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target/s390x/arch_dump: Fix memory corruption in s390x_write_elf64_notes() 

"note_size" can be smaller than sizeof(note), so unconditionally calling
memset(notep, 0, sizeof(note)) could cause a memory corruption here in
case notep has been allocated dynamically, thus let's use note_size as
length argument for memset() instead.

Reported-by: Sebastian Mitterle <smitterl@redhat.com>
Fixes: 113d8f4e95 ("s390x: pv: Add dump support")
Message-Id: <20230214141056.680969-1-thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit eb60026120)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Thomas Huth 2023-02-14 15:10:56 +01:00 committed by Michael Tokarev
parent a2efa1fac4
commit a3c6cd83e3
1 changed files with 1 additions and 1 deletions
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target/s390x/arch_dump.c
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@ -248,7 +248,7 @@ static int s390x_write_elf64_notes(const char *note_name,
notep = g_malloc(note_size);
}
memset(notep, 0, sizeof(note));
memset(notep, 0, note_size);
/* Setup note header data */
notep->hdr.n_descsz = cpu_to_be32(content_size);