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Fix underallocation of abort_msg_s struct (CVE-2025-0395)

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Include the space needed to store the length of the message itself, in
addition to the message string.  This resolves BZ #32582.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Siddhesh Poyarekar
2025-01-21 16:11:06 -05:00
parent d4626340b9
commit 68ee0f704c
2 changed files with 6 additions and 2 deletions
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4
sysdeps/posix/libc_fatal.c
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@@ -20,6 +20,7 @@
#include <errno.h>
#include <fcntl.h>
#include <ldsodefs.h>
#include <libc-pointer-arith.h>
#include <paths.h>
#include <stdarg.h>
#include <stdbool.h>
@@ -105,7 +106,8 @@ __libc_message_impl (const char *fmt, ...)
{
WRITEV_FOR_FATAL (fd, iov, iovcnt, total);
total = (total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
total = ALIGN_UP (total + sizeof (struct abort_msg_s) + 1,
GLRO(dl_pagesize));
struct abort_msg_s *buf = __mmap (NULL, total,
PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);