forked from pool/glibc
031855a0d1
- malloc-overflows.patch: Fix integer overflows in malloc (CVE-2013-4332, bnc#839870) (forwarded request 198716 from Andreas_Schwab) OBS-URL: https://build.opensuse.org/request/show/198717 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/glibc?expand=0&rev=155
61 lines
1.7 KiB
Diff
61 lines
1.7 KiB
Diff
2013-09-11 Will Newton <will.newton@linaro.org>
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[BZ #15857]
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* malloc/malloc.c (__libc_memalign): Check the value of bytes
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does not overflow.
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[BZ #15856]
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* malloc/malloc.c (__libc_valloc): Check the value of bytes
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does not overflow.
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[BZ #15855]
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* malloc/malloc.c (__libc_pvalloc): Check the value of bytes
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does not overflow.
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Index: glibc-2.18/malloc/malloc.c
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===================================================================
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--- glibc-2.18.orig/malloc/malloc.c
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+++ glibc-2.18/malloc/malloc.c
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@@ -3015,6 +3015,13 @@ __libc_memalign(size_t alignment, size_t
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/* Otherwise, ensure that it is at least a minimum chunk size */
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if (alignment < MINSIZE) alignment = MINSIZE;
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+ /* Check for overflow. */
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+ if (bytes > SIZE_MAX - alignment - MINSIZE)
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+ {
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+ __set_errno (ENOMEM);
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+ return 0;
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+ }
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+
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arena_get(ar_ptr, bytes + alignment + MINSIZE);
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if(!ar_ptr)
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return 0;
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@@ -3046,6 +3053,13 @@ __libc_valloc(size_t bytes)
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size_t pagesz = GLRO(dl_pagesize);
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+ /* Check for overflow. */
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+ if (bytes > SIZE_MAX - pagesz - MINSIZE)
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+ {
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+ __set_errno (ENOMEM);
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+ return 0;
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+ }
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+
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void *(*hook) (size_t, size_t, const void *) =
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force_reg (__memalign_hook);
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if (__builtin_expect (hook != NULL, 0))
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@@ -3082,6 +3096,13 @@ __libc_pvalloc(size_t bytes)
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size_t page_mask = GLRO(dl_pagesize) - 1;
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size_t rounded_bytes = (bytes + page_mask) & ~(page_mask);
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+ /* Check for overflow. */
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+ if (bytes > SIZE_MAX - 2*pagesz - MINSIZE)
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+ {
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+ __set_errno (ENOMEM);
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+ return 0;
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+ }
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+
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void *(*hook) (size_t, size_t, const void *) =
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force_reg (__memalign_hook);
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if (__builtin_expect (hook != NULL, 0))
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