[PATCH] /proc/kcore: Update physical address for kcore ram and text

From: Pratyush Anand
Date: Tue Jan 24 2017 - 23:45:31 EST


Currently all the p_paddr of PT_LOAD headers are assigned to 0, which is
not true and could be misleading, since 0 is a valid physical address.

User space tools like makedumpfile needs to know physical address for
PT_LOAD segments of direct mapped regions. Therefore this patch updates
paddr for such regions. It also sets an invalid paddr (-1) for other
regions, so that user space tool can know whether a physical address
provided in PT_LOAD is correct or not.

Signed-off-by: Pratyush Anand <panand@xxxxxxxxxx>
---
fs/proc/kcore.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 0b80ad87b4d6..ea9f3d1ae830 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -373,7 +373,10 @@ static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
phdr->p_flags = PF_R|PF_W|PF_X;
phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff;
phdr->p_vaddr = (size_t)m->addr;
- phdr->p_paddr = 0;
+ if (m->type == KCORE_RAM || m->type == KCORE_TEXT)
+ phdr->p_paddr = __pa(m->addr);
+ else
+ phdr->p_paddr = (elf_addr_t)-1;
phdr->p_filesz = phdr->p_memsz = m->size;
phdr->p_align = PAGE_SIZE;
}
--
2.9.3