Re: [PATCH] arm64: kdump: update ppos when reading elfcorehdr
From: Tyler Hicks <hidden>
Date: 2021-03-19 21:08:07
Also in:
lkml
On 2021-03-19 16:50:54, Pavel Tatashin wrote:
The ppos points to a position in the old kernel memory (and in case of arm64 in the crash kernel since elfcorehdr is passed as a segment). The function should update the ppos by the amount that was read. This bug is not exposed by accident, but other platforms update this value properly. So, fix it in ARM64 version of elfcorehdr_read() as well.
Fixes: e62aaeac426a ("arm64: kdump: provide /proc/vmcore file")
Reviewed-by: Tyler Hicks <redacted>
Tyler
quoted hunk ↗ jump to hunk
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com> --- arch/arm64/kernel/crash_dump.c | 2 ++ 1 file changed, 2 insertions(+)diff --git a/arch/arm64/kernel/crash_dump.c b/arch/arm64/kernel/crash_dump.c index e6e284265f19..58303a9ec32c 100644 --- a/arch/arm64/kernel/crash_dump.c +++ b/arch/arm64/kernel/crash_dump.c@@ -64,5 +64,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) { memcpy(buf, phys_to_virt((phys_addr_t)*ppos), count); + *ppos += count; + return count; }-- 2.25.1
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