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authorLianbo Jiang <lijiang@redhat.com>2019-04-30 10:44:21 +0300
committerBorislav Petkov <bp@suse.de>2019-06-20 11:07:49 +0300
commit4eb5fec31e613105668a1472d5876f3d0558e5d8 (patch)
tree380bb041b0998876ca32813062a361751c5fdc5f /fs/proc
parent85784d16c2cf172cf1ebaf2390d6b7c4045d659c (diff)
downloadlinux-4eb5fec31e613105668a1472d5876f3d0558e5d8.tar.xz
fs/proc/vmcore: Enable dumping of encrypted memory when SEV was active
In the kdump kernel, the memory of the first kernel gets to be dumped into a vmcore file. Similarly to SME kdump, if SEV was enabled in the first kernel, the old memory has to be remapped encrypted in order to access it properly. Commit 992b649a3f01 ("kdump, proc/vmcore: Enable kdumping encrypted memory with SME enabled") took care of the SME case but it uses sme_active() which checks for SME only. Use mem_encrypt_active() instead, which returns true when either SME or SEV is active. Unlike SME, the second kernel images (kernel and initrd) are loaded into encrypted memory when SEV is active, hence the kernel elf header must be remapped as encrypted in order to access it properly. [ bp: Massage commit message. ] Co-developed-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Lianbo Jiang <lijiang@redhat.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: bhe@redhat.com Cc: dyoung@redhat.com Cc: Ganesh Goudar <ganeshgr@chelsio.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: kexec@lists.infradead.org Cc: linux-fsdevel@vger.kernel.org Cc: Matthew Wilcox <willy@infradead.org> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: mingo@redhat.com Cc: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com> Cc: Souptick Joarder <jrdr.linux@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190430074421.7852-4-lijiang@redhat.com
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/vmcore.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 7bb96fdd38ad..57957c91c6df 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -166,7 +166,7 @@ void __weak elfcorehdr_free(unsigned long long addr)
*/
ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
{
- return read_from_oldmem(buf, count, ppos, 0, false);
+ return read_from_oldmem(buf, count, ppos, 0, sev_active());
}
/*
@@ -174,7 +174,7 @@ ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
*/
ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
{
- return read_from_oldmem(buf, count, ppos, 0, sme_active());
+ return read_from_oldmem(buf, count, ppos, 0, mem_encrypt_active());
}
/*
@@ -374,7 +374,7 @@ static ssize_t __read_vmcore(char *buffer, size_t buflen, loff_t *fpos,
buflen);
start = m->paddr + *fpos - m->offset;
tmp = read_from_oldmem(buffer, tsz, &start,
- userbuf, sme_active());
+ userbuf, mem_encrypt_active());
if (tmp < 0)
return tmp;
buflen -= tsz;