Replace the unsafe read-loops used in the MIPS kernel image loading
with our safe read_file() and read_in_full() wrappers.
This should fix random fails in kernel image loading, especially
from pipes and sockets.
Signed-off-by: Andre Przywara <andre.przyw...@arm.com>
---
mips/kvm.c | 35 ++++++++++++++++-------------------
1 file changed, 16 insertions(+), 19 deletions(-)
diff --git a/mips/kvm.c b/mips/kvm.c
index d970ee0..2f0d61b 100644
--- a/mips/kvm.c
+++ b/mips/kvm.c
@@ -169,21 +169,27 @@ static bool load_flat_binary(struct kvm *kvm, int
fd_kernel, const void *buf,
{
void *p;
void *k_start;
- int nr;
+ ssize_t kernel_size;
p = k_start = guest_flat_to_host(kvm, KERNEL_LOAD_ADDR);
memcpy(p, buf, buflen);
p += buflen;
- while ((nr = read(fd_kernel, p, 65536)) > 0)
- p += nr;
+ kernel_size = read_file(fd_kernel, p,
+ kvm->cfg.ram_size - KERNEL_LOAD_ADDR);
+ if (kernel_size == -1) {
+ if (errno == ENOMEM)
+ die("kernel too big for guest memory");
+ else
+ die_perror("kernel read");
+ }
kvm->arch.is64bit = true;
kvm->arch.entry_point = 0xffffffff81000000ull;
- pr_info("Loaded kernel to 0x%x (%ld bytes)", KERNEL_LOAD_ADDR,
- (long int)(p - k_start));
+ pr_info("Loaded kernel to 0x%x (%zd bytes)", KERNEL_LOAD_ADDR,
+ kernel_size);
return true;
}
@@ -199,7 +205,6 @@ static bool kvm__arch_get_elf_64_info(Elf64_Ehdr *ehdr, int
fd_kernel,
struct kvm__arch_elf_info *ei)
{
int i;
- size_t nr;
Elf64_Phdr phdr;
if (ehdr->e_phentsize != sizeof(phdr)) {
@@ -214,8 +219,7 @@ static bool kvm__arch_get_elf_64_info(Elf64_Ehdr *ehdr, int
fd_kernel,
phdr.p_type = PT_NULL;
for (i = 0; i < ehdr->e_phnum; i++) {
- nr = read(fd_kernel, &phdr, sizeof(phdr));
- if (nr != sizeof(phdr)) {
+ if (read_in_full(fd_kernel, &phdr, sizeof(phdr)) !=
sizeof(phdr)) {
pr_info("Couldn't read %d bytes for ELF PHDR.",
(int)sizeof(phdr));
return false;
}
@@ -245,7 +249,6 @@ static bool kvm__arch_get_elf_32_info(Elf32_Ehdr *ehdr, int
fd_kernel,
struct kvm__arch_elf_info *ei)
{
int i;
- size_t nr;
Elf32_Phdr phdr;
if (ehdr->e_phentsize != sizeof(phdr)) {
@@ -260,8 +263,7 @@ static bool kvm__arch_get_elf_32_info(Elf32_Ehdr *ehdr, int
fd_kernel,
phdr.p_type = PT_NULL;
for (i = 0; i < ehdr->e_phnum; i++) {
- nr = read(fd_kernel, &phdr, sizeof(phdr));
- if (nr != sizeof(phdr)) {
+ if (read_in_full(fd_kernel, &phdr, sizeof(phdr)) !=
sizeof(phdr)) {
pr_info("Couldn't read %d bytes for ELF PHDR.",
(int)sizeof(phdr));
return false;
}
@@ -292,7 +294,6 @@ union ElfHeaders {
static bool load_elf_binary(struct kvm *kvm, int fd_kernel,
union ElfHeaders *eh)
{
- size_t nr;
char *p;
struct kvm__arch_elf_info ei;
@@ -331,13 +332,9 @@ static bool load_elf_binary(struct kvm *kvm, int fd_kernel,
pr_info("ELF Loading 0x%lx bytes from 0x%llx to 0x%llx",
(unsigned long)ei.len, (unsigned long long)ei.offset,
(unsigned long long)ei.load_addr);
- do {
- nr = read(fd_kernel, p, ei.len);
- if (nr < 0)
- die_perror("read");
- p += nr;
- ei.len -= nr;
- } while (ei.len);
+
+ if (read_in_full(fd_kernel, p, ei.len) != (ssize_t)ei.len)
+ die_perror("read");
return true;
}
--
2.3.5
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