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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:35:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:31 +0000
commit85c675d0d09a45a135bddd15d7b385f8758c32fb (patch)
tree76267dbc9b9a130337be3640948fe397b04ac629 /arch/powerpc/net
parentAdding upstream version 6.6.15. (diff)
downloadlinux-85c675d0d09a45a135bddd15d7b385f8758c32fb.tar.xz
linux-85c675d0d09a45a135bddd15d7b385f8758c32fb.zip
Adding upstream version 6.7.7.upstream/6.7.7
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/net')
-rw-r--r--arch/powerpc/net/bpf_jit.h18
-rw-r--r--arch/powerpc/net/bpf_jit_comp.c149
-rw-r--r--arch/powerpc/net/bpf_jit_comp32.c15
-rw-r--r--arch/powerpc/net/bpf_jit_comp64.c10
4 files changed, 135 insertions, 57 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index 72b7bb34fa..cdea5dccae 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -36,9 +36,6 @@
EMIT(PPC_RAW_BRANCH(offset)); \
} while (0)
-/* bl (unconditional 'branch' with link) */
-#define PPC_BL(dest) EMIT(PPC_RAW_BL((dest) - (unsigned long)(image + ctx->idx)))
-
/* "cond" here covers BO:BI fields. */
#define PPC_BCC_SHORT(cond, dest) \
do { \
@@ -147,12 +144,6 @@ struct codegen_context {
#define BPF_FIXUP_LEN 2 /* Two instructions => 8 bytes */
#endif
-static inline void bpf_flush_icache(void *start, void *end)
-{
- smp_wmb(); /* smp write barrier */
- flush_icache_range((unsigned long)start, (unsigned long)end);
-}
-
static inline bool bpf_is_seen_register(struct codegen_context *ctx, int i)
{
return ctx->seen & (1 << (31 - i));
@@ -169,16 +160,17 @@ static inline void bpf_clear_seen_register(struct codegen_context *ctx, int i)
}
void bpf_jit_init_reg_mapping(struct codegen_context *ctx);
-int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func);
-int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx,
+int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func);
+int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx,
u32 *addrs, int pass, bool extra_pass);
void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx);
void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx);
void bpf_jit_realloc_regs(struct codegen_context *ctx);
int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr);
-int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct codegen_context *ctx,
- int insn_idx, int jmp_off, int dst_reg);
+int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass,
+ struct codegen_context *ctx, int insn_idx,
+ int jmp_off, int dst_reg);
#endif
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index 37043dfc1a..0f9a217833 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -13,9 +13,13 @@
#include <linux/netdevice.h>
#include <linux/filter.h>
#include <linux/if_vlan.h>
-#include <asm/kprobes.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
#include <linux/bpf.h>
+#include <asm/kprobes.h>
+#include <asm/code-patching.h>
+
#include "bpf_jit.h"
static void bpf_jit_fill_ill_insns(void *area, unsigned int size)
@@ -39,10 +43,13 @@ int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg,
return 0;
}
-struct powerpc64_jit_data {
- struct bpf_binary_header *header;
+struct powerpc_jit_data {
+ /* address of rw header */
+ struct bpf_binary_header *hdr;
+ /* address of ro final header */
+ struct bpf_binary_header *fhdr;
u32 *addrs;
- u8 *image;
+ u8 *fimage;
u32 proglen;
struct codegen_context ctx;
};
@@ -59,15 +66,18 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
u8 *image = NULL;
u32 *code_base;
u32 *addrs;
- struct powerpc64_jit_data *jit_data;
+ struct powerpc_jit_data *jit_data;
struct codegen_context cgctx;
int pass;
int flen;
- struct bpf_binary_header *bpf_hdr;
+ struct bpf_binary_header *fhdr = NULL;
+ struct bpf_binary_header *hdr = NULL;
struct bpf_prog *org_fp = fp;
struct bpf_prog *tmp_fp;
bool bpf_blinded = false;
bool extra_pass = false;
+ u8 *fimage = NULL;
+ u32 *fcode_base;
u32 extable_len;
u32 fixup_len;
@@ -97,9 +107,16 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
addrs = jit_data->addrs;
if (addrs) {
cgctx = jit_data->ctx;
- image = jit_data->image;
- bpf_hdr = jit_data->header;
+ /*
+ * JIT compiled to a writable location (image/code_base) first.
