- 12 Aug, 2020 40 commits
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Tiezhu Yang authored
The return value of oops_may_print() is true or false, so change its type to reflect that. Signed-off-by:
Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Reviewed-by:
Kees Cook <keescook@chromium.org> Cc: Xuefeng Li <lixuefeng@loongson.cn> Link: http://lkml.kernel.org/r/1591103358-32087-1-git-send-email-yangtiezhu@loongson.cnSigned-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Gustavo A. R. Silva authored
Use array_size() helper instead of the open-coded version in copy_{from,to}_user(). These sorts of multiplication factors need to be wrapped in array_size(). This issue was found with the help of Coccinelle and, audited and fixed manually. Signed-off-by:Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by:
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Gustavo A. R. Silva authored
Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes. Also, while there, use the preferred form for passing a size of a struct. The alternative form where struct name is spelled out hurts readability and introduces an opportunity for a bug when the pointer variable type is changed but the corresponding sizeof that is passed as argument is not. This issue was found with the help of Coccinelle and, audited and fixed manually. Addresses KSPP ID: https://github.com/KSPP/linux/issues/83Signed-off-by:
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Gustavo A. R. Silva authored
Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes. This issue was found with the help of Coccinelle and, audited and fixed manually. Addresses KSPP ID: https://github.com/KSPP/linux/issues/83Signed-off-by:
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Vijay Balakrishna authored
Make kernel GNU build-id available in VMCOREINFO. Having build-id in VMCOREINFO facilitates presenting appropriate kernel namelist image with debug information file to kernel crash dump analysis tools. Currently VMCOREINFO lacks uniquely identifiable key for crash analysis automation. Regarding if this patch is necessary or matching of linux_banner and OSRELEASE in VMCOREINFO employed by crash(8) meets the need -- IMO, build-id approach more foolproof, in most instances it is a cryptographic hash generated using internal code/ELF bits unlike kernel version string upon which linux_banner is based that is external to the code. I feel each is intended for a different purpose. Also OSRELEASE is not suitable when two different kernel builds from same version with different features enabled. Currently for most linux (and non-linux) systems build-id can be extracted using standard methods for file types such as user mode crash dumps, shared libraries, loadable kernel modules etc., This is an exception for linux kernel dump. Having build-id in VMCOREINFO brings some uniformity for automation tools. Tyler said: : I think this is a nice improvement over today's linux_banner approach for : correlating vmlinux to a kernel dump. : : The elf notes parsing in this patch lines up with what is described in in : the "Notes (Nhdr)" section of the elf(5) man page. : : BUILD_ID_MAX is sufficient to hold a sha1 build-id, which is the default : build-id type today in GNU ld(2). It is also sufficient to hold the : "fast" build-id, which is the default build-id type today in LLVM lld(2). Signed-off-by:
Vijay Balakrishna <vijayb@linux.microsoft.com> Signed-off-by:
Tyler Hicks <tyhicks@linux.microsoft.com> Acked-by:
Baoquan He <bhe@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Link: http://lkml.kernel.org/r/1591849672-34104-1-git-send-email-vijayb@linux.microsoft.comSigned-off-by:
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Kees Cook authored
The path_noexec() check, like the regular file check, was happening too late, letting LSMs see impossible execve()s. Check it earlier as well in may_open() and collect the redundant fs/exec.c path_noexec() test under the same robustness comment as the S_ISREG() check. My notes on the call path, and related arguments, checks, etc: do_open_execat() struct open_flags open_exec_flags = { .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, .acc_mode = MAY_EXEC, ... do_filp_open(dfd, filename, open_flags) path_openat(nameidata, open_flags, flags) file = alloc_empty_file(open_flags, current_cred()); do_open(nameidata, file, open_flags) may_open(path, acc_mode, open_flag) /* new location of MAY_EXEC vs path_noexec() test */ inode_permission(inode, MAY_OPEN | acc_mode) security_inode_permission(inode, acc_mode) vfs_open(path, file) do_dentry_open(file, path->dentry->d_inode, open) security_file_open(f) open() /* old location of path_noexec() test */ Signed-off-by: -
Kees Cook authored
