86 lines
2.9 KiB
Diff
86 lines
2.9 KiB
Diff
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commit a88f07f71f051021339682328103a8c75559fc5f
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Author: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Wed Jun 22 08:24:21 2022 -0700
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stdlib: Remove attr_write from mbstows if dst is NULL [BZ: 29265]
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mbstows is defined if dst is NULL and is defined to special cased if
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dst is NULL so the fortify objsize check if incorrect in that case.
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Tested on x86-64 linux.
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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(cherry picked from commit 464d189b9622932a75302290625de84931656ec0)
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diff --git a/stdlib/Makefile b/stdlib/Makefile
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index a4ac30d1f6359561..e13f1ee33c410ae6 100644
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--- a/stdlib/Makefile
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+++ b/stdlib/Makefile
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@@ -217,6 +217,9 @@ CFLAGS-tst-qsort.c += $(stack-align-test-flags)
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CFLAGS-tst-makecontext.c += -funwind-tables
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CFLAGS-tst-makecontext2.c += $(stack-align-test-flags)
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+CFLAGS-testmb.c += -D_FORTIFY_SOURCE=2 -Wall -Werror
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+
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+
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# Run a test on the header files we use.
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tests-special += $(objpfx)isomac.out
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diff --git a/stdlib/bits/stdlib.h b/stdlib/bits/stdlib.h
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index ccacbdf76a08225a..f0918d5d798a6ac4 100644
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--- a/stdlib/bits/stdlib.h
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+++ b/stdlib/bits/stdlib.h
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@@ -96,6 +96,11 @@ extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
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const char *__restrict __src,
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size_t __len, size_t __dstlen) __THROW
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__attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
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+extern size_t __REDIRECT_NTH (__mbstowcs_chk_nulldst,
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+ (wchar_t *__restrict __dst,
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+ const char *__restrict __src,
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+ size_t __len), mbstowcs_chk)
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+ __attr_access ((__read_only__, 2));
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extern size_t __REDIRECT_NTH (__mbstowcs_alias,
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(wchar_t *__restrict __dst,
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const char *__restrict __src,
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@@ -108,16 +113,17 @@ extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
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__warnattr ("mbstowcs called with dst buffer smaller than len "
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"* sizeof (wchar_t)");
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-__fortify_function size_t
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+__always_inline __fortify_function size_t
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__NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src,
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size_t __len))
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{
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- return __glibc_fortify_n (mbstowcs, __len, sizeof (wchar_t),
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- __glibc_objsize (__dst),
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- __dst, __src, __len);
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+ if (__builtin_constant_p (__dst == NULL) && __dst == NULL)
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+ return __mbstowcs_chk_nulldst (__dst, __src, __len);
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+ else
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+ return __glibc_fortify_n (mbstowcs, __len, sizeof (wchar_t),
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+ __glibc_objsize (__dst), __dst, __src, __len);
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}
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-
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extern size_t __wcstombs_chk (char *__restrict __dst,
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const wchar_t *__restrict __src,
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size_t __len, size_t __dstlen) __THROW
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diff --git a/stdlib/testmb.c b/stdlib/testmb.c
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index 45dae7db61fb3e7b..6ac4dfd21d2d33b8 100644
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--- a/stdlib/testmb.c
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+++ b/stdlib/testmb.c
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@@ -16,6 +16,13 @@ main (int argc, char *argv[])
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lose = 1;
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}
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+ i = mbstowcs (NULL, "bar", 4);
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+ if (!(i == 3 && w[1] == 'a'))
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+ {
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+ puts ("mbstowcs FAILED2!");
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+ lose = 1;
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+ }
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+
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mbstowcs (w, "blah", 5);
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i = wcstombs (c, w, 10);
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if (i != 4)
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