+ * It is then moved to the readonly final location (fimage/fcode_base)
+ * using instruction patching.
+ */
+ fimage = jit_data->fimage;
+ fhdr = jit_data->fhdr;
proglen = jit_data->proglen;
+ hdr = jit_data->hdr;
+ image = (void *)hdr + ((void *)fimage - (void *)fhdr);
extra_pass = true;
/* During extra pass, ensure index is reset before repopulating extable entries */
cgctx.exentry_idx = 0;
@@ -119,7 +136,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
cgctx.stack_size = round_up(fp->aux->stack_depth, 16);
/* Scouting faux-generate pass 0 */
- if (bpf_jit_build_body(fp, 0, &cgctx, addrs, 0, false)) {
+ if (bpf_jit_build_body(fp, NULL, NULL, &cgctx, addrs, 0, false)) {
/* We hit something illegal or unsupported. */
fp = org_fp;
goto out_addrs;
@@ -134,7 +151,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
*/
if (cgctx.seen & SEEN_TAILCALL || !is_offset_in_branch_range((long)cgctx.idx * 4)) {
cgctx.idx = 0;
- if (bpf_jit_build_body(fp, 0, &cgctx, addrs, 0, false)) {
+ if (bpf_jit_build_body(fp, NULL, NULL, &cgctx, addrs, 0, false)) {
fp = org_fp;
goto out_addrs;
}
@@ -146,9 +163,9 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
* update ctgtx.idx as it pretends to output instructions, then we can
* calculate total size from idx.
*/
- bpf_jit_build_prologue(0, &cgctx);
+ bpf_jit_build_prologue(NULL, &cgctx);
addrs[fp->len] = cgctx.idx * 4;
- bpf_jit_build_epilogue(0, &cgctx);
+ bpf_jit_build_epilogue(NULL, &cgctx);
fixup_len = fp->aux->num_exentries * BPF_FIXUP_LEN * 4;
extable_len = fp->aux->num_exentries * sizeof(struct exception_table_entry);
@@ -156,17 +173,19 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
proglen = cgctx.idx * 4;
alloclen = proglen + FUNCTION_DESCR_SIZE + fixup_len + extable_len;
- bpf_hdr = bpf_jit_binary_alloc(alloclen, &image, 4, bpf_jit_fill_ill_insns);
- if (!bpf_hdr) {
+ fhdr = bpf_jit_binary_pack_alloc(alloclen, &fimage, 4, &hdr, &image,
+ bpf_jit_fill_ill_insns);
+ if (!fhdr) {
fp = org_fp;
goto out_addrs;
}
if (extable_len)
- fp->aux->extable = (void *)image + FUNCTION_DESCR_SIZE + proglen + fixup_len;
+ fp->aux->extable = (void *)fimage + FUNCTION_DESCR_SIZE + proglen + fixup_len;
skip_init_ctx:
code_base = (u32 *)(image + FUNCTION_DESCR_SIZE);
+ fcode_base = (u32 *)(fimage + FUNCTION_DESCR_SIZE);
/* Code generation passes 1-2 */
for (pass = 1; pass < 3; pass++) {
@@ -174,8 +193,10 @@ skip_init_ctx:
cgctx.idx = 0;
cgctx.alt_exit_addr = 0;
bpf_jit_build_prologue(code_base, &cgctx);
- if (bpf_jit_build_body(fp, code_base, &cgctx, addrs, pass, extra_pass)) {
- bpf_jit_binary_free(bpf_hdr);
+ if (bpf_jit_build_body(fp, code_base, fcode_base, &cgctx, addrs, pass,
+ extra_pass)) {
+ bpf_arch_text_copy(&fhdr->size, &hdr->size, sizeof(hdr->size));
+ bpf_jit_binary_pack_free(fhdr, hdr);
fp = org_fp;
goto out_addrs;
}
@@ -195,17 +216,19 @@ skip_init_ctx:
#ifdef CONFIG_PPC64_ELF_ABI_V1
/* Function descriptor nastiness: Address + TOC */
- ((u64 *)image)[0] = (u64)code_base;
+ ((u64 *)image)[0] = (u64)fcode_base;
((u64 *)image)[1] = local_paca->kernel_toc;
#endif
- fp->bpf_func = (void *)image;
+ fp->bpf_func = (void *)fimage;
fp->jited = 1;
fp->jited_len = proglen + FUNCTION_DESCR_SIZE;
- bpf_flush_icache(bpf_hdr, (u8 *)bpf_hdr + bpf_hdr->size);
if (!fp->is_func || extra_pass) {
- bpf_jit_binary_lock_ro(bpf_hdr);
+ if (bpf_jit_binary_pack_finalize(fp, fhdr, hdr)) {
+ fp = org_fp;
+ goto out_addrs;
+ }
bpf_prog_fill_jited_linfo(fp, addrs);
out_addrs:
kfree(addrs);
@@ -215,8 +238,9 @@ out_addrs:
jit_data->addrs = addrs;
jit_data->ctx = cgctx;
jit_data->proglen = proglen;
- jit_data->image = image;
- jit_data->header = bpf_hdr;
+ jit_data->fimage = fimage;
+ jit_data->fhdr = fhdr;
+ jit_data->hdr = hdr;
}
out:
@@ -230,12 +254,13 @@ out:
* The caller should check for (BPF_MODE(code) == BPF_PROBE_MEM) before calling
* this function, as this only applies to BPF_PROBE_MEM, for now.