The execve(2)/uselib(2) syscalls have always rejected non-regular files. Recently, it was noticed that a deadlock was introduced when trying to execute pipes, as the S_ISREG() test was happening too late. This was fixed in commit 73601ea5 ("fs/open.c: allow opening only regular files during execve()"), but it was added after inode_permission() had already run, which meant LSMs could see bogus attempts to execute non-regular files. Move the test into the other inode type checks (which already look for other pathological conditions[1]). Since there is no need to use FMODE_EXEC while we still have access to "acc_mode", also switch the test to MAY_EXEC. Also include a comment with the redundant S_ISREG() checks at the end of execve(2)/uselib(2) to note that they are present to avoid any mistakes. My notes on the call path, and related arguments, checks, etc: do_open_execat() struct open_flags open_exec_flags = { .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC, .acc_mode = MAY_EXEC, ... do_filp_open(dfd, filename, open_flags) path_openat(nameidata, open_flags, flags) file = alloc_empty_file(open_flags, current_cred()); do_open(nameidata, file, open_flags) may_open(path, acc_mode, open_flag) /* new location of MAY_EXEC vs S_ISREG() test */ inode_permission(inode, MAY_OPEN | acc_mode) security_inode_permission(inode, acc_mode) vfs_open(path, file) do_dentry_open(file, path->dentry->d_inode, open) /* old location of FMODE_EXEC vs S_ISREG() test */ security_file_open(f) open() [1] https://lore.kernel.org/lkml/202006041910.9EF0C602@keescook/Signed-off-by:
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Kees Cook authored
Patch series "Relocate execve() sanity checks", v2. While looking at the code paths for the proposed O_MAYEXEC flag, I saw some things that looked like they should be fixed up. exec: Change uselib(2) IS_SREG() failure to EACCES This just regularizes the return code on uselib(2). exec: Move S_ISREG() check earlier This moves the S_ISREG() check even earlier than it was already. exec: Move path_noexec() check earlier This adds the path_noexec() check to the same place as the S_ISREG() check. This patch (of 3): Change uselib(2)' S_ISREG() error return to EACCES instead of EINVAL so the behavior matches execve(2), and the seemingly documented value. The "not a regular file" failure mode of execve(2) is explicitly documented[1], but it is not mentioned in uselib(2)[2] which does, however, say that open(2) and mmap(2) errors may apply. The documentation for open(2) does not include a "not a regular file" error[3], but mmap(2) does[4], and it is EACCES. [1] http://man7.org/linux/man-pages/man2/execve.2.html#ERRORS [2] http://man7.org/linux/man-pages/man2/uselib.2.html#ERRORS [3] http://man7.org/linux/man-pages/man2/open.2.html#ERRORS [4] http://man7.org/linux/man-pages/man2/mmap.2.html#ERRORSSigned-off-by:
Christian Brauner <christian.brauner@ubuntu.com> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Eric Biggers <ebiggers3@gmail.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Link: http://lkml.kernel.org/r/20200605160013.3954297-1-keescook@chromium.org Link: http://lkml.kernel.org/r/20200605160013.3954297-2-keescook@chromium.orgSigned-off-by:
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Lepton Wu authored
The document reads "%e" should be "executable filename" while actually it could be changed by things like pr_ctl PR_SET_NAME. People who uses "%e" in core_pattern get surprised when they find out they get thread name instead of executable filename. This is either a bug of document or a bug of code. Since the behavior of "%e" is there for long time, it could bring another surprise for users if we "fix" the code. So we just "fix" the document. And more, for users who really need the "executable filename" in core_pattern, we introduce a new "%f" for the real executable filename. We already have "%E" for executable path in kernel, so just reuse most of its code for the new added "%f" format. Signed-off-by:
Lepton Wu <ytht.net@gmail.com> Signed-off-by:
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Tiezhu Yang authored
Reset the member "test_fs" of the test configuration after a call of the function "kfree_const" to a null pointer so that a double memory release will not be performed. Fixes: d9c6a72d ("kmod: add test driver to stress test the module loader") Signed-off-by:
Luis Chamberlain <mcgrof@kernel.org> Signed-off-by:
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Tiezhu Yang authored
There exists redundant "be an" in the comment, remove it. Signed-off-by:
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Tiezhu Yang authored
Patch series "kmod/umh: a few fixes". Tiezhu Yang had sent out a patch set with a slew of kmod selftest fixes, and one patch which modified kmod to return 254 when a module was not found. This opened up pandora's box about why that was being used for and low and behold its because when UMH_WAIT_PROC is used we call a kernel_wait4() call but have never unwrapped the error code. The commit log for that fix details the rationale for the approach taken. I'd appreciate some review on that, in particular nfs folks as it seems a case was never really hit before. This patch (of 5): Use the variable NAME instead of "\000" directly in kmod_test_0001(). Signed-off-by:
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Helge Deller authored
