public inbox for glibc-cvs@sourceware.org help / color / mirror / Atom feed
From: Noah Goldstein <nwg@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] stdlib: Remove attr_write from mbstows if dst is NULL [BZ: 29265] Date: Wed, 22 Jun 2022 18:22:46 +0000 (GMT) [thread overview] Message-ID: <20220622182246.17A033833797@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=464d189b9622932a75302290625de84931656ec0 commit 464d189b9622932a75302290625de84931656ec0 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Wed Jun 22 08:24:21 2022 -0700 stdlib: Remove attr_write from mbstows if dst is NULL [BZ: 29265] mbstows is defined if dst is NULL and is defined to special cased if dst is NULL so the fortify objsize check if incorrect in that case. Tested on x86-64 linux. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Diff: --- stdlib/Makefile | 3 +++ stdlib/bits/stdlib.h | 16 +++++++++++----- stdlib/testmb.c | 7 +++++++ 3 files changed, 21 insertions(+), 5 deletions(-) diff --git a/stdlib/Makefile b/stdlib/Makefile index adbda5f8a5..d4a4d5679a 100644 --- a/stdlib/Makefile +++ b/stdlib/Makefile @@ -373,6 +373,9 @@ CFLAGS-tst-qsort.c += $(stack-align-test-flags) CFLAGS-tst-makecontext.c += -funwind-tables CFLAGS-tst-makecontext2.c += $(stack-align-test-flags) +CFLAGS-testmb.c += -D_FORTIFY_SOURCE=2 -Wall -Werror + + # Run a test on the header files we use. tests-special += $(objpfx)isomac.out diff --git a/stdlib/bits/stdlib.h b/stdlib/bits/stdlib.h index 277d099e22..d9c2d822a5 100644 --- a/stdlib/bits/stdlib.h +++ b/stdlib/bits/stdlib.h @@ -96,6 +96,11 @@ extern size_t __mbstowcs_chk (wchar_t *__restrict __dst, const char *__restrict __src, size_t __len, size_t __dstlen) __THROW __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2)); +extern size_t __REDIRECT_NTH (__mbstowcs_chk_nulldst, + (wchar_t *__restrict __dst, + const char *__restrict __src, + size_t __len), mbstowcs_chk) + __attr_access ((__read_only__, 2)); extern size_t __REDIRECT_NTH (__mbstowcs_alias, (wchar_t *__restrict __dst, const char *__restrict __src, @@ -108,16 +113,17 @@ extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn, __warnattr ("mbstowcs called with dst buffer smaller than len " "* sizeof (wchar_t)"); -__fortify_function size_t +__always_inline __fortify_function size_t __NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src, size_t __len)) { - return __glibc_fortify_n (mbstowcs, __len, sizeof (wchar_t), - __glibc_objsize (__dst), - __dst, __src, __len); + if (__builtin_constant_p (__dst == NULL) && __dst == NULL) + return __mbstowcs_chk_nulldst (__dst, __src, __len); + else + return __glibc_fortify_n (mbstowcs, __len, sizeof (wchar_t), + __glibc_objsize (__dst), __dst, __src, __len); } - extern size_t __wcstombs_chk (char *__restrict __dst, const wchar_t *__restrict __src, size_t __len, size_t __dstlen) __THROW diff --git a/stdlib/testmb.c b/stdlib/testmb.c index 45dae7db61..6ac4dfd21d 100644 --- a/stdlib/testmb.c +++ b/stdlib/testmb.c @@ -16,6 +16,13 @@ main (int argc, char *argv[]) lose = 1; } + i = mbstowcs (NULL, "bar", 4); + if (!(i == 3 && w[1] == 'a')) + { + puts ("mbstowcs FAILED2!"); + lose = 1; + } + mbstowcs (w, "blah", 5); i = wcstombs (c, w, 10); if (i != 4)
reply other threads:[~2022-06-22 18:22 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20220622182246.17A033833797@sourceware.org \ --to=nwg@sourceware.org \ --cc=glibc-cvs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).