*/
-int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct codegen_context *ctx,
- int insn_idx, int jmp_off, int dst_reg)
+int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, u32 *fimage, int pass,
+ struct codegen_context *ctx, int insn_idx, int jmp_off,
+ int dst_reg)
{
off_t offset;
unsigned long pc;
- struct exception_table_entry *ex;
+ struct exception_table_entry *ex, *ex_entry;
u32 *fixup;
/* Populate extable entries only in the last pass */
@@ -246,9 +271,16 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct code
WARN_ON_ONCE(ctx->exentry_idx >= fp->aux->num_exentries))
return -EINVAL;
+ /*
+ * Program is first written to image before copying to the
+ * final location (fimage). Accordingly, update in the image first.
+ * As all offsets used are relative, copying as is to the
+ * final location should be alright.
+ */
pc = (unsigned long)&image[insn_idx];
+ ex = (void *)fp->aux->extable - (void *)fimage + (void *)image;
- fixup = (void *)fp->aux->extable -
+ fixup = (void *)ex -
(fp->aux->num_exentries * BPF_FIXUP_LEN * 4) +
(ctx->exentry_idx * BPF_FIXUP_LEN * 4);
@@ -259,18 +291,71 @@ int bpf_add_extable_entry(struct bpf_prog *fp, u32 *image, int pass, struct code
fixup[BPF_FIXUP_LEN - 1] =
PPC_RAW_BRANCH((long)(pc + jmp_off) - (long)&fixup[BPF_FIXUP_LEN - 1]);
- ex = &fp->aux->extable[ctx->exentry_idx];
+ ex_entry = &ex[ctx->exentry_idx];
- offset = pc - (long)&ex->insn;
+ offset = pc - (long)&ex_entry->insn;
if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN))
return -ERANGE;
- ex->insn = offset;
+ ex_entry->insn = offset;
- offset = (long)fixup - (long)&ex->fixup;
+ offset = (long)fixup - (long)&ex_entry->fixup;
if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN))
return -ERANGE;
- ex->fixup = offset;
+ ex_entry->fixup = offset;
ctx->exentry_idx++;
return 0;
}
+
+void *bpf_arch_text_copy(void *dst, void *src, size_t len)
+{
+ int err;
+
+ if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst)))
+ return ERR_PTR(-EINVAL);
+
+ mutex_lock(&text_mutex);
+ err = patch_instructions(dst, src, len, false);
+ mutex_unlock(&text_mutex);
+
+ return err ? ERR_PTR(err) : dst;
+}
+
+int bpf_arch_text_invalidate(void *dst, size_t len)
+{
+ u32 insn = BREAKPOINT_INSTRUCTION;
+ int ret;
+
+ if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst)))
+ return -EINVAL;
+
+ mutex_lock(&text_mutex);
+ ret = patch_instructions(dst, &insn, len, true);
+ mutex_unlock(&text_mutex);
+
+ return ret;
+}
+
+void bpf_jit_free(struct bpf_prog *fp)
+{
+ if (fp->jited) {
+ struct powerpc_jit_data *jit_data = fp->aux->jit_data;
+ struct bpf_binary_header *hdr;
+
+ /*
+ * If we fail the final pass of JIT (from jit_subprogs),
+ * the program may not be finalized yet. Call finalize here
+ * before freeing it.