The kernel signalfd4() syscall returns different error codes when called either in compat or native mode. This behaviour makes correct emulation in qemu and testing programs like LTP more complicated. Fix the code to always return -in both modes- EFAULT for unaccessible user memory, and EINVAL when called with an invalid signal mask. Signed-off-by:
Helge Deller <deller@gmx.de> Signed-off-by:
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OGAWA Hirofumi authored
If data clusters == 0, fat_ra_init() calls the ->ent_blocknr() for the cluster beyond ->max_clusters. This checks the limit before initialization to suppress the warning. Reported-by: syzbot+756199124937b31a9b7e@syzkaller.appspotmail.com Signed-off-by:
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by:
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Alexander A. Klimov authored
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `xmlns`: For each link, `http://[^# ]*(?:\w|/)`: If neither `gnu\.org/license`, nor `mozilla\.org/MPL`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by:Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by:
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Yubo Feng authored
There is no need to hold write_lock in fat_ioctl_get_attributes. write_lock may make an impact on concurrency of fat_ioctl_get_attributes. Signed-off-by:
Yubo Feng <fengyubo3@huawei.com> Signed-off-by:
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Colin Ian King authored
The 64 bit ino is being compared to the product of two u32 values, however, the multiplication is being performed using a 32 bit multiply so there is a potential of an overflow. To be fully safe, cast uspi->s_ncg to a u64 to ensure a 64 bit multiplication occurs to avoid any chance of overflow. Fixes: f3e2a520 ("ufs: NFS support") Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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Joe Perches authored
Add macros for nilfs_<level>(sb, fmt, ...) and convert the uses of 'nilfs_msg(sb, KERN_<LEVEL>, ...)' to 'nilfs_<level>(sb, ...)' so nilfs2 uses a logging style more like the typical kernel logging style. Miscellanea: o Realign arguments for these uses Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
Ryusuke Konishi <konishi.ryusuke@gmail.com> Signed-off-by:
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Joe Perches authored
Reduce object size a bit by removing the KERN_<LEVEL> as a separate argument and adding it to the format string. Reduce overall object size by about ~.5% (x86-64 defconfig w/ nilfs2) old: $ size -t fs/nilfs2/built-in.a | tail -1 191738 8676 44 200458 30f0a (TOTALS) new: $ size -t fs/nilfs2/built-in.a | tail -1 190971 8676 44 199691 30c0b (TOTALS) Signed-off-by:
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Eric Biggers authored
Patch series "nilfs2 updates". This patch (of 3): unlock_new_inode() is only meant to be called after a new inode has already been inserted into the hash table. But nilfs_new_inode() can call it even before it has inserted the inode, triggering the WARNING in unlock_new_inode(). Fix this by only calling unlock_new_inode() if the inode has the I_NEW flag set, indicating that it's in the table. Signed-off-by:
Eric Biggers <ebiggers@google.com> Signed-off-by:
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Eric Biggers authored
When truncating a file to a size within the last allowed logical block, block_to_path() is called with the *next* block. This exceeds the limit, causing the "block %ld too big" error message to be printed. This case isn't actually an error; there are just no more blocks past that point. So, remove this error message. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by:
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Eric Biggers authored
The minix filesystem reads its maximum file size from its on-disk superblock. This value isn't necessarily a multiple of the block size. When it's not, the V1 block mapping code doesn't allow mapping the last possible block. Commit 6ed6a722 ("minixfs: fix block limit check") fixed this in the V2 mapping code. Fix it in the V1 mapping code too. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by:
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Eric Biggers authored
The minix filesystem leaves super_block::s_maxbytes at MAX_NON_LFS rather than setting it to the actual filesystem-specific limit. This is broken because it means userspace doesn't see the standard behavior like getting EFBIG and SIGXFSZ when exceeding the maximum file size. Fix this by setting s_maxbytes correctly. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Signed-off-by:
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Eric Biggers authored
If the minix filesystem tries to map a very large logical block number to its on-disk location, block_to_path() can return offsets that are too large, causing out-of-bounds memory accesses when accessing indirect index blocks. This should be prevented by the check against the maximum file size, but this doesn't work because the maximum file size is read directly from the on-disk superblock and isn't validated itself. Fix this by validating the maximum file size at mount time. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Reported-by: syzbot+c7d9ec7a1a7272dd71b3@syzkaller.appspotmail.com Reported-by: syzbot+3b7b03a0c28948054fb5@syzkaller.appspotmail.com Reported-by: syzbot+6e056ee473568865f3e6@syzkaller.appspotmail.com Signed-off-by:
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Eric Biggers authored
If an inode has no links, we need to mark it bad rather than allowing it to be accessed. This avoids WARNINGs in inc_nlink() and drop_nlink() when doing directory operations on a fuzzed filesystem. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Reported-by: syzbot+a9ac3de1b5de5fb10efc@syzkaller.appspotmail.com Reported-by: syzbot+df958cf5688a96ad3287@syzkaller.appspotmail.com Signed-off-by:
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Eric Biggers authored
Patch series "fs/minix: fix syzbot bugs and set s_maxbytes". This series fixes all syzbot bugs in the minix filesystem: KASAN: null-ptr-deref Write in get_block KASAN: use-after-free Write in get_block KASAN: use-after-free Read in get_block WARNING in inc_nlink KMSAN: uninit-value in get_block WARNING in drop_nlink It also fixes the minix filesystem to set s_maxbytes correctly, so that userspace sees the correct behavior when exceeding the max file size. This patch (of 6): sb_getblk() can fail, so check its return value. This fixes a NULL pointer dereference. Originally from Qiujun Huang. Fixes: 1da177e4 ("Linux-2.6.12-rc2") Reported-by: syzbot+4a88b2b9dc280f47baf4@syzkaller.appspotmail.com Signed-off-by:
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Randy Dunlap authored
Change doubled word "is" to "it is". Signed-off-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
Ian Kent <raven@themaw.net> Link: http://lkml.kernel.org/r/5a82befd-40f8-8dc0-3498-cbc0436cad9b@infradead.orgSigned-off-by:
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Joe Perches authored
This test doesn't work well and newer compilers are much better at emitting this warning. Signed-off-by:
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Joe Perches authored
Try to avoid adding repeated words either on the same line or consecutive comment lines in a block e.g.: duplicated word in comment block /* * this is a comment block where the last word of the previous * previous line is also the first word of the next line */ and simple duplication /* test this this again */ Signed-off-by:
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Quentin Monnet authored
Checkpatch reports warnings when some specific structs are not declared as const in the code. The list of structs to consider was initially defined in the checkpatch.pl script itself, but it was later moved to an external file (scripts/const_structs.checkpatch), in commit bf1fa1da ("checkpatch: externalize the structs that should be const"). This introduced two minor issues: - When file scripts/const_structs.checkpatch is not present (for example, if checkpatch is run outside of the kernel directory with the "--no-tree" option), a warning is printed to stderr to tell the user that "No structs that should be const will be found". This is fair, but the warning is printed unconditionally, even if the option "--ignore CONST_STRUCT" is passed. In the latter case, we explicitly ask checkpatch to skip this check, so no warning should be printed. - When scripts/const_structs.checkpatch is missing, or even when trying to silence the warning by adding an empty file, $const_structs is set to "", and the regex used for finding structs that should be const, "$line =~ /struct\s+($const_structs)(?!\s*\{)/)", matches all structs found in the code, thus reporting a number of false positives. Let's fix the first item by skipping scripts/const_structs.checkpatch processing if "CONST_STRUCT" checks are ignored, and the second one by skipping the test if $const_structs is not defined. Since we modify the read_words() function a little bit, update the checks for $typedefsfile/$typeOtherTypedefs as well. Signed-off-by:
Quentin Monnet <quentin@isovalent.com> Signed-off-by:
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Joe Perches authored
Add a --fix option for 2 types of single-line assignment in if statements if ((foo = bar(...)) < BAZ) { expands to: foo = bar(..); if (foo < BAZ) { and if ((foo = bar(...)) { expands to: foo = bar(...); if (foo) { if statements with assignments spanning multiple lines are not converted with the --fix option. if statements with additional logic are also not converted. e.g.: if ((foo = bar(...)) & BAZ == BAZ) { Signed-off-by: -
Joe Perches authored
IS_ENABLED is almost always used with CONFIG_<FOO> defines. Add a test to verify that the #define being tested starts with CONFIG_. Signed-off-by:
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Rikard Falkeborn authored
Add tests of GENMASK and GENMASK_ULL. A few test cases that should fail compilation are provided under #ifdef TEST_GENMASK_FAILURES [rd.dunlap@gmail.com: add MODULE_LICENSE()] Link: http://lkml.kernel.org/r/dfc74524-0789-2827-4eff-476ddab65699@gmail.com [weiyongjun1@huawei.com: make some functions static] Link: http://lkml.kernel.org/r/20200702150336.4756-1-weiyongjun1@huawei.comSuggested-by:
Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by:
Rikard Falkeborn <rikard.falkeborn@gmail.com> Signed-off-by:
Randy Dunlap <rd.dunlap@gmail.com> Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by:
William Breathitt Gray <vilhelm.gray@gmail.com> Cc: Emil Velikov <emil.l.velikov@gmail.com> Cc: Syed Nayyar Waris <syednwaris@gmail.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Link: http://lkml.kernel.org/r/20200621054210.14804-2-rikard.falkeborn@gmail.com Link: http://lkml.kernel.org/r/20200608221823.35799-2-rikard.falkeborn@gmail.comSigned-off-by:
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Kars Mulder authored
The documentation of the kstrto*() functions describes kstrto*() as "replacements" of the "obsolete" simple_strto*() functions. Both of these terms are inaccurate: they're not replacements because they have different behaviour, and the simple_strto*() are not obsolete because there are cases where they have benefits over kstrto*(). Remove usage of the terms "replacement" and "obsolete" in reference to simple_strto*(), and instead use the term "preferred over". Fixes: 4c925d60 ("kstrto*: add documentation") Fixes: 885e68e8 ("kernel.h: update comment about simple_strto<foo>() functions") Signed-off-by:
Kars Mulder <kerneldev@karsmulder.nl> Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Eldad Zack <eldad@fogrefinery.com> Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> Cc: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Mans Rullgard <mans@mansr.com> Cc: Petr Mladek <pmladek@suse.com> Link: http://lkml.kernel.org/r/29b9-5f234c80-13-4e3aa200@244003027Signed-off-by:
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Kars Mulder authored
The documentation of the kstrto*() functions reference the simple_strtoull function by "used as a replacement for [the obsolete] simple_strtoull". All these functions describes themselves as replacements for the function simple_strtoull, even though a function like kstrtol() would be more aptly described as a replacement of simple_strtol(). Fix these references by making the documentation of kstrto*() reference the closest simple_strto*() equivalent available. The functions kstrto[u]int() do not have direct simple_strto[u]int() equivalences, so these are made to refer to simple_strto[u]l() instead. Furthermore, add parentheses after function names, as is standard in kernel documentation. Fixes: 4c925d60 ("kstrto*: add documentation") Signed-off-by:
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Alexander A. Klimov authored
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Signed-off-by:
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Tiezhu Yang authored
Since filp_open() returns an error pointer, we should use IS_ERR() to check the return value and then return PTR_ERR() if failed to get the actual return value instead of always -EINVAL. E.g. without this patch: [root@localhost loongson]# ls no_such_file ls: cannot access no_such_file: No such file or directory [root@localhost loongson]# modprobe test_lockup file_path=no_such_file lock_sb_umount time_secs=60 state=S modprobe: ERROR: could not insert 'test_lockup': Invalid argument [root@localhost loongson]# dmesg | tail -1 [ 126.100596] test_lockup: cannot find file_path With this patch: [root@localhost loongson]# ls no_such_file ls: cannot access no_such_file: No such file or directory [root@localhost loongson]# modprobe test_lockup file_path=no_such_file lock_sb_umount time_secs=60 state=S modprobe: ERROR: could not insert 'test_lockup': Unknown symbol in module, or unknown parameter (see dmesg) [root@localhost loongson]# dmesg | tail -1 [ 95.134362] test_lockup: failed to open no_such_file: -2 Fixes: aecd42df ("lib/test_lockup.c: add parameters for locking generic vfs locks") Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Kees Cook <keescook@chromium.org> Link: http://lkml.kernel.org/r/1595555407-29875-2-git-send-email-yangtiezhu@loongson.cnSigned-off-by:
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Tiezhu Yang authored
Since test_lockup is a test module to generate lockups, it is better to limit TEST_LOCKUP to module (=m) or disabled (=n) because we can not use the module parameters when CONFIG_TEST_LOCKUP=y. Signed-off-by:
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Wei Yongjun authored
Fix sparse build warning: lib/test_lockup.c:403:1: warning: symbol '__pcpu_scope_test_works' was not declared. Should it be static? Reported-by:
Hulk Robot <hulkci@huawei.com> Signed-off-by:
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Geert Uytterhoeven authored
Currently, the bitops test consists of two parts: one part is executed during module load, the second part during module unload. This is cumbersome for the user, as he has to perform two steps to execute all tests, and is different from most (all?) other tests. Merge the two parts, so both are executed during module load. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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