MIPS: fix FP mode selection in lieu of .MIPS.abiflags data

Commit 46490b572544 ("MIPS: kernel: elf: Improve the overall ABI and FPU
mode checks") reworked the ELF FP ABI mode selection logic, but when
CONFIG_MIPS_O32_FP64_SUPPORT is enabled it breaks the use of binaries
which have no PT_MIPS_ABIFLAGS program header & associated
.MIPS.abiflags section.

A default mode is selected based upon whether the ELF contains MIPS32 or
MIPS64 code, but that selection is made in arch_elf_pt_proc.
arch_elf_pt_proc only executes when a PT_MIPS_ABIFLAGS program header is
found. If one is not found then arch_elf_pt_proc is never called, and no
default overall_fp_mode value is selected. When arch_check_elf is
called, both abi0 & abi1 are MIPS_ABI_FP_UNKNOWN which leads to both
prog_req & interp_req being set to none_req. none_req matches none of
the conditions for mode selection at the end of arch_check_elf, so
overall_fp_mode is left untouched. Finally once mips_set_personality_fp
is called the BUG() in the default case is then hit & the kernel likely
panics.

Fix this by moving the selection of a default overall mode to the start
of arch_check_elf, which runs once per ELF executed regardless of
whether it has a PT_MIPS_ABIFLAGS program header.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org # v4.0+
Patchwork: http://patchwork.linux-mips.org/patch/9978/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 17 insertions, 15 deletions

diff --git a/arch/mips/kernel/elf.c b/arch/mips/kernel/elf.c
index be4899f3c393..4a4d9e067c89 100644
--- a/arch/mips/kernel/elf.c
+++ b/arch/mips/kernel/elf.c
@@ -76,14 +76,6 @@ int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
 
         /* Lets see if this is an O32 ELF */
         if (ehdr32->e_ident[EI_CLASS] == ELFCLASS32) {
-                /* FR = 1 for N32 */
-                if (ehdr32->e_flags & EF_MIPS_ABI2)
-                        state->overall_fp_mode = FP_FR1;
-                else
-                        /* Set a good default FPU mode for O32 */
-                        state->overall_fp_mode = cpu_has_mips_r6 ?
-                                FP_FRE : FP_FR0;
-
                 if (ehdr32->e_flags & EF_MIPS_FP64) {
                         /*
                          * Set MIPS_ABI_FP_OLD_64 for EF_MIPS_FP64. We will override it
@@ -104,9 +96,6 @@ int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
                                   (char *)&abiflags,
                                   sizeof(abiflags));
         } else {
-                /* FR=1 is really the only option for 64-bit */
-                state->overall_fp_mode = FP_FR1;
-
                 if (phdr64->p_type != PT_MIPS_ABIFLAGS)
                         return 0;
                 if (phdr64->p_filesz < sizeof(abiflags))
@@ -137,6 +126,7 @@ int arch_check_elf(void *_ehdr, bool has_interpreter,
         struct elf32_hdr *ehdr = _ehdr;
         struct mode_req prog_req, interp_req;
         int fp_abi, interp_fp_abi, abi0, abi1, max_abi;
+        bool is_mips64;
 
         if (!config_enabled(CONFIG_MIPS_O32_FP64_SUPPORT))
                 return 0;
@@ -152,10 +142,22 @@ int arch_check_elf(void *_ehdr, bool has_interpreter,
                 abi0 = abi1 = fp_abi;
         }
 
-        /* ABI limits. O32 = FP_64A, N32/N64 = FP_SOFT */
-        max_abi = ((ehdr->e_ident[EI_CLASS] == ELFCLASS32) &&
-                   (!(ehdr->e_flags & EF_MIPS_ABI2))) ?
-                MIPS_ABI_FP_64A : MIPS_ABI_FP_SOFT;
+        is_mips64 = (ehdr->e_ident[EI_CLASS] == ELFCLASS64) ||
+                    (ehdr->e_flags & EF_MIPS_ABI2);
+
+        if (is_mips64) {
+                /* MIPS64 code always uses FR=1, thus the default is easy */
+                state->overall_fp_mode = FP_FR1;
+
+                /* Disallow access to the various FPXX & FP64 ABIs */
+                max_abi = MIPS_ABI_FP_SOFT;
+        } else {
+                /* Default to a mode capable of running code expecting FR=0 */
+                state->overall_fp_mode = cpu_has_mips_r6 ? FP_FRE : FP_FR0;
+
+                /* Allow all ABIs we know about */
+                max_abi = MIPS_ABI_FP_64A;
+        }
 
         if ((abi0 > max_abi && abi0 != MIPS_ABI_FP_UNKNOWN) ||
             (abi1 > max_abi && abi1 != MIPS_ABI_FP_UNKNOWN))