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Diffstat (limited to 'arch/tile/kernel/single_step.c')
-rw-r--r--arch/tile/kernel/single_step.c75
1 files changed, 41 insertions, 34 deletions
diff --git a/arch/tile/kernel/single_step.c b/arch/tile/kernel/single_step.c
index 266aae123632..5ec4b9c651f2 100644
--- a/arch/tile/kernel/single_step.c
+++ b/arch/tile/kernel/single_step.c
@@ -23,6 +23,7 @@
#include <linux/uaccess.h>
#include <linux/mman.h>
#include <linux/types.h>
+#include <linux/err.h>
#include <asm/cacheflush.h>
#include <asm/opcode-tile.h>
#include <asm/opcode_constants.h>
@@ -39,8 +40,8 @@ static int __init setup_unaligned_printk(char *str)
if (strict_strtol(str, 0, &val) != 0)
return 0;
unaligned_printk = val;
- printk("Printk for each unaligned data accesses is %s\n",
- unaligned_printk ? "enabled" : "disabled");
+ pr_info("Printk for each unaligned data accesses is %s\n",
+ unaligned_printk ? "enabled" : "disabled");
return 1;
}
__setup("unaligned_printk=", setup_unaligned_printk);
@@ -113,7 +114,7 @@ static tile_bundle_bits rewrite_load_store_unaligned(
enum mem_op mem_op,
int size, int sign_ext)
{
- unsigned char *addr;
+ unsigned char __user *addr;
int val_reg, addr_reg, err, val;
/* Get address and value registers */
@@ -148,7 +149,7 @@ static tile_bundle_bits rewrite_load_store_unaligned(
return bundle;
/* If it's aligned, don't handle it specially */
- addr = (void *)regs->regs[addr_reg];
+ addr = (void __user *)regs->regs[addr_reg];
if (((unsigned long)addr % size) == 0)
return bundle;
@@ -183,7 +184,7 @@ static tile_bundle_bits rewrite_load_store_unaligned(
siginfo_t info = {
.si_signo = SIGSEGV,
.si_code = SEGV_MAPERR,
- .si_addr = (void __user *)addr
+ .si_addr = addr
};
force_sig_info(info.si_signo, &info, current);
return (tile_bundle_bits) 0;
@@ -193,30 +194,33 @@ static tile_bundle_bits rewrite_load_store_unaligned(
siginfo_t info = {
.si_signo = SIGBUS,
.si_code = BUS_ADRALN,
- .si_addr = (void __user *)addr
+ .si_addr = addr
};
force_sig_info(info.si_signo, &info, current);
return (tile_bundle_bits) 0;
}
if (unaligned_printk || unaligned_fixup_count == 0) {
- printk("Process %d/%s: PC %#lx: Fixup of"
- " unaligned %s at %#lx.\n",
- current->pid, current->comm, regs->pc,
- (mem_op == MEMOP_LOAD || mem_op == MEMOP_LOAD_POSTINCR) ?
- "load" : "store",
- (unsigned long)addr);
+ pr_info("Process %d/%s: PC %#lx: Fixup of"
+ " unaligned %s at %#lx.\n",
+ current->pid, current->comm, regs->pc,
+ (mem_op == MEMOP_LOAD ||
+ mem_op == MEMOP_LOAD_POSTINCR) ?
