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| author | Freya Murphy <freya@freyacat.org> | 2025-04-24 11:32:21 -0400 |
|---|---|---|
| committer | Freya Murphy <freya@freyacat.org> | 2025-04-24 11:32:21 -0400 |
| commit | f9df808fd5e39a2494a5ab3eb90ea71fdc7b187f (patch) | |
| tree | 8e0d9b385d5ebc72494e929cd6853c8f5459d0ab /kernel/lib/backtrace.c | |
| parent | make 0x80 ring3, add kernel mem ctx switch in idt handler (diff) | |
| download | comus-f9df808fd5e39a2494a5ab3eb90ea71fdc7b187f.tar.gz comus-f9df808fd5e39a2494a5ab3eb90ea71fdc7b187f.tar.bz2 comus-f9df808fd5e39a2494a5ab3eb90ea71fdc7b187f.zip | |
only backtrace on valid kernel frames
Diffstat (limited to 'kernel/lib/backtrace.c')
| -rw-r--r-- | kernel/lib/backtrace.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/lib/backtrace.c b/kernel/lib/backtrace.c index 485cc0f..102e775 100644 --- a/kernel/lib/backtrace.c +++ b/kernel/lib/backtrace.c @@ -6,6 +6,11 @@ struct stackframe { void *rip; }; +extern char kern_stack_start[]; +extern char kern_stack_end[]; + +#define VALID(frame) (frame && (char*)(frame) >= kern_stack_start && ((char*)(frame) <= kern_stack_end)) + size_t backtrace(void **dst, size_t len) { struct stackframe *rbp; @@ -17,11 +22,13 @@ size_t backtrace_ex(void **dst, size_t len, void *ip, void *bp) { struct stackframe *frame = bp; __asm__("mov %%rbp, %0" : "=r"(frame)); + if (!VALID(frame)) + return 0; if (len > 0) { dst[0] = ip; } size_t i; - for (i = 1; frame && i < len; i++) { + for (i = 1; VALID(frame) && i < len; i++) { dst[i] = frame->rip; frame = frame->rbp; } @@ -38,9 +45,11 @@ void log_backtrace(void) void log_backtrace_ex(void *ip, void *bp) { struct stackframe *frame = bp; + if (!VALID(frame)) + return; kputs("Stack trace:\n"); kprintf(" %p\t%s\n", ip, mboot_get_elf_sym((uint64_t)ip)); - while (frame) { + while (VALID(frame)) { kprintf(" %p\t%s\n", frame->rip, mboot_get_elf_sym((uint64_t)frame->rip)); frame = frame->rbp; |