+ */
+ if (jit_data) {
+ bpf_jit_binary_pack_finalize(fp, jit_data->fhdr, jit_data->hdr);
+ kvfree(jit_data->addrs);
+ kfree(jit_data);
+ }
+ hdr = bpf_jit_binary_pack_hdr(fp);
+ bpf_jit_binary_pack_free(hdr, NULL);
+ WARN_ON_ONCE(!bpf_prog_kallsyms_verify_off(fp));
+ }
+
+ bpf_prog_unlock_free(fp);
+}
diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c
index 7f91ea064c..2f39c50ca7 100644
--- a/arch/powerpc/net/bpf_jit_comp32.c
+++ b/arch/powerpc/net/bpf_jit_comp32.c
@@ -200,12 +200,13 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)
EMIT(PPC_RAW_BLR());
}
-int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func)
+/* Relative offset needs to be calculated based on final image location */
+int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func)
{
- s32 rel = (s32)func - (s32)(image + ctx->idx);
+ s32 rel = (s32)func - (s32)(fimage + ctx->idx);
if (image && rel < 0x2000000 && rel >= -0x2000000) {
- PPC_BL(func);
+ EMIT(PPC_RAW_BL(rel));
} else {
/* Load function address into r0 */
EMIT(PPC_RAW_LIS(_R0, IMM_H(func)));
@@ -278,7 +279,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o
}
/* Assemble the body code between the prologue & epilogue */
-int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx,
+int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx,
u32 *addrs, int pass, bool extra_pass)
{
const struct bpf_insn *insn = fp->insnsi;
@@ -940,7 +941,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
* !fp->aux->verifier_zext. Emit NOP otherwise.
*
* Note that "li reg_h,0" is emitted for BPF_B/H/W case,
- * if necessary. So, jump there insted of emitting an
+ * if necessary. So, jump there instead of emitting an
* additional "li reg_h,0" instruction.
*/
if (size == BPF_DW && !fp->aux->verifier_zext)
@@ -997,7 +998,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
jmp_off += 4;
}
- ret = bpf_add_extable_entry(fp, image, pass, ctx, insn_idx,
+ ret = bpf_add_extable_entry(fp, image, fimage, pass, ctx, insn_idx,
jmp_off, dst_reg);
if (ret)
return ret;
@@ -1053,7 +1054,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
EMIT(PPC_RAW_STW(bpf_to_ppc(BPF_REG_5), _R1, 12));
}
- ret = bpf_jit_emit_func_call_rel(image, ctx, func_addr);
+ ret = bpf_jit_emit_func_call_rel(image, fimage, ctx, func_addr);
if (ret)
return ret;
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 0f8048f6da..79f23974a3 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -240,7 +240,7 @@ static int bpf_jit_emit_func_call_hlp(u32 *image, struct codegen_context *ctx, u
return 0;
}
-int bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func)
+int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func)
{
unsigned int i, ctx_idx = ctx->idx;
@@ -361,7 +361,7 @@ asm (
);
/* Assemble the body code between the prologue & epilogue */
-int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx,
+int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx,
u32 *addrs, int pass, bool extra_pass)
{
enum stf_barrier_type stf_barrier = stf_barrier_type_get();
@@ -940,8 +940,8 @@ emit_clear:
addrs[++i] = ctx->idx * 4;
if (BPF_MODE(code) == BPF_PROBE_MEM) {
- ret = bpf_add_extable_entry(fp, image, pass, ctx, ctx->idx - 1,
- 4, dst_reg);
+ ret = bpf_add_extable_entry(fp, image, fimage, pass, ctx,
+ ctx->idx - 1, 4, dst_reg);
if (ret)
return ret;
}
@@ -995,7 +995,7 @@ emit_clear:
if (func_addr_fixed)
ret = bpf_jit_emit_func_call_hlp(image, ctx, func_addr);
else
- ret = bpf_jit_emit_func_call_rel(image, ctx, func_addr);
+ ret = bpf_jit_emit_func_call_rel(image, fimage, ctx, func_addr);
if (ret)
return ret;