+ "load" : "store",
+ (unsigned long)addr);
if (!unaligned_printk) {
- printk("\n"
-"Unaligned fixups in the kernel will slow your application considerably.\n"
-"You can find them by writing \"1\" to /proc/sys/tile/unaligned_fixup/printk,\n"
-"which requests the kernel show all unaligned fixups, or writing a \"0\"\n"
-"to /proc/sys/tile/unaligned_fixup/enabled, in which case each unaligned\n"
-"access will become a SIGBUS you can debug. No further warnings will be\n"
-"shown so as to avoid additional slowdown, but you can track the number\n"
-"of fixups performed via /proc/sys/tile/unaligned_fixup/count.\n"
-"Use the tile-addr2line command (see \"info addr2line\") to decode PCs.\n"
- "\n");
+#define P pr_info
+P("\n");
+P("Unaligned fixups in the kernel will slow your application considerably.\n");
+P("To find them, write a \"1\" to /proc/sys/tile/unaligned_fixup/printk,\n");
+P("which requests the kernel show all unaligned fixups, or write a \"0\"\n");
+P("to /proc/sys/tile/unaligned_fixup/enabled, in which case each unaligned\n");
+P("access will become a SIGBUS you can debug. No further warnings will be\n");
+P("shown so as to avoid additional slowdown, but you can track the number\n");
+P("of fixups performed via /proc/sys/tile/unaligned_fixup/count.\n");
+P("Use the tile-addr2line command (see \"info addr2line\") to decode PCs.\n");
+P("\n");
+#undef P
}
}
++unaligned_fixup_count;
@@ -276,7 +280,7 @@ void single_step_once(struct pt_regs *regs)
struct thread_info *info = (void *)current_thread_info();
struct single_step_state *state = info->step_state;
int is_single_step = test_ti_thread_flag(info, TIF_SINGLESTEP);
- tile_bundle_bits *buffer, *pc;
+ tile_bundle_bits __user *buffer, *pc;
tile_bundle_bits bundle;
int temp_reg;
int target_reg = TREG_LR;
@@ -306,21 +310,21 @@ void single_step_once(struct pt_regs *regs)
/* allocate a page of writable, executable memory */
state = kmalloc(sizeof(struct single_step_state), GFP_KERNEL);
if (state == NULL) {
- printk("Out of kernel memory trying to single-step\n");
+ pr_err("Out of kernel memory trying to single-step\n");
return;
}
/* allocate a cache line of writable, executable memory */
down_write(&current->mm->mmap_sem);
- buffer = (void *) do_mmap(0, 0, 64,
+ buffer = (void __user *) do_mmap(NULL, 0, 64,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS,
0);
up_write(&current->mm->mmap_sem);
- if ((int)buffer < 0 && (int)buffer > -PAGE_SIZE) {
+ if (IS_ERR((void __force *)buffer)) {
kfree(state);
- printk("Out of kernel pages trying to single-step\n");
+ pr_err("Out of kernel pages trying to single-step\n");
return;
}
@@ -349,11 +353,14 @@ void single_step_once(struct pt_regs *regs)
if (regs->faultnum == INT_SWINT_1)
regs->pc -= 8;
- pc = (tile_bundle_bits *)(regs->pc);
- bundle = pc[0];
+ pc = (tile_bundle_bits __user *)(regs->pc);
+ if (get_user(bundle, pc) != 0) {
+ pr_err("Couldn't read instruction at %p trying to step\n", pc);
+ return;
+ }
/* We'll follow the instruction with 2 ill op bundles */
- state->orig_pc = (unsigned long) pc;
+ state->orig_pc = (unsigned long)pc;
state->next_pc = (unsigned long)(pc + 1);
state->branch_next_pc = 0;
state->update = 0;
@@ -633,7 +640,7 @@ void single_step_once(struct pt_regs *regs)
}
if (err) {
- printk("Fault when writing to single-step buffer\n");
+ pr_err("Fault when writing to single-step buffer\n");
return;
}
@@ -641,12 +648,12 @@ void single_step_once(struct pt_regs *regs)
* Flush the buffer.
* We do a local flush only, since this is a thread-specific buffer.
*/
- __flush_icache_range((unsigned long) state->buffer,
- (unsigned long) buffer);
+ __flush_icache_range((unsigned long)state->buffer,
+ (unsigned long)buffer);
/* Indicate enabled */
state->is_enabled = is_single_step;
- regs->pc = (unsigned long) state->buffer;
+ regs->pc = (unsigned long)state->buffer;
/* Fault immediately if we are coming back from a syscall. */
if (regs->faultnum == INT_SWINT_1)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.