987a ("selftests/bpf: Add simple strscpy() implementation") Signed-off-by: Shung-Hsi Yu Signed-off-by: Greg Kroah-Hartman